Important Wiring Considerations; Internal Circuitry - Omron CJ1W-CT021 Operation Manuals

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Important Wiring Considerations

Use the following guidelines when planning the system wiring of the Unit:
• Disconnect the power to the controller before wiring the unit.
• Make sure the PLC-system is properly grounded.
• Use shielded, twisted pair cables and ground the shield when wiring the Counter Inputs (A, B, Z) and
the Digital Inputs. When grounding the shield at the side of the Unit, use the same reference as the
ground terminal of the PLC-Power Supply is connected to.
• Make the wiring for the Counter Inputs A, B and Z as short as possible and do not route the wires par-
allel to lines that produce a lot of noise, such as high-voltage power lines.
• Try to use a separate stabilised Power Supply for the High-speed Counter Unit and another Power
Supply for other Units.
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Internal Circuitry

Digital Input Circuitry
Counter Input Circuitry
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
Phase A
Phase B
Phase Z
2 Components, Installation and Wiring
Digital Input I0: Digital Input I1:
24 V
B5 (24 V) B6 (24 V)
0 V
A6 (0 V)
A5 (0 V)
Counter 1:
24 V
B9 (24 V)
5 V/12 V
A9 (5 V)
LD+
B8 (LD+)
0 V/LD−
A8 (0 V/LD−)
Counter 1:
24 V
B11 (24 V)
5 V/12 V
A11 (5 V)
LD+
B10 (LD+)
0 V/LD−
A10 (0 V/LD−)
Counter 1:
24 V
B13 (24 V)
5 V/12 V
A13 (5 V)
LD+
B12 (LD+)
0 V/LD-
A12 (0 V/LD−)
Counter 2:
B16 (24 V)
A16 (12 V)
B15 (LD+)
A15 (0 V/LD−)
Counter 2:
B18 (24 V)
A18 (12 V)
B17 (LD+)
A17(0 V/LD−)
Counter 2:
B20 (24 V)
A20 (12 V)
B19 (LD+)
A19 (0 V/LD−)
2
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