Thumbwheel Switch
A7CN/A7CN-L
A Brand New Lineup of A7C
Series Compact Thumbwheel
Switches
• The series includes a complete range of locking-type
models that prevent accidental operation.
CSM_A7CN_A7CN-L_DS_E_2_1
Ordering Information
Switches (Single Switch Units)
Model
Screw mounting (back mounting)
Classification
(See note 1.)
A7CN
Snap-in (front mounting)
Terminals
Color
06 (binary coded decimal)
Output code
number
Model
PCB terminals
Light gray
---
Black
A7CN-106-1
Light gray
A7CN-206
Black
A7CN-206-1
A7CN-L
Snap-in (front mounting)
Classification
(See note 1.)
Locking type
PCB terminals
Light gray
A7CN-L206
Black
A7CN-L206-1
Terminals
Color
06 (binary coded decimal)
Output code
number
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” in the model number (e.g., A7CN-206-PM or A7CN-206-PM-1).
Accessories (Order Separately)
Use accessories, such as End Caps and Spacers, with the Switch Units.
Classification
Accessory
End Caps (1 pair)
Spacer
Color
Screw mounting
(back mounting)
Black
A7CN-1M-1 *
A7CN-1P@-1 (See note.)
Snap-in (front mounting)
Light gray
A7CN-2M *
A7CN-2P@ (See note.)
Black
A7CN-2M-1 *
A7CN-2P@-1 (See note.)
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.
1
A7CN/A7CN-L
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
Stamp
Symbol
Stamp
A
No desig-
nation
H
cm
B
SEC
J
m
C
MIN
K
°C
D
H
L
PCS
E
g
Q
x10
SEC
F
kg
T
0
G
mm
U
•
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
1 mA to 0.1 A
1A
200 mΩ max.
10 MΩ min. (at 250 VDC)
100 MΩ min. (at 500 VDC)
200 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
490m/s
2
min.
30,000 operations min.
20,000 operations min.
Operating: -10°C to 65°C (with no icing)
Storage: -20°C to 80°C
Operating: 35% to 85%
4.41 N max.
2
A7CN/A7CN-L
Dimensions
Switches
A7CN-106-1
PCB Terminals
C
B
A
6
±0.1
8
4
2
1
C
(Unit: mm)
15.7
4.6
2
3.5
Number of
Switches (n)
1
2
3
P=2.54
±0.2
Size A
(n x 6 + 6)
12
18
24
30
36
42
48
54
60
66
Size B
(n x 6 + 11)
17
23
29
35
41
47
53
59
65
71
Size C
(n x 6 + 16)
22
28
34
40
46
52
58
64
70
76
18
16
2.8
11.6
2
16
4
5
6
7
8
9
10
0.6
±0.2
PCB terminal
Panel thickness: 2
2.4
Panel Cutout
16.2
+0.5
0
Note: 1. The dimensions above include both End
Caps, and will increase 6 mm for each
Spacer inserted.
*
+0.7
2. Unless otherwise specified, a tolerance of
5.4
A
0
3
0.3
Tow, M2.5 or
P=6
±0.2
±0.4
mm applies to all dimensions.
M2.6
B
A
The tolerance for multiple connection is
* Terminal position dimensions
±(number
of units x 0.4) mm.
Note: Common terminal C is at the bottom when the Switch Unit is viewed
from the front.
A7CN-206(-1)
PCB Terminals
A
4
6
±0.1
4.9
15.5
2.2
3.5
Number of
Switches (n)
1
2
3
16
Size A
(n x 6 + 8)
14
20
26
32
38
44
50
56
62
68
Size B
(n x 6 + 6)
12
18
24
30
36
42
48
54
60
66
18
11.6
2
8
4
2
1
C
P=2.54
±0.2
4
5
6
7
8
9
10
0.6
±0.1
PCB terminal
Panel thickness: 1 to 2
2.4
Panel Cutout
16.2
+0.6
0
B
+0.7
0
*
5.4
3
0.3
P=6
±0.2
B
* Terminal position dimensions
Note: Common terminal C is at the bottom when the Switch Unit is viewed
from the front.
Note: 1. The dimensions above include both End
Caps, and will increase 6 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.
A7CN-L206(-1)
PCB Terminals
Locking Model
18
4.7
4
A
6
±0.1
15.5
2.2
3.5
Number of
Switches (n)
1
2
P=2.54
Size A
(n x 6 + 8)
14
20
26
32
38
44
50
56
62
68
Size B
(n x 6 + 6)
12
18
24
30
36
42
48
54
60
66
11.6 1.9
8
4
2
1
C
±0.2
3
16
4
5
6
7
8
9
10
When setting
0.6
±0.2
PCB terminal
Panel thickness: 1 to 2
2.4
Panel Cutout
16.2
+0.6
0
*
5.4
B
+0.7
0
3
P=6
±0.2
B
* Terminal position dimensions
0.3
Note: Common terminal C is at the bottom when the Switch Unit is viewed
from the front.
Note: 1. The dimensions above include both End
Caps, and will increase 6 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
A7CN/A7CN-L
Accessories (Order Separately)
End Caps for Push-operated Switches
A7CN-1M-1 Screw Mounting
Left Side
Right Side
End Caps for Push-operated Switches
A7CN-2M(-1) Snap-in Mounting
Left Side
Right Side
2
18
16
±0.2
8
2
3
±0.1
3
±0.1
8
2
18
16
±0.2
2
18
4
18
2
4
4
2.2
4
15.7 13.6
2.2
13.6 15.7
15.5 13.4
2.2
13.4 15.5
16
3
3
16
16
2.7
3
±0.1
3
±0.1
2.7
16
Spacers for Push-operated Switches
A7CN-1P@-1
Screw Panel Mounting Model
Spacers for Push-operated Switches
A7CN-2P@(-1)
Snap-in Mounting Model
18
16
18
16
±0.2
6
±0.1
9
2
11.65
2
9
6
±0.1
2.25
13.4
Note: 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 3.)
Note: 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 3.)
Note: Unless otherwise indicated, dimensional tolerances for dimensions in the models above are
±0.4mm.
Output Codes
06 (Binary Code)
Dial
0
1
2
3
4
5
6
7
8
9
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Terminals connected to common
1
2
4
8
Note: The solid dot
●
indicates that the internal switch is ON (i.e., connected to the common terminal).
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.
1. Switch Unit (snap-in mounting, black)
A7CN-206-1: 4 pieces
2. Spacer (snap-in mounting, no designation, black)
A7CN-2PA-1: 1 piece
3. End Caps (snap-in mounting, black)
A7CN-2M-1: 1 pair
3
1
2
1
3
4
A7CN/A7CN-L
Safety Precautions
Refer to
Precautions for Correct Use
on
in the
Technical Guide for Thumbwheel Switches
.
Precautions for Correct Use
Environment
•
Do not use where gases are generated (ammonia, chlorine, sulfur
dioxide).
•
Although Switches are of nearly dust-proof construction, they are
not drip-proof, therefore do not use in areas subject to water or oil
exposure and do not operate with wet or oily hands.
•
Provide additional dust-proofing measures, such as using a dust-
proof cover, when using in sand-exposed areas.
Screw-mounting Models
Tighten mounting screws to a torque between 0.2 to 0.24 N·m, using
M2.6 screws. Use plain washers or spring washers together with the
screws.
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.
Do not
push here
Handling
•
The A7CN cannot be connected to the A7C.
•
The molded components of the Switch use polyacetal resin and
polycarbonate 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.
Do not use thinner or other solutions which might damage the resin.
•
When changing settings, do not touch the operating buttons if your
fingers are wet or there is oil or any other foreign substance on your
fingers.
•
Do not drop the individual Switches. Doing so may damage the
resin catch (for connecting) on the side of the Switch.
•
When separating Switches, use a screwdriver as shown in the
figure below; disconnect them by releasing the top and bottom
hooks. Be careful not to bend the hooks.
Soldering
Note the following points when soldering
printed circuit boards:
•
The terminal insertion holes on the PCB must be at least 1 mm in
diameter.
•
Automatic Soldering
Do not use dip cleaning. Doing so may result in flux penetration of
the Switch interior, causing contact and rotational defects. Clean
the flux as shown in Figure 1, tilting the Switch 80° or less and using
a brush to apply the solvent only to the back of the board. It may
also be cleaned by dipping only the back of the board into the
solvent and then using a brush to clean.
•
Dip Soldering
When applying flux solvent, the dipping time is a maximum of 2
seconds. As shown in Figure 2, avoid flooding the top surface of the
printed circuit board with flux. Using a brush to apply flux further
reduces the danger of flux penetration. When cleaning flux with a
brush, tilt the Switch 80° or less, as shown in Figure 1, in order to
prevent flux from flowing onto the switch mounting surface. Clean
flux as described above under Automatic Soldering.
Figure 1
Figure 2
Top surface
of board
•
When connecting Switches, fit the mating parts together.
•
Do not push the (+) and (-) operating push-buttons at the same
time.
Back surface
of board
Models with PCB Terminals
Do not use excessive force in handling the Switches. In particular,
take care to avoid dropping them because the terminals might bend
or break.
80° or less
Wipe away flux
with a brush.
•
Using a Soldering Iron
Use a 30-W soldering iron at a temperature of 350°C for a
maximum of 3 seconds, and flush as described above.
Do not apply force to the terminals during soldering and for 3
minutes after soldering is completed. Doing so may result in
conduction or operation failure.
•
Ensure that soldering flux and alcohol do not penetrate into the
Switch interior
5
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