58 Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
Chapter 6 Safety Application Development
Inhibit a Device
You cannot inhibit or uninhibit Safety I/O devices or producer controllers if
the application program is safety-locked or a safety signature exists. Follow
these steps to inhibit a specific safety I/O device.
1. In the Studio 5000 Logix Designer application, right-click the device
and choose Properties.
2. On the Module Properties dialog box, click the Connection tab.
3. Check Inhibit Connection and click Apply.
The device is inhibited whenever the checkbox is checked. If a
communication device is inhibited, all downstream devices are also
inhibited.
Online Editing
Standard logic online editing is unaffected by the safe state.
Safety logic online editing can only be performed when the controller is safety-
unlocked and unsigned. Follow these guidelines for editing safety logic online:
• If the controller is locked with safety edits, you must unlock the
controller to assemble or cancel the edits.
• For safety routines, the controller cannot be locked when there is a
pending edit, but it can be locked when there is a test edit.
• When changing the instruction configuration parameters of an existing
safety instruction, you must transition the controller to Program mode
and back to Run mode before the changes take effect.
You cannot edit standard or safety Add-On Instructions while online.
TIP Online edits in standard routines are unaffected by the safety-locked or
safety-unlocked state.
ATTENTION: Performing an online modification (to logic, data, or
configuration) can affect the Safety Function of the system if the
modification is performed while the application is running. Online
modifications should only be done if absolutely necessary. If the
modification is not performed correctly, it can stop the application.
Therefore, before performing an online modification, alternative safety
measures must be used during the update.
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