Appendices
A-36
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.
z 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-4-2 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