Rockwell Automation 1756-L7x GuardLogix 5570 Controllers - Manual (Page 13)

Rockwell Automation Publication 1756-UM022A-EN-P - November 2012 13
System Overview Chapter 1
Controller Data Flow
Capabilities This illustration explains the standard and safety data-flow capabilities of the
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 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 Ethernet or ControlNet networks, including 1756
and 1768 GuardLogix 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.
Standard Safety
Standard Tasks
Safety Task
Safety Programs
Standard Programs
Standard Routines
Program Data
Program Safety Data
Safety Routines
Controller Standard Tags Controller Safety Tags
GuardLogix Controller