42 Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
Chapter 5 Characteristics of Safety Tags, the Safety Task, and Safety Programs
A typical SIL 3 wiring diagram is shown in Figure 15.
Figure 15 - SIL 3 Wiring
Use of Human Machine
Interfaces
Follow these precautions and guidelines for using HMI devices in SIL-rated
GuardLogix systems.
Precautions
You must exercise precautions and implement specific techniques on HMI
devices. These precautions include, but are not restricted to the following:
• Limited access and security
• Specifications, testing, and validation
• Restrictions on data and access
• Limits on data and parameters
For more information on how HMI devices fit into a typical SIL loop, see
GuardLogix Architecture on page 11
.
Use sound techniques in the application software within the HMI and
controller.
IMPORTANT These wiring drawings are examples of possible wiring configurations.
Depending on your I/O device and system configuration, other wiring
configurations can also be used.
IMPORTANT The onboard pulse test outputs (T0…Tx) are typically used with field
devices that have mechanical contacts. If a safety device that has electronic
outputs is used (to feed safety inputs), they must have the appropriate
safety ratings.
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