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Thumbwheel Switch
A7BS/A7BL
CSM_A7BS/A7BL_DS_E_6_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
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-254
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” after the “206” or “207” in the model number (e.g., A7BS-206-PM or A7BS-207-PM-1).
*1. For models with PCB terminals, add “-P2” to the model number (e.g., A7BS207-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).
For structural reasons, models with stoppers cannot be manufactured for
the A7BS-254 and A7BS-255.
*3. Models with diodes are available. Add “-D” to the model number (e.g., A7BS207-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.)
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
A
No desStamp
ignation
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
3.3 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
14
22
30
38
46
54
62
70
78
86
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.
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
16
24
32
40
48
56
64
72
80
88
Pin insertion position (2)
0
8
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
Fourteen,
1-dia. holes
06
07
Dial
07
Twenty-eight,
1-dia. holes
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).
Component-adding provision
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.
• To separate the Switches, use a flat-blade screwdriver as shown in
the following figure to release the hooks on the top and bottom and
then separate the Switches. Be careful not to bend the hooks.
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
Terms and Conditions Agreement
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.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses 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. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials 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 user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
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 part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016.4
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 2016 All Right Reserved.
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