26 Rockwell Automation Publication 5094-UM001C-EN-P - April 2019
Chapter 1 Digital I/O Module Operation in a Logix 5000 Control System
Connections for Standard
I/O Modules
During module configuration, you must define the module. Among the Module
Definition parameters, you must choose a connection type for the module. A
connection is a real-time data transfer link between the owner-controller and the
module that occupies the slot that the configuration references.
When you download module configuration to a controller, the controller
attempts to establish a connection to each module in the configuration.
Because part of module configuration includes a slot in the FLEX 5000 I/O
system, the owner-controller checks for the presence of a module there. If a
module is 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 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 FLEX 5000 I/O system, causes
a fault. The Logix Designer application monitors the fault status tags to indicate
when a fault occurs on a module.
Requested Packet Interval
The Requested Packet Interval (RPI) is a configurable parameter that defines a
rate at which the owner-controller and the module exchange data. You set the
RPI value during initial module configuration and can adjust it as necessary after
module operation has begun. The following are valid RPI values:
• FLEX 5000 I/O standard modules: 0.2…750 ms
For more information on guidelines for specifying RPI rates, see the Logix 5000
Controllers Design Considerations Reference Manual,
publication 1756-RM094
.
IMPORTANT You can change the RPI while the project is online. If you change the RPI
while the project is online, however, 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.
STATUS
POWER
DIGITAL 16 INPUT 24 VDC
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STATUS
POWER
DIGITAL 16 INPUT 24 VDC
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FLEX 5000
TM
I/O
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