18 Rockwell Automation Publication 1769-UM022C-EN-P - June 2018
Chapter 1 System Overview
Controller Data Flow
Capabilities
Figure 1 explains the standard and safety data-flow capabilities of the Compact
GuardLogix controller.
Figure 1 - Data Flow Capabilities
No. Description
1 Standard tags and logic behave the same way they do in the standard Logix platform.
2 Standard tag data, program- or controller-scoped, can be exchanged with external HMI devices, personal
computers, and other controllers.
3 Compact GuardLogix controllers are integrated controllers with the ability to move (map) standard tag data
into safety tags for use within the safety task.
ATTENTION: This data must not be used to directly control a SIL 3/PLe
output.
4 Controller-scoped safety tags can be read directly by standard logic.
5 Safety tags can be read or written by safety logic.
6 Safety tags can be exchanged between safety controllers over an Ethernet network, including GuardLogix
5570 and Compact GuardLogix 5370 controllers.
7 Safety tag data, program- or controller-scoped, can be read by external devices, such as HMI devices,
personal computers, or other standard controllers.
IMPORTANT
Once this data is read, it is considered standard data, not SIL 3/PLe data.
Compact GuardLogix Controller
Standard Safety
Standard Tasks
Safety Tasks
Safety Programs
Standard Programs
Safety Routines
Standard Routines
Program Data
Program Safety Data
Controller Safety Tags
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4
1
2
2
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7
Controller Standard Tags
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