GuardLogix Controllers

A GuardLogix controller is a ControlLogix processor that is used in safety control. The GuardLogix system comes with a dual processor solution. You need to use a GuardLogix L6 controller with a 1756-LSP safety partner or a GuardLogix L7 controller with a 1756-L7SP safety partner to Achieve SIL 3 and Cat. 4/PLe.

A major advantage is a single project, safety and standard combined together. No user setup is required as the safety partner is a part of the system and is automatically configured.

During development, safety and standard have the same rules, multiple programmers, online editing, and forcing are all allowed. Once the project is tested and ready for final validation, you 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.

Safety memory can be read by standard logic and external devices with this type of integration.  This includes Controllers and HMIs, reducing the need to condition safety memory for use elsewhere. The result is an easy system-wide integration and the ability to display safety status on displays or marquees.

Guard I/O modules can be used for field device connections on Ethernet or DeviceNet networks, and for safety between GuardLogix using Ethernet or ControlNet networks. Many 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.