Allen-Bradley 1756 Series, User Manual, Page: 36 / 136

36 Rockwell Automation Publication 1756-UM013B-EN-P - October 2019
Chapter 1 Digital Safety I/O Module Operation in a Control System
Protected Operations
To maintain the secure operation of your safety I/O modules, operations that can
disrupt module operation are restricted based on the module operating mode.
Table 5 describes the restrictions.
Table 5 - Protected Operations on safety I/O modules
Current Module Operation
Activity
Firmware
Update
Request Module Reset
Request Connection
Request Configuration
Change Connection or
Data Format
Change Electronic
Keying
Change RPI Change
Connection not running Accepted
Connection running Rejected Accepted
(1)
Accepted
(2)
Not allowed
(3)
Accepted
(4)
Firmware update is in process Rejected
(1) Only requests for Listen Only connections are accepted.
(2) Configuration change is accepted in the following scenarios:
- Changes are made in the Module Properties dialog box and you click Apply.
- Changes are made in the Configuration tags and you send a Reconfigure Module MSG to the module.
(3) The difference between Rejected and Not allowed is that rejected activities can be attempted in the Logix Designer application but do not take effect. The activities that are not allowed, that is,
attempts to change the Connection or Data Format used, do not occur in the Logix Designer application.
For example, if you attempt to reset a module that is connected to the owner-controller, the Logix Designer application executes the request and alerts you that it was rejected. If you attempt to
change the data format on a module that is connected to an owner-controller, the Logix Designer application does not execute the attempted change. The application only alerts you that the change
is not allowed. In the case, if the change is attempted online, the Module Definition dialog box field that changes the data format is disabled.
(4) The change occurs after the connection is closed and reopened. You can close and reopen the connection in the following ways:
- Change the project while it is offline and download the updated project before going online again.
- Change the project while it is online and click Apply or OK in the Module Properties dialog box. In this case, before the change is made, a dialog box alerts you of the ramifications before the change
is made.