Allen-Bradley GuardLogix 5570, User Manual

Page: 17 / 172

Rockwell Automation Publication 1756-UM022D-EN-P - May 2017 17
System Overview Chapter 1
A three-position key switch 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 - Key Switch 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 key switch 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 26 are suitable for use in SIL 3
applications. No extra configuration or wiring is required for SIL 3 operation
of the power supplies.
Select Safety I/O Device
Safety input and output devices, like sensors and actuators, can be connected to
safety I/O on DeviceNet™ or EtherNet/IP™ networks. This connection
controls output devices by a GuardLogix controller system via DeviceNet or
EtherNet/IP communication.
For the most up-to-date information on available safety I/O catalog numbers,
certified series, and firmware revisions, see the safety certificates at
http://www.rockwellautomation.com/rockwellautomation/certification/
safety.page
.
OK FORCE SD RUN
Logix557x
RU
N REM PROG
1756-L7 x S