Removal And Insertion Under Power; Chapter Summary And What's Next - Rockwell Automation Allen-Bradley ControlLogix 1756-HSC User Manual

Removal and Insertion
Under Pow er
Chapter Summary
and W hat's Next
These modules are designed to be installed or removed while chassis
power is applied.
When you insert or remove a module while
ATTEN TION
backplane power is applied, an electrical arc may
occur. An electrical arc can cause personal injury
!
or property damage by:
•
sending an erroneous signal to your system's
field devices causing unintended machine
motion or loss of process control.
•
causing an explosion in a hazardous
environment.
Repeated electrical arcing causes excessive wear to
contacts on both the module and its mating
connectors. Worn contacts may create electrical
resistance that can affect module operation.
In this chapter you learned about:
•
what the ControlLogix HSC module is
•
using the HSC module in the ControlLogix system
•
preventing electrostatic discharge
•
removing and inserting the module under power
Move on to Chapter 2 to learn about High Speed Counter operation
within the ControlLogix system.
What is the ControlLogix High Speed Counter M odule?
Publication 1756-UM 007A-EN-P - October 2000
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