Rockwell Automation Publication 1715-RM001A-EN-P - June 2019
7
Chapter
1
The ControlLogix/1715 SIL 2 System
Overview
A ControlLogix® SIL 2 system consists of a standard ControlLogix controller
with proper SIL 2 approved firmware, field connections, 1715 I/O modules with
proper SIL 2 approved firmware, power sources, and network connections. This
system is not a GuardLogix® controller system. The flexibility of the design means
that a system can meet a wide variety of business needs while maintaining a
desirable level of commonality and or simplicity. This is known as a configured
safety system, meaning the control system must be configured in a specific
manner to meet SIL 2 requirements. This tips guide helps introduce the primary
components that can be used to assemble a ControlLogix/1715 SIL 2 Safety
System.
The 1715 I/O system takes much the configuration work out of the
ControlLogix SIL 2 system. Since the I/O was specifically designed to operate in
a safety system, there is no longer any need for special wiring or IFMs to use
ControlLogix in a SIL 2 manner. Either or Both the I/O system or controller
system can be simplex or duplex, making the system scalable to fit the customer's
application.
ControlLogix Controllers
Simplex ControlLogix Controller
The following components are needed for a Simplex ControlLogix controller.
Redundancy is not required for SIL 2.
For hardware selection, refer Appendix B of
Applications Safety Reference Manual (1756-RM001)
for the SIL2-certified
ControlLogix catalog/revision numbers.
• 1756 Chassis
• Power Supply
– If the 1756-PA75 or 1756-PB75 power supply is used with a Series B
controller, the Series B version of the power supply must be used (1756-
PA75/B or 1756-PB75/B)
• 1756-L7x Controller
• EtherNet/IP communication card
– Use of a 1756-EN2TR or 1756-EN2TRXT is required to achieve
SIL 2 in the application. EN2TR is the only communication module
Rockwell Automation will continue to certify for ControlLogix SIL 2
safety functions in the future
TIP
Redundancy can be selected for availability if needed.
