Rockwell Automation 2080-LC20-20QBBR Micro820 20-point Programmable Controllers User Manual - Manual (Page 24)

16 Rockwell Automation Publication 2080-UM005A-EN-E - December 2013
Chapter 2 About Your Controller
• Install emergency-stop switches and the master control relay in your
system. Make certain that relay contacts have a sufficient rating for your
application. Emergency-stop switches must be easy to reach.
• In the following illustration, input and output circuits are shown with
MCR protection. However, in most applications, only output circuits
require MCR protection.
The following illustrations show the Master Control Relay wired in a grounded
system.
TIP
In most applications input circuits do not require MCR protection;
however, if you need to remove power from all field devices, you must
include MCR contacts in series with input power wiring.