Appendices
A-38
CP1E CPU Unit Hardware User’s Manual(W479)
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.
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
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 UsePrecautions 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-3-2 Recommended RS-422A/485 Wiring
Model numbers Manufacturer
CO-HC-ESV-3P×7/0.2 Hirakawa Hewtech Corp.
Heat-shrinking tube
End connected to FG
Aluminum foil tape
Grounding plate
End not connected to FG
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