A-43
Appendices
CP1E CPU Unit Hardware User’s Manual(W479)
A-3 Wiring for Serial Communications
App
A-3-2 Recommended RS-422A/485 Wiring
Terminal Wiring
When wiring the Rs-485 terminal block, treat either solid or stranded wires directly.
• To make the connection, press the release button in with a small flat blade screwdriver and push
the line in while the lock is released. Remove the screwdriver and lock it inside.
• To disconnect the wiring, press the release button in with a small flat blade screwdriver and pull
the line out while the lock is released.
Note 1 Note 1 Ferrules with/without plastic sleeve cannot be used.
2 When using stranded wire, twist the core so that the barbed wires cannot protrude.
3 Do not solder-plate the end of cable.
The screwdriver shown below is recommended for wiring.
Precautions for Correct UsePrecautions for Correct Use
Using the Built-in RS-485 Port or CP1W-CIF11 RS-422A/485 Option Board (Not Isolated)
Use the Built-in RS-485 Port or CP1W-CIF11 only when there is no difference in electrical poten-
tial between devices. Connect the shield on the communications cable at both ends to the FG
terminals on the RS-422A/485 terminal blocks to ground it. Do not allow the communications dis-
tance to exceed 50m.
Using the CP1W-CIF12 RS-422A/485 Option Board (Isolated)
Use the CP1W-CIF12 if there is a difference in electrical potential between devices or for long
distance communications (500 m max.).
Connect the shield on the communications cable only at the Option Board to ground it. If the
shield is connected at both ends of the cable when there is a difference in electrical potential, the
devices may be damaged.
Model numbers Manufacturer
SZS 0.4×2.5 Phoenix Contact
Release button
2-conductor shielded
twisted-pair cable
0.4mm
Side Front
2.5mm
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