Safe State - Allen-Bradley 1756 Series User Manual

Chapter 1 Digital Safety I/O Module Operation in a Control System
18

Safe State

ATTENTION:
• The safe state of the outputs is defined as the off state.
• The safe state of the module and its data is defined as the off state.
• Use the 1756 ControlLogix digital safety I/O modules only in applications
where the off state is the safe state.
The following are the safe states of the safety modules:
• Safety outputs: OFF
• Safety input data to network: OFF
Figure 1 - Safety Status
Networks
Output OFF
The modules are designed for use in applications where the safe state is the
off state.
IMPORTANT If you inhibit a safety module from transitioning to a safe state when a fault
occurs because an I/O connection is lost, you accept responsibility for any
consequences that result from your decision to inhibit.
We recommend that you use other means to maintain the safe state if you
inhibit the safety module from transitioning to a safe state.
Rockwell Automation Publication 1756-UM013B-EN-P - October 2019
Input to Networks OFF
Safety Status
Input