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Chapter 1
Overview of the POINT I/O ASCII Modules
10
detected, the owner-controller sends the configuration. One of the following
occurs:
•
If the configuration is appropriate to the module detected, a connection
is made and operation begins.
•
If the configuration is not appropriate to the module detected, the data is
rejected and the Studio 5000 Logix Designer application indicates that
an error occurred.
The configuration can be inappropriate for many reasons. For example, a
mismatch in electronic keying that helps prevents normal operation.
The owner-controller monitors its connection with a module. Any break in the
connection, for example, the loss of power to the backplane, causes a fault. The
Studio 5000 Logix Designer application monitors the fault status tags to
indicate when a fault occurs on a module.
Connection Types Available with POINT I/O ASCII Modules
When configuring an ASCII module, you must define the module. Connection
is a required parameter in the Module Definition. The choice determines what
data is exchanged between the owner-controller and the module.
Table 4
describes the connection types that you can use with an ASCII module.
Table 4 - Connections - POINT I/O ASCII Modules
Connection Type
Description
The module returns the following to the owner-controller:
Data
• General fault data
• Input data
When a Listen Only data connection is used, another controller owns the module.
Listen Only
A controller that makes a Listen Only connection to the module does not write configuration
for the module. It merely listens to the data exchanged with the owner-controller.
For more information on the connection choices available with ASCII module,
see the Studio 5000 Logix Designer application.
Requested Packet Interval
The Requested Packet Interval (RPI) is a configurable parameter that defines a
specific rate at which data is exchanged between the owner-controller and the
module.
You set the RPI value during initial module configuration and can adjust it as
necessary after module operation has begun. Valid RPI values are 2...750 ms.
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.
Rockwell Automation Publication 1734-UM009C-EN-P - August 2022
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