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599
Connections to Serial Communications Option Boards
Appendix F
Recommended RS-422A/485 Wiring Examples
Use the following wiring methods for RS-422A/485 to maintain transmission quality.
1.
Always use shielded twisted-pair cables as communications 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 (GR) terminal of the CPU Unit to 100
Ω
or less.
Note
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.
Connection examples are shown below.
• 2-Wire Connections
• 4-Wire Connections
• Using a B500-AL001-E Link Adapter
Model
Manufacturer
CO-HC-ESV-3Px7/0.2
Hirakawa Hewtech Corp.
CP1H CPU Unit
Option Board
Remote device
Shield
Pin
Signal
Signal
A (
−
)
B (+)
CP1H CPU Unit
Option Board
Remote device
Shield
Pin
Signal
Signal
CP1H CPU Unit
Option Board
Remote device
Signal
Pin
RS-422
interface
Remote device
B500-AL001-E
Signal
Signal
Pin
Signal
Pin
Pin
Signal
Signal
RS-422
RS-422
RS-422
Содержание CP1L - 12-2007
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