1756-L71 1756 ControlLogix Controllers Allen Bradley

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Essential details：1756-L71 1756 ControlLogix Controllers Allen Bradley

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The ControlLogix® controller provides a scalable controller solution that is capable of addressing a large amount of I/O points. The ControlLogix controller can be placed into any slot of a ControlLogix I/O chassis and multiple controllers can be installed in the same chassis. ControlLogix controllers can monitor and control I/O across the ControlLogix backplane, as well as over network links. To provide communication for a ControlLogix controller, install the appropriate communication interface module into the chassis.

1756-L71

A GuardLogix® controller is a ControlLogix controller that also provides safety control. The GuardLogix system is a dual controller solution—you must use a 1756-L6xS/1756-L7xS primary controller and a 1756-LSP/1756-L7SP safety partner to achieve up to SIL CL 3/PLe/Cat. 4. A major benefit of this system is that it’s still a single project, safety and standard together. The safety partner controller is a part of the system, is automatically configured, and requires no user setup.
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 CL 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, eliminating 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 on Ethernet or DeviceNet networks, and for safety interlocking between GuardLogix controllers use Ethernet or ControlNet networks. Multiple GuardLogix controllers can share safety data for zone to zone interlocking, or a single GuardLogix controller can use remote distributed safety I/O between different cells/areas.
In addition to the standard features of a ControlLogix controller, the GuardLogix controller has these safety-related features.

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