A-4-2 Recommended Rs-422A/485 Wiring - Omron CP1E Series User Manual

Appendices
4
Return the heat-shrinking tube to the soldered portion, then heat the tube to shrink it in place.
Assembling Connector Hood
Assemble the connector hood as shown below.
End connected to FG
Grounding plate
A-4-2 Recommended RS-422A/485 Wiring
Use the following wiring methods for RS-422A/485 to maintain transmission quality.
1
Always use shielded twisted-pair cables as communications cables.
• Recommended RS-422A/485 Cables
CO-HC-ESV-3P×7/0.2
2
Connect the shield of the communications cable to the FG terminal on the RS-422A/485 Option
Board.
At the same time, ground the ground terminal (GR) of the CPU Unit to 100 Ω or less.
Precautions for Correct Use Precautions for Correct Use
Always ground the shield only at the RS-422A/485 Option Board end.
Grounding both ends of the shield may damage the device due to the potential difference
between the ground terminals.
A-36
Heat-shrinking tube
End not connected to FG
Aluminum foil tape
Model numbers Manufacturer
Hirakawa Hewtech Corp.
CP1E CPU Unit Hardware User's Manual(W479)