USB DIO High Voltage and Relay
USB-PDISO8, USB-ERB, and USB-SSR Series
Features
• USB-PDISO8 Series
− 8 Form C relays
− 8 isolated AC or DC inputs
• USB-ERB Series
USB-PDISO8 Series
USB-ERB Series
− 8 or 24 Form C singlepole double-throw (SPDT)
electromechanical relays.
USB-SSR Series
Overview
• USB-SSR Series
− 8 or 24 input or output
channels to control and
monitor solid state relays.
Measurement Computing DIO high voltage and relay USB product offerings include
the USB-PDISO8 Series, USB-ERB Series, and USB-SSR Series.
The USB-PDISO8 Series offers eight isolated AC or DC inputs and eight electromechanical relays in a single digital I/O system. The USB-ERB Series enables a PC
or laptop to control eight to 24 electromechanical relays.
• Screw terminal or header
connectors
The USB-SSR Series can monitor and control eight to 24 standard size solid state
relay (SSR) I/O modules (relays sold separately).
• Heavy-duty chassis with
integrated mounting slots
All devices in these series come in a heavy-duty metal enclosure with integrated
mounting slots, which ensures that the devices are rugged enough for any DAQ
application.
• Includes external power supply
(required for all devices)
Relay Contacts and
Connectors
SSR Digital I/O Control
Modules
USB-PDISO8/USB-ERB Series Only
USB-SSR Series Only
The USB-PDISO8 and USB-ERB Series
devices provide screw terminal connections to the relay contacts. The
USB-PDISO8/40 provides relay connections through a 40 pin connector.
Each relay has a normally closed (NC),
common (C), and normally open (NO)
contact. Relays on all devices are controlled by digital I/O lines.
Supported Operating Systems
• Windows 11/10/8/7/Vista®/XP
32/64‑bit
• Linux®
The USB-SSR08 provides mounting locations for eight SSR digital I/O modules,
and the USB-SSR24 provides mounting
locations for 24 SSR modules.
The SSR modules use a standard color
scheme to help quickly identify the module type installed.
SSR digital I/O modules are relay control modules that provide 4000 Vrms of
optical isolation. Digital input modules
sense AC/DC voltages from field devices
and convert them to digital TTL signals.
Digital output modules use TTL signals to
switch and control AC/DC loads.
A wide selection of SSR digital I/O
modules are available to switch or sense a
large range of AC or DC voltages.
Compatible SSR modules are available separately (refer to SSR Digital I/O Modules on
page 10).
USB-PDISO8 Series, USB-ERB Series, and USB-SSR Series Selection Chart
Model
Relay Channels
Contact Rating
Daisy Chain Support*
Signal I/O Connector
USB-PDISO8
8 Form C (SPDT)
6 amps at 240 VAC/28 VDC
✔
40-pin screw terminal
USB-PDISO8/40
8 Form C (SPDT)
6 amps at 240 VAC/28 VDC
✔
40-pin header connector
USB-ERB08
8 Form C (SPDT)
6 amps at 240 VAC/28 VDC
✔
24-pin screw terminal
USB-ERB24
24 Form C (SPDT)
6 amps at 240 VAC/28 VDC
✔
72-pin screw terminal
USB-SSR08
8 Solid State Relay Modules
–
✔
16-pin screw terminal
USB-SSR24
24 Solid State Relay Modules
–
✔
48-pin screw terminal
* Use standard/included USB cable for communications daisy chain; user-supplied custom cable required for power daisy chain
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USB DIO High Voltage and Relay
Features
Daisy Chaining Multiple Devices
I/O Module Type Switch
USB-SSR Series devices have an onboard switch to configure
each module group for either input or output.
MCC high-voltage/relay DIO devices can be optionally daisy
chained to connect to the USB bus through the high-speed hub
on the host device. Up to four MCC USB devices can be daisy
chained to a single USB port on the PC using the standard/
included USB cables.
Devices are shipped with all modules configured for output.
Input and output modules cannot be mixed within a group.
Positive and negative relay contacts are brought out to screw
terminals for field wiring connections.
Make sure adequate power is provided to each connected device.
You can use an independent power supply for each device, or
connect a user-supplied custom cable to daisy chain power.
Relay Configuration Switches
USB‑ERB/USB-SSR Series Only
Voltage Drop
Devices are shipped with all relay banks/module groups configured for non-inverted logic and pull-up (relays/modules inactive
on power-up).
Supply Current
A drop in voltage occurs with each device connected in a daisy
chain configuration. The voltage drop between the power supply
input and the daisy chain output is 0.5 V maximum. Factor in
this voltage drop when configuring a daisy chain system to ensure
that at least 6.0 VDC is provided to the last device in the chain.
USB-SSR Series and USB-ERB Series devices have two onboard
switches for configuring the relay logic polarity and output relay
power-up state for each relay bank/SSR module group. The current configuration of each switch can be read back with software.
The following devices may require addition external power
adapters depending on the number of connected devices:
Differential Isolated Digital Inputs
USB-PDISO8 Series Only
All eight inputs on USB-PDISO8 Series devices can be driven by
either AC (50 Hz to 1000 Hz) or DC voltage, and can be read
back as a single byte.
Each input has a software-selectable filter with a time constant
of 5 ms (200 Hz). The filter is required for AC inputs, and recommended for most DC inputs.
Each module group can be set to either input or output (default).
Input and output modules cannot be mixed within a group.
Device
External Power Consumption
(All Relays/SSR Modules On)
USB-PDISO8 Series
Draws 820 mA from the 1.67 A supply
USB-ERB08
Draws 750 mA from the 1.67 A supply
USB-ERB24
Draws 1.5 A from 3 A supply
USB-SSR24
Draws 800 mA from the 1.67 A supply
USB-SSR08
Draws 300 mA from the 1.67 A supply
Some devices may require their own external power supply in
a daisy chain configuration.
Up to eight optically isolated (500 V) digital input connection pairs are available from the signal I/O connector on
USB-PDISO8 Series devices.
If unsure as to how much current an application requires, MCC
recommends providing separate power to each connected device.
Each signal is applied to a bridge rectifier so that the input is
not polarity-sensitive.
External Power
USB-PDISO8 Series devices require between 6.5 V and 12.5 V
of external power. USB-SSR Series and USB-ERB Series devices
require between 6.0 V and 12.5 V of external power.
An external power connection using the included external power
supply is required to activate relays and SSR modules, and to
run tests in software.
• USB-PDISO8 Series devices, USB-SSR Series devices, and the
USB-ERB08 are powered by a 9 V, 1.67 A external power
supply (CB-PWR-9) that ships with each device.
• The USB-ERB24 is powered by an external 9 V, 3 A regulated power supply (CB-PWR-9V3A) that ships with the
device.
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USB DIO High Voltage and Relay
Software
Software Support
The USB-PDISO8, USB-ERB, and USB-SSR Series devices are supported by the software in the table below.
Ready-to-Run Applications
DAQami™
InstaCal™
TracerDAQ™ and
TracerDAQ Pro
(USB-PDISO8 Series
digital inputs only)
Data acquisition companion software with drag-and-drop interface that is used to acquire,
view, and log data, and generate signals. DAQami can be configured to log analog, digital, and
counter channels, and to view that data in real-time or post-acquisition on user-configurable
displays. Logged data can be exported for use in Excel® or MATLAB®. Windows OS
DAQami is included with the free MCC DAQ Software bundle. Install DAQami and try the
fully-functional software for 30 days. After 30 days, all features except for data logging and data
export will continue to be available – data logging and data export features can be unlocked by
purchasing the software.
An interactive installation, configuration, and test utility for MCC hardware. Windows OS
InstaCal is included with the free MCC DAQ Software bundle.
Virtual strip chart, oscilloscope, function generator, and rate generator applications used to
generate, acquire, analyze, display, and export data. Supported features may vary by hardware.
The Pro version provides enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle.
TracerDAQ Pro is available as a purchased software download.
General-Purpose Programming Support
Universal Library™
(UL) for Windows
Library for developing applications in C, C++, VB, C# .Net, VB .Net, and Python on Windows.
The UL for Windows is included with the free MCC DAQ Software bundle.
The UL Python API for Windows is available on GitHub (github.com/mccdaq/mcculw).
Library for developing applications in C, C++, and Python on Linux.
UL for Linux®
UL for Linux is available on GitHub (github.com/mccdaq/uldaq).
Open-source, third-party Linux drivers are also available for supported MCC devices.
Application-Specific Programming Support
ULx for
NI LabVIEW™
DASYLab®
MATLAB Driver
®
A comprehensive library of VIs and example programs for NI LabVIEW that is used to develop
custom applications that interact with most MCC devices. Windows OS
ULx for NI LabVIEW is included with the free MCC DAQ Software bundle.
Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming. Windows OS
DASYLab is available as a purchased software download. An evaluation version is available for
28 days.
High-level language and interactive environment for numerical computation,
visualization, and programming. The Mathworks Data Acquisition Toolbox™ allows users to
acquire data from most MCC PCI and USB devices.
Visit www.MathWorks.com for more information about the Data Acquisition Toolbox.
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USB DIO High Voltage and Relay
Specifications - USB-PDISO8 Series
USB-PDISO8 Series Block Diagram
Differential
Isolated Inputs
Form C
Relay Outputs
0 to
7 7
Relays
0 to
Inputs
0 to
Relays
0 to
7 7Signal I/OInputs
Control
Control
Control Connector Control
USB-PDISO8: 24 screw terminals
USB-PDISO8/40: 40-pin connector
Control
Registers
9V
Nominal
External
Power
8
CLo
Power
Monitor
CHi
Power
Regulator
Relay
Driver
USB Controller
8
Specifications
USB 2.0
USB Interface
Voltage range (AC with filter)
Input high: 6.0 Vrms min (50 Hz to 1000 Hz)
Input low: 1.5 Vrms max (50 Hz to 1000 Hz)
Response
Filter disabled: 20 µs
Filter enabled: 5 ms
Filters
Time constant: 5 ms (200 Hz)
Filter control: Software-selectable for each input.
Power-up /reset: Filters disabled
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
USB-PDISO8 Series
Relay specifications
Number: 8
Contact configuration: 8 FORM C (SPDT) NO, NC, and Common available at
connector.
Contact rating: 6 A @ 240 VAC or 28 VDC resistive (refer to Main Connector
on page 5)
Contact resistance: 100 mΩ max
Operate time: 10 ms max
Release time
USB-PDISO8: 5 ms max
USB-PDISO8/40: 10 ms max
Vibration: 10 Hz to 55 Hz (dual amplitude 1.5 mm)
Shock: 10 G (11 ms)
Dielectric isolation: 500 V (1 minute)
Life expectancy: 10 million mechanical operations, min
Power on RESET state: Not energized. NC in contact to Common.
Power
USB +5 V input voltage range: 4.75 V to 5.25 V
USB +5 V supply current: All modes of operation: 10 mA max
External power input: 9 V nominal
External power supply (required): MCC p/n CB-PWR-9: 9 V @ 1.67 A
Voltage supervisor limits - PWR LED
6.5 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)
USB-PDISO8 Series devices monitor the external +9 V power supply voltage
with a voltage supervisory circuit. If this power supply exceeds its specified
limit, the PWR LED turns off, indicating a power fault condition.
6.5 V ≤ Vext < 12.5 V: PWR LED = On
External power consumption
All relays on, 100 mA downstream hub power: 820 mA typ, 900 mA max
All relays off, 0 A downstream hub power: 200 mA typ, 230 mA max
Isolated inputs
Number: 8
Isolation: 500 V
Resistance: 1.6 KΩ min
Voltage range (DC)
Input high: +5.0 VDC min or –5.0 VDC min
Input low: +1.5 VDC max or –1.5 VDC max
Input range: 30 VDC max
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USB DIO High Voltage and Relay
Specifications - USB-PDISO8 Series
Mechanical
External power output
USB-PDISO8 dimensions (L × W × H)
PCB: 304.3 × 121.9 × 20.0 mm (12.0 × 4.8 × 0.8 in.)
Enclosure: 342.9 × 125.7 × 58.9 mm (13.5 × 4.95 × 2.32 in.)
USB-PDISO8/40 dimensions (L × W × H)
PCB: 304.3 × 121.9 × 17.8 mm (12.0 × 4.8 × 0.7 in.)
Enclosure: 342.9 × 125.7 × 58.9 mm (13.5 × 4.95 × 2.32 in.)
External power output - current range: 4.0 A max
The daisy chain power output option allows multiple MCC USB products with
a USB hub output port to be powered from a single external-power source in a
daisy-chain fashion. The voltage drop between the device power supply input
and the daisy-chain output is 0.5 V maximum. Users must plan for this drop
to assure the last device in the chain receives at least 6.5 VDC. A user-supplied
custom cable is required to daisy chain multiple devices.
External power output: Voltage drop between power input and daisy chain
power output: 0.5 V max
Environmental
Operating temperature range: 0 °C to 70 °C
Storage temperature range
USB-PDISO8: -40 °C to 100 °C
USB-PDISO8/40: -40 °C to 85 °C
Humidity: 0% to 95% non-condensing
USB Specifications
USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)
Device compatibility: USB 1.1, USB 2.0
USB-PDISO8: Hardware revision F and later are also compatible with USB 3.0.
The revision is indicated on the part number label on the housing
– 197241X-01 – where X is the hardware revision.
USB-PDISO8/40: Hardware revision C and later are also compatible with
USB 3.0. The revision is indicated on the part number label on the housing
– 197242X-01 – where X is the hardware revision.
USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB products with a USB hub output port
USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 or
equivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-)
USB cable length: 3 meters max
Main Connector
USB-PDISO8
Connector type: Screw terminal
Wire gauge range: 12 AWG to 22 AWG
USB-PDISO8/40
Connector type: P14: 40-pin header
Compatible cables
C40FF-x: 40-conductor ribbon cable, female both ends, x = length in feet.
C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in feet.
Compatible accessory products
Using the C40FF-x cable: CIO-MINI40
Using the C40-37F-x cable: CIO-MINI37
Max current: 1 A
USB-ERB08 Block Diagram
9.0 V
External
Power
Power
Monitor
Power
Regulator
6
NC C NO
5
Channel
Relay6 3relay
Switch S1
(inv/non-inv)
Measurement Computing
8
NC C NO
Channel
Relay4 5relay
Channel
Relay7 2relay
NC C NO
2
Channel
Relay8 1relay
NC C NO
1
4
Load
4
Channel
Relay5 4relay
Relay
Driver
driver
7
Channel
Relay3 6relay
NC C NO
USB
Microcontroller
Channel
Relay2 7relay
3
USB
Interface
4
NC C NO
Relay
Driver
driver
NC C NO
Channel
Relay1 8relay
NC C NO
Screw terminal
Switch S2
(pull-up/down)
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USB DIO High Voltage and Relay
Specifications - USB-ERB Series
Relay 14
Relay 13
Relay 12
USB
USB
Interface
Interface
USB
Microcontroller
Relay 11
Relay
driver
Driver
8
Relay 10
Relay 9
Relay 8
Switch
Switch S1
S1
(inv/non-inv)
)
(inv/non-inv)
Relay 7
Switch
Switch S2
S2
(pull-up/down)
(pull-up/down))
Relay 6
Relay
Driver
driver
8
Relay 5
Relay 4
Relay 3
Relay 2
Relay 1
USB-ERB Series
Number of relays
USB-ERB08: 8
USB-ERB24: 24
Relay configuration
USB-ERB08: 2 banks of 4
USB-ERB24: 2 banks of 8 and 2 banks of 4
Contact configuration
USB-ERB08: 8 Form C (SPDT) normally open (NO), normally closed (NC) and
common (C) available at screw terminals
USB-ERB24: 24 FORM C (SPDT) NO, NC and C available at screw terminals
Contact rating: 5 A @ 240 VAC or 28 VDC resistive
Contact resistance: 100 mΩ max (initial value)
Operate time: 10 ms max
Release time: 5 ms max
Vibration: 10 Hz to 55 Hz (dual amplitude 1.5 mm)
Shock: 10 G (11 ms)
Dielectric isolation
Between relay open contact: 300 VAC, 50/60 Hz (1 minute)
Between PCB output lines: 500 VAC, 50/60 Hz (1 minute)
Life expectancy: 10 million mechanical operations, min
Power on RESET state
S2 = pull-up: Energized. NO in contact with Common
S2 = pull-down: Not energized. NC in contact with Common
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23
22
21
20
19
18
17
16
15
Relay control logic polarity: User-configurable per bank through switch S1 for
invert or non-invert (default). Switch settings for polarity can be read back with
software over the USB bus. Switch settings do not affect the power‑on condition.
Non-invert mode: When 0 is written or read back via the USB bus, relays are
not energized.
Invert mode: When 0 is written or read back via the USB bus, relays are energized.
Pull-up/pull-down (controls relay power on state): User-configurable per bank
through switch S2 for pull-down (default) or pull-up. Switch settings can be
read back with software.
• Pull-down puts the relays in non-energized mode on power up.
• Pull-up puts the relays in energized mode on power up.
Output Specifications
Measurement Computing
14
Relay 15
13
Relay 16
Power
Regulator
12
Relay 17
11
Relay 18
10
Relay 19
9
4
8
Relay
Driver
driver
7
Relay 20
6
Relay 21
5
Power
Monitor
Relay 22
4
9.0 V
External
Power
3
4
2
Relay 23
Relay
Driver
driver
Screw terminal
1
Relay 24
NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO
USB-ERB24 Block Diagram
Power
USB +5 V input voltage range: 4.75 V min to 5.25 V max
USB +5 V supply current (all modes of operation): 10 mA max
Voltage supervisor limits - PWR LED
6.0 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)
6.0 V ≤ Vext < 12.5 V: PWR LED = On
The daisy chain power output option allows multiple MCC USB Series products
with a USB hub output port to be powered from a single external power source
in a daisy chain fashion. The voltage drop between the device power supply
input and the daisy chain output is 0.5 V max. Users must plan for this drop
to assure the last device in the chain receives at least 6.0 VDC.
External power consumption
All relays on, 100 mA downstream hub power
USB-ERB08: 750 mA typ, 850 mA max
USB-ERB24: 1.5 A typ, 1.8 A max
All relays off, 100 A downstream hub power
USB-ERB08: 170 mA typ, 200 mA max
USB-ERB24 230 mA typ, 270 mA max
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USB DIO High Voltage and Relay
Specifications - USB-ERB Series
External Power Input
USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 or
equivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-).
USB cable length: 3 meters max.
External power input: +6.0 VDC to 12.5 VDC (9 VDC power supply included)
External power supply (included)
USB-ERB08
MCC p/n CB-PWR-9: 9 V @ 1.67 A
USB-ERB24
MCC p/n CB-PWR-9V3A: 9 V ±10% @ 3 A
Relay Contact Pull-Up/Down Option
Relays NO contact pull-up (to USB +5 V)/pull-down, user installed
USB-ERB08: R1, R3, R5, R7, R10, R12, R14, R16
USB-ERB24: R35, R36, R41, R43, R45, R47, R49, R51, R87, R89, R91, R93, R96,
R98, R100, R102, R103, R105, R107, R109, R112, R114, R116, R118
Relays NC contact pull-up (to USB +5 V)/pull-down, user installed
USB-ERB08: R2, R4, R6, R8, R9, R11, R13, R15
USB-ERB24: R37, R40, R42,R44, R46, R48, R50, R52, R88, R90, R92, R94, R95,
R97, R99, R101, R104, R106, R108, R110, R111, R113, R115, R117
External Power Output
External power output (current range): 4.0 A max
External power output (voltage drop between power input and daisy chain
power output: 0.5 V max
USB-ERB Series devices monitor the external +9 V power supply voltage with a voltage supervisory circuit. If this power supply exceeds its
specified limit, the PWR LED turns off, indicating a power fault condition.
A user-supplied custom cable is required to daisy chain multiple devices.
Mechanical
USB-ERB08 dimensions (L × W × H)
PCB: 203.2 × 121 × 20.0 mm (8.0 × 4.8 × 0.8 in.)
Enclosure: 241.3 × 125.7 × 58.9 mm (9.50 × 4.95 × 2.32 in.)
USB-ERB24 dimensions (L × W × H)
PCB: 431.8 × 121 × 20.3 mm (17.0 × 4.8 × 0.8 in.)
Enclosure: 482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.)
USB Specifications
USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)
Device compatibility: USB 1.1, USB 2.0
USB-ERB08: Hardware revision E and later are also compatible with USB 3.0. The
revision is indicated on the part number label on the housing – 193776X-01L
– where X is the hardware revision.
USB-ERB24: Hardware revision G and later are also compatible with USB 3.0. The
revision is indicated on the part number label on the housing – 193773X-01L
– where X is the hardware revision.
USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB Series devices
Main Connector
Connector type: Screw terminal
Wire gauge range: 12 to 22 AWG
Environmental
Operating temperature range: 0 to 70 °C
Storage temperature range: -40 to 100 °C
Humidity: 0% to 95% non-condensing
USB-SSR Series
USB-SSR08 Block Diagram
9.0 V
External
Power
Power
Monitor
Switch S1
(I/O Type)
Power
Regulator
SSR modules 1 to 4 (Port C LO)
SSR
module
SSR
module
SSR
module
Bidiectional
Buffer
USB
Microcontroller
SSR
SSR
module
module
SSR
SSR
module
module
SSR
SSR
module
module
4
Bidiectional
Buffer
500 mA
USB 2.0
Compliant
Interface
8
7
+-+-
SSR
SSR
module
module
6
5
4 3
+-+- +-+-
SSR
module
2
1
+-+-
Load
4
SSR modules 5 to 8 (Port C HI)
Screw
Terminal
Measurement Computing
Switch S3
(Pull-Up/Down)
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Switch S2
(Inv/Non-Inv)
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USB DIO High Voltage and Relay
Specifications - USB-SSR Series
USB-SSR24 Block Diagram
SSR
Module 4
SSR
Module 3
SSR
Module 2
SSR
Module 1
SSR
Module 7
SSR
Module 8
Power
Monitor
SSR
Module 11
SSR
Module 12
Power
Regulator
8
USB
Microcontroller
4
Bidiectional
Buffer
4
Bidiectional
Buffer
500 mA
USB 2.0
Compliant
Interface
SSR
Module 24
SSR
Module 23
SSR
Module 22
SSR Modules 17-20 (Port CL)
I/O module logic polarity: Selectable with switch S2. Switch settings for polarity
can be read back with software. Default to non-inverted. For input modules,
invert mode returns a 1 when module is active; non-invert mode returns a
0 when module is active. For output modules, invert mode allows users to
write a 1 to activate the module; non-invert mode allows users to write a 0 to
activate the module.
Pull-up/pull-down on digital I/O lines: Configurable with switch S3 with 2.2 kΩ
resistor network. Switch settings for pull-up/pull-down selection can be read
back with software. Default to pull-up. Switch settings are applicable during
power up conditions of output modules only. Modules are active Low. When
switch to Pull-up, modules are inactive on power up. When switched to pulldown, modules are active on power up.
USB-SSR08
Modules 1-4: Selectable with switch S1 in the CL position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.
Modules 5-8: User-selectable with switch S1 in the CH position as either input
modules or output (default) modules. Switch settings for direction can be read
back with software. Do not mix input and output modules within this bank of
four.
USB-SSR24
Modules 1-8: Selectable with switch S1 in the A position as either input or
output (default) modules Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of eight.
Modules 9-16: Selectable with switch S1 in the B position as either input
modules or output (default) modules. Switch settings for direction can be read
back with software. Do not mix input and output modules within this bank of
eight.
Modules 17-20: Selectable with switch S1 in the CL position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.
Modules 21-24: Selectable with switch S1 in the CH position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.
(508) 946-5100
Switch S2
(Inv/Non-Inv)
Switch S3
(Pull-Up/Down)
SSR Modules 21-24 (Port CH)
I/O Module Configuration
Measurement Computing
Bidiectional
Buffer
SSR
Module 16
SSR
Module 20
SSR
Module 15
SSR
Module 19
SSR
Module 14
SSR
Module 18
SSR
Module 13
SSR Modules 9-16 (Port B)
SSR
Module 17
16 15
18 17
24 23 22 21
+-+- +-+- +-+-
20 19
Screw terminal
+-+- +-+- +-+-
14 13
Load
SSR
Module 21
12 11
10 9
8
SSR
Module 6
Bidiectional
Buffer
SSR
Module 10
+-+- +-+- +-+-
7
8
SSR
Module 5
6
5
4 3
+-+- +-+-
SSR Modules 1-8 (Port A)
9.0 V
External
Power
SSR
Module 9
2
1
+-+-
Switch S1
(I/O Type)
Power
USB +5 V input voltage range: 4.75 V min to 5.25 V max
USB +5 V supply current (all modes of operation)
USB-SSR08: Vext or Vext > 12.5 V: PWR LED = Off (power fault)
6.0 V ≤ Vext < 12.5 V: PWR LED = On
8
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USB DIO High Voltage and Relay
Specifications - USB-SSR Series
Digital I/O Transfer Rates
External power consumption
All modules on, 100 mA downstream hub power
USB-SSR08: 300 mA typ, 360 mA max
USB-SSR24: 800 mA typ, 950 mA max
All modules off, 0 mA downstream hub power
USB-SSR08: 180 mA typ, 220 mA max
USB-SSR24: 200 mA typ, 220 mA max
Digital I/O transfer rate (software paced): System dependent, 33 to 1000 port
reads/writes or single bit reads/writes per second typ.
Mechanical
USB-SSR08 dimensions (L × W × H)
PCB (without modules): 8.0 × 4.8 × 0.885 in. (203.2 × 121.9 × 22.5 mm)
Enclosure: 9.50 × 4.95 × 2.32 in. (241.3 × 125.7 × 58.9 mm)
USB-SSR24 dimensions (L × W × H)
PCB (without modules): 431.8 × 121.9 × 22.5 mm (17.0 × 4.8 × 0.885 in.)
Enclosure: 482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.)
External Power Input
External power input: +6.0 VDC to 12.5 VDC (9 VDC power supply included)
External power supply (included; required for USB-SSR24)
MCC p/n CB-PWR-9: 9 V @ 1.67 A
Main connector
External Power Output
Connector type: Screw terminal
Wire gauge range: 12 to 22 AWG
External power output (current range): 4.0 A max
USB-SSR Series devices monitor the external +9 V power supply voltage with a
voltage supervisory circuit. If this power supply exceeds its specified limit, the
PWR LED turns off, indicating a power fault condition.
External power output (voltage drop between power input and daisy chain
power output: 0.5 V max
The daisy chain power output option allows multiple MCC USB boards to be
powered from a single external power source in a daisy chain fashion. The
voltage drop between the module power supply input and the daisy chain
output is 0.5 V max. Users must plan for this drop to assure the last module in
the chain receives at least 6.0 VDC. A user-supplied custom cable is required
to daisy chain multiple devices.
SSR Digital I/O Modules
Specifications for the SSR modules available for the USB-SSR Series are listed below.
Digital Input Sensing Modules
USB Specifications
USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)
Device compatibility: USB 1.1, USB 2.0
USB-SSR Series revision F and later are also compatible with USB 3.0. The revision determined from the part number label on the housing as follows:
USB-SSR08: The part number label on the housing shows as 193779X-01L,
where X is the hardware revision
USB-SSR24: The part number label on the housing shows as 93782X-01L, where
X is the hardware revision
MCC part
number
Input
type
Isolation
voltage
Input
voltage
range
Input
current
@ max line
Turn-on
time
Turn-off
time
SSR-IAC-05
AC
4000 Vrms
90-140
VAC/DC
8 mA
20 ms
20 ms
SSR-IAC-05A
High voltage
AC
4000 Vrms
180-280
VAC/DC
6 mA
20 ms
20 ms
SSR-IDC-05
DC
4000 Vrms
3-32 VDC
18 mA
0.20 ms
0.40 ms
18 mA
5 ms
5 ms
SSR-IDC-05NP
Non-polarized,
15-32 VAC,
4000 Vrms
AC or DC
10-32 VDC
Digital Output Switching Modules
USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB Series devices
USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 or
equivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-).
USB cable length: 3 meters max.
MCC part
number
Output
type*
Isolation
voltage
Load
voltage
range
Load
current
range
Turn-on
time
Turn-off
time
SSR-OAC-05
AC
4000 Vrms
24-140
VAC
0.03-3.5 A
8.33 ms
8.33 ms
SSR-OAC-05A
AC
4000 Vrms
24-280
VAC
0.03-3.5 A
8.33 ms
8.33 ms
SSR-ODC-05
DC
4000 Vrms
3-60 VDC
0.02-3.5 A
20 µs
50 µs
SSR-ODC-05A
DC
4000 Vrms 4-200 VDC 0.02-3.5 A
75 µs
750 µs
* SPST, normally open
Measurement Computing
(508) 946-5100
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USB DIO High Voltage and Relay
Ordering
Order Information
SSR Digital I/O Modules (USB-SSR Series Only)
Hardware
Part No.
Description
USB-PDISO8
USB-based eight Form C relay and eight isolated highvoltage input interface device. Includes power supply
and USB cable.
USB-PDISO8/40
USB-based eight Form C Relay and eight isolated highvoltage input interface device with 40-pin connector.
Includes power supply and USB cable.
USB-SSR08
USB-based solid-state eight I/O module interface
device. Includes power supply and USB cable.
USB-SSR24
USB-based solid-state 24 I/O module interface device.
Includes power supply and USB cable.
USB-ERB08
USB-based 8-channel electromechanical relay interface
device. Includes power supply and USB cable.
USB-ERB24
USB-based 24-channel electromechanical relay
interface device. Includes power supply and USB cable.
CB-PWR-9
Description
Replacement power supply, 9 V, for USB-PDISO8 Series,
USB-SSR Series, and USB-ERB08. Interchangeable power
plugs are available separately.
CB-PWR-9V3A
Replacement power supply, 9 V, for USB-ERB24
PS-9V1AEPS230V
Replacement 230 V power supply, 9 V output, for
USB-PDISO8 Series, USB-SSR Series, and USB-ERB08.
Interchangeable power plugs are available separately.
CIO-MINI40
Description
SSR-IAC-05
AC sense input module, 90 to 140 VAC/VDC
SSR-IAC-05A
AC sense input module, 180 to 280 VAC/VDC
SSR-IDC-05
DC sense input module, 3 to 32 VDC
SSR-IDC-05NP
DC sense input module, 10 to 32 VDC non-polarized
SSR-OAC-05
AC switch output module, 24 to 140 VAC,
3.5 A @ 120 VAC, SPST normally open
SSR-OAC-05A
AC switch output module, 24 to 280 VAC,
3.5 A @ 240 VAC, SPST normally open
SSR-ODC-05
DC switch output module, 3 to 60 VDC @ 3.5 A, SPST
normally open
SSR-ODC-05A
DC switch output module, 4 to 200 VDC @ 3.5 A, SPST
normally open
Software also Available from MCC
Accessories and Cables
Part No.
Part No.
Part No.
Description
DAQami
Easy-to-use advanced data logging application to
acquire, view, and log data
TracerDAQ Pro*
Out-of-the-box virtual instrument suite with strip
chart, oscilloscope, function generator, and rate
generator – professional version
DASYLab
Icon-based data acquisition, graphics, control, and
analysis software
* TracerDAQ Pro only supports USB-PDISO8 Series digital inputs; it does not
support USB-ERB Series or USB-SSR Series devices.
Universal screw-terminal board, 37-pin
Measurement Computing
DS USB-High-Voltage-Relay-DIO
(508) 946-5100
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June 2021. Rev 4
© Measurement Computing Corporation