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Controller data flow capabilities, Standard safety, Compact guardlogix controller – Rockwell Automation 1768-L45S Compact GuardLogix Controllers User Manual

Page 13

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Rockwell Automation Publication 1768-UM002C-EN-P - April 2012

13

System Overview

Chapter 1

Controller Data Flow
Capabilities

This illustration 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 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

Compact GuardLogix Controller

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