20 Rockwell Automation Publication 1732E-UM001A-EN-P - December 2019
Chapter 2 Configure and Startup
You set the RPI value during initial module configuration and can adjust it as
necessary after module operation has begun. Valid RPI values are 1…750 ms.
For more information on guidelines for specifying RPI rates, see the
Logix5000 Controllers Design Considerations Reference Manual, publication
1756-RM094
.
Inhibit Module
When you inhibit a module, you indefinitely suspend a connection between an
owner-controller and the 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 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.
IMPORTANT If you change the RPI while the project is online, the connection to the module
is closed and reopened in one of the following ways:
• You inhibit the connection to the module, change the RPI value, and
uninhibit the connection.
• You change the RPI value. In this case, the connection is closed and
reopened immediately after you apply the change to the module
configuration.
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