Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 94)

Chapter
6
Publication 2706–816
Remote I/O and RSĆ232
Connections
This chapter covers the following topics:
•
Wiring and safety guidelines
•
Communication ports
•
Remote I/O Port connections
•
RS-232 Port connections
•
Compatible devices
•
Compatible controllers.
Connect the MessageView terminal to the devices it will be using in
the system, using publication NFPA 70E, Electrical Safety
Requirements for Employee Workplaces. In addition to the NFPA
general guidelines, we have added some specific recommendations:
•
Careful wire routing helps reduce or minimize electrical noise.
Route incoming power to the terminal by a separate path from the
communications cables.
•
Do not run communications wiring and power wiring in the same
conduit.
•
Where communications and power wiring must cross, make their
intersection perpendicular.
•
Proper grounding helps to limit the effects of noise due to
Electromagnetic Interference (EMI). To avoid problems caused
by EMI, all cables must be shielded and grounded at both ends.
Grounding is also an important safety measure in electrical
installations.
A source for grounding recommendations is the National Electrical
Code published by the National Fire Protection Association of
Boston Massachusetts.
Wiring and Safety
Guidelines