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The ICS 3-304.81 Safety Recommendations are reproduced by permission of the National
Electrical Manufacturers Association from NEMA ICS 3-304
2.3 Communications Connections
The ports as you look at the back of the case, are the ports for connecting to a PLC or some
external device (Controller Connectors).
Cable
Requirements
Different cables are required for various devices.
Caution
Restrict cable length to less than 500’ (150m) for RS485/422
devices and 50’ (15m) for RS232 devices to avoid
communications problems.
Shielded cable must be used for long lengths or cables run in
an electrically noisy environment.
Do not run cables next to AC power lines or near sources of
electrical noise.
Be sure that the cable ends have been inserted all of the way
into mating connectors and are secure