Technical data
50 Rockwell Automation Publication 1769-TD005I-EN-P - August 2014
CompactLogix Controllers Specifications
Compact GuardLogix Safety System
The Compact GuardLogix
®
controller is a 1768-L4xS CompactLogix controller that provides safety control to achieve
SIL 3/PLe according to ISO 13849. A major benefit of this system is that it’s still one project, safety, and standard together.
During development, safety and standard have the same rules. The following are allowed:
• Multiple programmers
• Online editing
• Forcing
Once the project is tested and ready for final validation, you apply the safety application signature and safety-lock the
application to set the safety task to a SIL 3 integrity level, which is then enforced by the GuardLogix controller. When
safety memory is locked and protected, the safety logic can't be modified and all safety functions operate with SIL 3
integrity. On the standard side of the GuardLogix controller, all functions operate like a regular Logix controller. Thus
online editing, forcing, and other activities are all allowed.
With this level of integration, safety memory can be read by standard logic and external devices, like HMIs or other
controllers, removing the need to condition safety memory for use elsewhere. The result is easy system-wide integration and
the ability to display safety status on displays or marquees. Use Guard I/O
™ modules for field device connectivity. For
safety interlocking between GuardLogix controllers use Ethernet or ControlNet networks. Multiple GuardLogix
controllers can share safety data for zone to zone interlocking, or one GuardLogix controller can use remote distributed
safety I/O between different cells/areas.
Application Description
SIL 1, 2, 3 The Compact GuardLogix controller system is type-approved and certified for use in safety applications up to and
including SIL 3 according to IEC 61508, and applications up to and including PLe/Cat.4 according to ISO 13849-1. For
more information, see the following:
• GuardLogix Controllers Systems Safety Reference Manual, publication 1756-RM093
• Compact GuardLogix Controllers User Manual, publication 1768-UM002
• GuardLogix Safety Application Instruction Set Reference Manual, publication 1756-RM095