Electronic Keying - Rockwell Automation Allen-Bradley 1734-232ASC Original Instructions Manual

Electronic Keying

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.
IMPORTANT Whenever you inhibit an output module that is ProgMode enabled, it
You can use module inhibiting in these instances:
• You want to update an analog 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 POINT I/O ASCII module, see
on page 18.
Electronic Keying reduces the possibility that you use the wrong device in a
control system. It compares the device that is defined in your project to the
installed device. If keying fails, a fault occurs. These attributes are compared.
Attribute Description
Vendor The device manufacturer.
Device Type The general type of the product, for example, ASCII module.
Product Code The specific type of the product. The Product Code maps to a catalog number.
Major Revision A number that represents the functional capabilities of a device.
Minor Revision A number that represents behavior changes in the device.
Rockwell Automation Publication 1734-UM009C-EN-P - August 2022
Chapter 1
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.
Overview of the POINT I/O ASCII Modules
Connection Category
13