Rockwell Automation Publication 5094-UM001C-EN-P - April 2019 49
Common Digital I/O Module Features Chapter 2
Module Inhibiting
Module inhibiting lets you indefinitely suspend a connection, including Listen
Only connections, between an owner-controller and a digital I/O module
without removing the module from the configuration. This process lets you
temporarily disable a module, such as to perform maintenance.
You can use module inhibiting in the following ways:
• You write a configuration for an I/O module but inhibit the module to
help prevent it from communicating with the owner-controller. The owner
does not establish a connection and the configuration is not sent to the
module until the connection is uninhibited.
• In your application, a controller already owns a module, has downloaded
the configuration to the module, and is exchanging data over the
connection between the devices.
In this case, you can inhibit the module and the connection to the module
does not exist.
You can use module inhibiting in these instances:
• You want to update a digital I/O module, for example, update the module
firmware revision. Use the following procedure.
a. Inhibit the module.
b. Perform the update.
c. Uninhibit the module.
• You use a program that includes a module that you do not physically
possess yet. You do not want the controller to look for a module that does
not yet exist. In this case, you can inhibit the module in your program until
it physically resides in the proper slot.
To see where to inhibit a FLEX 5000 digital I/O module, see
page 120.
STATUS
POWER
SAFETY DIGITAL 16 INPUT 24 VDC
5094-IB16S
5
5
TB3I
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STATUS
POWER
DIGITAL 16 INPUT 24 VDC
5094-IB16
1
1
TB3
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Safety Modules
Standard Modules
IMPORTANT You cannot inhibit a connection when the controller is safety-locked or a
safety signature exists for the controller.
IMPORTANT Whenever you inhibit an output module that is ProgMode enabled,
it enters Program mode, and all outputs change to the state
configured for Program mode.
For example, if an output module is configured so that the state of
the outputs transition to zero during Program mode, whenever that
module is inhibited, outputs transition to zero.
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