10. Appendix
Fieldbus Communication
263
RCP6
10.2 When Connecting Power with Plus Grounding
There is a risk that 24V DC may get short-circuited if a PC is connected when used with plus
grounding. It is because many types of PC have communication ground (GND) and frame
ground (FG) connected inside, and short-circuit occurs through the frame ground (FG). Also,
when the connection is established with the serial communication between controllers using
different 24V DC power, the communication line may get damaged as the communication line
gets connected through the controller power line depending on the timing to turn the power on.
Troubleshooting and countermeasures are gathered in “ME0271 Caution when 24V Power
Controller being Plug Grounded”. Please refer to it for detail.
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