Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 123
Chapter 4 Digital I/O Operation
Set RPI
The Connection tab on the Module Properties dialog box lets you enter a
requested packet interval (RPI). The RPI guarantees the slowest rate at which
data is multicast to the owner-controller.
The actual data transfer rate of the module can be faster than the RPI setting.
But, the RPI provides a defined, maximum period when data is transferred to
the owner-controller.
1. Choose from the options in the Connection tab.
2. Click OK.
Enable Change of State
The Point column (on the left side of the Configuration tab) lets you determine
whether a change of state occurs when a field device becomes Off to On or On
to Off.
Parameter Description
Requested Packet Interval (RPI) Enter an RPI value or use the default.
Inhibit Module
Check the box to prevent communication between the owner-controller and the
module. This option lets the module be maintained without faults being reported to
the controller.
Major Fault On Controller If Connection Fails While in Run Mode
Check the box to create a major fault if there is a connection failure with the module
while in Run mode.
For important information on this checkbox, see ‘Configure a Major Fault to Occur’ in
the Logix 5000â„¢ Controllers Information and Status Programming Manual, publication
1756-PM015
.
Use Unicast Connection over EtherNet/IP
Choose between Unicast and Multicast for EtherNet/IP connections. This checkbox is
enabled when the module supports Unicast at the current revision and any part of the
module path crosses EtherNet/IP.
It is checked and dimmed when the module supports only Unicast and any part of the
module path crosses the EtherNet/IP network.
The checkbox is not checked and dimmed if these conditions are true:
• The current revision of the module does not support Unicast. If a module is
Multicast only, no revision supports Unicast.
• The module is proxied (for example, 1734, 1738 and 1794 modules) and the current
revision of the parent does not support Unicast.
Unicast is not supported with ControlLogix® Redundancy, version 19.52. For more
details refer to Knowledge Base article 118315
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/118315
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