CompactLogix System

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Introduction Environmentals and Certifications 1769 Packaged Controllers with Embedded I/O 1769 Modular Controllers
CompactLogix 5370 Controllers 1768 CompactLogix Controllers 1768 GuardLogix Controllers Accessories—Controllers
1768 GuardLogix Controllers

Click to enlarge - Guard4x_photo

The Compact GuardLogix controller is a 1768-L4xS CompactLogix controller that provides safety control up to and including SIL 3 according to IEC 61508, and applications up to and including PLe/Cat.4 according to ISO 13849-1.

Safety and standard tasks have the same rules during project development—multiple programmers, online editing, and forcing are all allowed. Once the project is tested and ready for final validation, the Safety Task is set to SIL 3, which is then enforced by the GuardLogix controller. When safety memory is locked and protected, the safety logic cannot be modified and all safety functions operate with SIL 3. 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.

Ethernet or ControlNet networks can be used for safety interlocking between GuardLogix controllers. 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. Field device connectivity can be established over Ethernet or DeviceNet networks.

For additional information on GuardLogix refer to GuardLogix Integrated Safety System.

1768 GuardLogix Features

The 1768-L4xS system provides


Specifications [PDF]

Characteristic 1768-L43S 1768-L45S
User Memory 2 MB standard
0.5 MB safety
3 MB standard
1 MB safety
CompactFlash card • 1784-CF64
• 1784-CF128
• 1784-CF64
• 1784-CF128
Communication Options • EtherNet/IP (standard and safety)
• ControlNet (standard and safety)
• DeviceNet (standard)
• EtherNet/IP (standard and safety)
• ControlNet (standard and safety)
• DeviceNet (standard)
Serial communication port 1 RS-232 serial port 1 RS-232 serial port
Module expansion capacity • 2 - 1768 modules
• 16 - 1769 modules
• 4 - 1768 modules
• 30 - 1769 modules
Power supply distance rating
Programming languages • Standard task: all languages
• Safety task: relay ladder, safety application instructions
• Standard task: all languages
• Safety task: relay ladder, safety application instructions