Rockwell Automation 1756-SPESMNRMXT GuardLogix Controllers User Manual - Manuel (Page 19)

Rockwell Automation Publication 1756-UM020I-EN-P - August 2012 19
System Overview Chapter 1
view the contents of a memory card if one was installed in the primary controller.
Prior to version 16, memory cards were not supported.
See Chapter 8 , Store and Load Projects Using Nonvolatile Memory , for more
information.
A three-position keyswitch on the front of the primary controller governs the
controller operational modes. The following modes are available:
• RUN
• PROGram
• REMote - this software-enabled mode can be Program, Run, or Test
Figure 2 - Keyswitch Positions
Safety Partner
The safety partner is a coprocessor that provides an isolated second channel
(redundancy) for safety-related functions in the system.
The safety partner does not have a keyswitch or communication port. Its
configuration and operation are controlled by the primary controller.
Chassis
The ControlLogix chassis provides physical connections between modules and
the GuardLogix controller.
Power Supply
The ControlLogix power supplies listed on page 27 are suitable for use in SIL 3
applications. No extra configuration or wiring is required for SIL 3 operation of
the power supplies.
1756-L6xS
OK FORCE SD RUN
Logix557x
RU N REM PROG
1756-L7xS