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-to-
view 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-254
A7BS-255
A7BS-207-1 *2
A7BS-254-1
A7BS-255-1
A7BS-207-S
---
---
A7BS-207-S-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 component-
adding 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., 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).
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., 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.)
End Caps
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
•
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 des-
Stamp
ignation
H
cm
B
SEC
J
m
C
MIN
K
°C
D
H
L
PCS
E
g
Q
x 10
SEC
F
kg
T
0
G
mm
U
•
Symbol
Stamp
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/s
2
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
Switches
A7BS-2@@(-1)
Solder Terminals
5.5
8
±
0.1
A
2.8
(Unit: mm)
*
24.5
Number of
Switches
(n)
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
24
16
2.6
20.6 22
Solder terminal
Panel thickness: 1 to 3
3.8
* 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.
Panel Cutout
0.4
22.4
+
0
3
6.9
0.8
B
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.
P=8
±
0.2
C
+0.3
0
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.
*
24.5
9
8
0
1
2
6
5
4
3
Stopper Pins
2.4 dia.
0.4
2.7
1.2 dia.
5.5
2.8
9
8
16
2.6
24
7
6
5
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.
Pin insertion position (2)
0
1
2
3
4
22 20.6
7
Ten, 1.2 dia.
Pin insertion position (1)
* 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
24
6.1
8
±
0.1
A
2.8
*
24.5
Number of
Switches
(n)
Size A
Size B
(n x 8 + 8) (n x 8 + 6)
Size C
15.4
2
20.6 22
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.
1
2
3
4
5
6
7
8
9
10
16
24
32
40
48
56
64
72
80
88
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
Panel Cutout
22.4
+0.4
0
3
6.9
0.8
B
P=8
±
0.2
0.3
C+
0
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
(30)
24
3.2
2.8
4
Right Side
4
2.8
(30)
24
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
22
3
8
±0.1
2.8
24.5
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
7.8
3.3 dia.
Inserting Connectors
9
20.5
13.5
Insert Connectors with the “UP” arrow
pointing up.
P=2.54
1
2
3
4
5
6
7
UP
3
22
A7B-CP
PCB Terminals
7.8
24
21
9
17.5
Connector
13.5
UP
7
6
0.6 x 0.6
P = 2.54
1
2
3
4
5
3
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.
•
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.
Output codes
Output code
number
Terminals
Model
06
Fourteen,
1-dia. holes
06
07
Dial
07
Twenty-eight,
1-dia. holes
Switch Unit or Common ter-
Connector
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
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