Thumbwheel Switch
A7BS/A7BL
CSM_A7BS_A7BL_DS_E_3_2
Wide Range of Locking-type
Models Available
• Character height of 4.8 or 3.2 mm makes for easy-toview display.
• Installation is easy with snap-in mounting.
• The series includes a complete range of locking-type
models that prevent accidental operation.
Ordering Information
Switches (Single Switch Units)
Model
A7BS
Snap-in (front mounting)
A7BS-20@-S
Snap-in (front mounting)
Classification
(See note 1.)
With external stoppers
Character height
Terminals
Color
Output code number
06 (binary coded decimal)
07 (binary coded decimal, with component
adding provision) *3
19 (decimal code, with component-adding provision)
54 (binary coded hexadecimal)
55 (binary coded hexadecimal, with
component-adding provision) *3
Model
Decimal: 4.8 mm Hexadecimal: 3.2 mm
4.8 mm
Solder terminals *1
Light gray
Black
Light gray
Black
Model
A7BS-206 *2
A7BS-206-1 *2
A7BS-206-S
A7BS-206-S-1
A7BS-207 *2
A7BS-207-1 *2
A7BS-207-S
A7BS-207-S-1
A7BS-219
A7BS-254
A7BS-219-1
A7BS-254-1
-----
-----
A7BS-255
A7BS-255-1
---
---
A7BL
Snap-in (front mounting)
Classification
(See note 1.)
Locking type
Character height
Terminals
Color
Output code number
06 (binary coded decimal)
07 (binary coded decimal, with componentadding provision) *3
4.8 mm
Solder terminals *1
Light gray
Black
Model
A7BL-206 *2
A7BL-206-1 *2
A7BL-207 *2
A7BL-207-1 *2
Note: 1. The classification diagrams show 4 Switch Units combined with End Caps to create 4-digit displays.
2. The model numbers given above are for Switch Units.
3. Models with +, - displays can also be produced. Add “-PM” (+/- alternating display) or “-MP” (-/+ alternating display) after the “206” or “207” in the model number
(e.g., A7BS-206-PM, A7BS-207-PM-1, or A7BS-206-MP). There is no “-MP” type available, however, for A7BS-20@-S models.
*1. For models with PCB terminals, add “-P2” to the model number (e.g., A7BS-207-P2-1).
*2. Models with internal stoppers are also available. Add “-S@@” after the “206” or “207” in the model number and specify the display range in the @@. For example, to
specify the range 0 to 6, add “-S06” to the model number (e.g., A7BS-206-S06-1).
*3. Models with diodes are available. Add “-D” to the model number (e.g., A7BS-207-D or A7BS-207-D-1).
1
A7BS/A7BL
Accessories (Order Separately)
Use accessories, such as End Caps, Spacers, and Connectors with the Switch Units.
End Caps, Spare Units, and Connectors
Accessory
Color
End Caps (1 pair)
Spacer
Solder terminals
Connectors
PCB terminals
Light gray
Black
A7B-M *
A7B-M-1 *
A7B-P@ (See note.)
A7B-P@-1 (See note.)
A7B-C
A7B-CP
Note: The @ in the Spacer model number stands for a letter in the range A to U. (Refer to the table in the following explanation about Spacers.)
* The minimum order is for 10 End Caps.
End Caps
Spacers
End Caps are used on the Switch Units at each end and allow all the
Switch Units to be securely mounted to a panel. They come in pairs,
one for the left and one for the right.
• Spacers are used for creating extra space or gaps between the
Switch Units and have the same dimensions as the Switch Units
themselves.
• There are also Spacers with engraved characters or symbols that
can be used for indicating units, such as time and length. (Refer to
the following table.) Consult your OMRON representative for
details.
Symbol
Stamp
A
No designation
B
C
D
E
F
G
SEC
MIN
H
g
kg
mm
Q
x 10
SEC
T
U
0
•
Symbol
H
J
K
L
Stamp
cm
m
°C
PCS
Specifications
Switching capacity (resistive load)
Continuous carry current
Contact resistance
Between non-connected
terminals
Insulation
resistance Between terminal and
non-current carrying part
Between non-connected
terminals
Dielectric
strength
Between terminal and
non-current carrying part
Vibration resistance
Shock resistance
Mechanical
Durability
Electrical
Ambient temperature
Ambient humidity
Max. operating force
5 to 28 VDC or 50 VAC
1 mA to 0.1 A
1 A max.
300 mΩ max.
10 MΩ min. (at 500 VDC)
1,000 MΩ min. (at 500 VDC)
600 VAC, 50/60 Hz for 1 min
1,000 VAC, 50/60 Hz for 1 min
10 to 55 Hz, 1.5-mm double amplitude
490 m/s2 min.
100,000 operations min.
50,000 operations min.
Operating: -10°C to 65°C (with no icing)
Storage: -20°C to 80°C
Operating: 45% to 85%
5.39 N max.
2
A7BS/A7BL
Dimensions
(Unit: mm)
Switches
A7BS-2@@(-1)
Solder Terminals
5.5
A
8±0.1
*
24.5
2.8
24
16
Number of
Switches
(n)
20.6 22
2.6
Solder terminal
Panel thickness: 1 to 3
* If the output code is 06 or 54, the dimension is 32.5;
if the output code is 07 or 55, the dimension is 43.5.
3.8
Panel Cutout
22.4+00.4
3
0.8
6.9
B
Thumbwheel Switches with External Stoppers:
A7BS-20@-S(-1)
• Use A7BS-S Stopper Pins to make dial display restrictions for these Switches.
• Insert the Stopper Pins in the positions required to give the desired display range. For
example, for a display range of 0 to 5, insert a Stopper Pin at position 1 (see following
diagram) to stop the display from going above 5 when the (+) button is pressed, and insert
a Stopper Pin at position 2 to stop the display from going below 0 when the (-) button is
pressed.
Refer to page 7 for details.
5.5
2.8
24.5
9
22 20.6
9
1
7
2
6
16
4
Stopper Pins
1.2 dia.
2.4 dia.
0.4
2.7
Note: 1. Two pins constitute one set.
2. The first shipment is free and is attached
to the Switch.
Order the A7BS-S separately if it is
required for maintenance.
0
8
1
6
3
7
24
3
5
Note: 1. The dimensions above include both End
Caps, and will increase 8 mm for each
Spacer inserted.
2. Unless otherwise specified, a tolerance of
±0.4 mm applies to all dimensions.
The tolerance for multiple connection is
±(number of units x 0.4) mm.
Pin insertion position (2)
0
8
14.4
22.4
30.4
38.4
46.8
54.8
62.8
70.8
78.8
86.8
14
22
30
38
46
54
62
70
78
86
16
24
32
40
48
56
64
72
80
88
1
2
3
4
5
6
7
8
9
10
Size C
C+0.3
0
P=8±0.2
*
Size A
Size B
(n x 8 + 8) (n x 8 + 6)
2
2.6
5
4
Pin insertion position (1)
Ten, 1.2 dia.
* If the output code is 06, the dimension is 32.5;
if the output code is 07, the dimension is 43.5.
A7BL-206(-1)
A7BL-207(-1)
Solder Terminals,
Locking Models
6.1
8±0.1
A
24
15.4
Number of
Switches
(n)
*
24.5
2.8
20.6 22
2
Solder terminal
When setting
Panel thickness: 1 to 3
3.6
* If the output code is 06, the dimension is 32.5;
if the output code is 07, the dimension is 43.5.
Panel Cutout
22.4+0.4
0
3
6.9
0.8
B
P=8±0.2
C+00.3
1
2
3
4
5
6
7
8
9
10
Size A
Size B
(n x 8 + 8) (n x 8 + 6)
16
24
32
40
48
56
64
72
80
88
14
22
30
38
46
54
62
70
78
86
Size C
14.4
22.4
30.4
38.4
46.8
54.8
62.8
70.8
78.8
86.8
Note: 1. The dimensions above include both End
Caps, and will increase 8 mm for each
Spacer inserted.
2. Unless otherwise specified, a tolerance of
±0.4 mm applies to all dimensions.
The tolerance for multiple connection is
±(number of units x 0.4) mm.
3
A7BS/A7BL
Accessories (Order Separately)
End Caps for Push-operated Switches
A7B-M(-1) Snap-in Panel Mounting
Left Side
Right Side
(30)
24
3.2
2.8
4
4
(30)
24
2.8
3.2
24.5
24.5
2.4
22
(3.5)
3
3
(3.5)
3
22
Spacers for Push-operated Switches
A7B-P@(-1) Snap-in Panel Mounting
24
2.8
3
22
24.5
8±0.1
The @ in the Spacer model number stands for a letter in the range A to U. (Refer to the table under the explanation about Spacers on page 2.)
Note: Unless otherwise indicated, dimensional tolerances for dimensions in the models above are ± 0.4 mm.
Connectors (These devices allow Switches to be quickly removed for maintenance and inspection of connectivity, and quickly re-installed.)
A7B-C
Solder Terminals
37
31
24
21
3.3 dia.
7.8
Inserting Connectors
UP
9
20.5
P=2.54
1
3
2
3
7
5
4
Insert Connectors with the “UP” arrow
pointing up.
13.5
6
22
A7B-CP
PCB Terminals
24
21
7.8
UP
9
17.5
Connector
13.5
0.6 x 0.6
3
P = 2.54
1
3
2
7
5
4
6
22
Note: Unless otherwise indicated, dimensional tolerances for dimensions in the models above are ± 0.4 mm.
4
A7BS/A7BL
Output Codes/Terminals
• Switches with output codes 06 or 07 both use binary coded decimal
but Switches with output code 07 have a component-adding
provision. Similarly, Switches with output codes 54 or 55 both use
binary coded hexadecimal but Switches with output code 55 have
a component-adding provision.
Output code
number
• How to Read Output Codes
For example, when the dial position is “3,” the common terminal C
on the Switch is connected to terminals 1 and 2. When the Switch
is inserted into the Connector, the common terminal C becomes
connector terminal 2, and terminals 1 and 2 become connector
terminals 4 and 5 respectively.
Terminals
Output codes
Model
06
06
07
Fourteen,
1-dia. holes
Dial
07
Switch Unit or Common terConnector
minal number
Switch Unit
C
Connector
2
Connector
1
0
1
2
3
4
5
6
7
8
9
Terminals connected to
common
1
2
4
8
4
5
6
7
4
5
6
7
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Note: The solid dot ● indicates that the internal switch is ON
(i.e., connected to the common terminal).
Twenty-eight,
1-dia. holes
Component-adding provision
Dial
1.3
9
19
Nineteen,
1-dia. holes
8
7
6
5
4
3
2
1
15
8
6
4
2
0
15
2.5
P=3.6
2.5
2.5
20.6
0
1
2
3
4
5
6
7
8
9
0
●
1
Terminal connected to common
2
3
4
5
6
7
8
9
●
●
●
●
●
●
●
●
●
Note: The solid dot ● indicates that the internal switch is ON
(i.e., connected to the common terminal).
5
A7BS/A7BL
Output code
number
Terminals
Output codes
Model
54
55
54
Fourteen,
1-dia. holes
Dial
55
Twenty-eight,
1-dia. holes
Component-adding provision
Switch Unit or Common terConnector
minal number
Switch Unit
C
Connector
2
Connector
1
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Terminals connected to
common
1
2
4
8
4
5
6
7
4
5
6
7
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Note: 1. The solid dot ● indicates that the internal switch is ON
(i.e., connected to the common terminal).
6
A7BS/A7BL
Ordering Procedure
Place orders as shown in the example below, specifying the model
and number. Standard products are not factory-assembled for
shipment. Contact your OMRON representative for details on
ordering factory-assembled sets.
4
1.
2.
3.
4.
1
3
2
4
A7BS-206 (Switch Unit): 2 pieces
A7BS-207 (Switch Unit): 2 pieces
A7B-PA (Spacer): 1 piece
A7B-M (End Caps): 1 pair
Safety Precautions
Refer to Precautions for Correct Use on page in the Technical Guide for Thumbwheel Switches.
Precautions for Correct Use
Handling
• The molded components of the Switch use polyacetal resin and
ABS resin. It is recommended that alcohol is used to wipe off dirt
and smudges from the molded components. Take care to prevent
the alcohol from getting inside.
• A7BS/A7BL Thumbwheel Switches are not drip-proof. Do not use
them in areas subject to water or oil.
• Do not allow solder flux or alcohol to enter the Switch.
Models with External Stoppers (A7BS-20@-S)
With the A7BS-20@-S, any range can be set externally using the
Stopper Pin. Insert the Stopper Pin using the following procedure:
(3) Stopper Pin (upper limit)
(2) Stopper Pin (lower limit)
(1) Display window
Setting Numbers
Locking Type
• Set with the setting button by raising it.
• Return the button to its original position after setting. It is then
locked to prevent rotation, and the set numbers will not change
accidentally.
Example: To Display the Range 0 to 7
1. Any number within the range of (0 to 7) can be chosen to limit the
numbers displayed in the display window. (In this example, 8 and
9 are outside of this range.)
2. First, insert the Stopper Pin in the hole
in front of the lower limit (“0”) for the
number to be defined.
3. Next, inset the Stopper Pin in the hole
past the upper limit (“7”) for the number
to be defined. (The Stopper Pins then
surround the exact range to be
defined.)
4. Confirm that the (+) push-button can no
longer be pushed after reaching the
upper limit of (“7”).
5. Confirm that the (-) push-button can no longer be pushed after
reaching the lower limit of (“0”). This completes the setting.
7
Read and Understand This Catalog
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or
comments.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified)
from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR
FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR COMMERCIAL LOSS
IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS
OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT
SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's
application or use of the products.
At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the
products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product,
machine, system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible
uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:
Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog.
Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles,
safety equipment, and installations subject to separate industry or government regulations.
Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE
SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND
INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons.
It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the products may be changed without any notice. When in doubt, special model numbers may be assigned to fix or
establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual
specifications of purchased products.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
PERFORMANCE DATA
Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the
result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON
Warranty and Limitations of Liability.
ERRORS AND OMISSIONS
The information in this document has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical,
typographical, or proofreading errors, or omissions.
2012.8
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2012 All Right Reserved.