Allen-Bradley Logix5000 Reference Manual page 217

With this controller
ControlLogix
SoftLogix5800
EtherNet/IP Network
Values loaded into
produced tag
IOT instruction in the
producing controller
Event task in the
consuming controller
Arithmetic Status Flags:
Fault Conditions:
Condition
Prescan
Rung-condition-in is false
Rung-condition-in is true
EnableIn is set
Instruction execution
Postscan
The type of network between the controllers determines when the consuming
controller receives the new data and event trigger via the IOT instruction.
Over this network
Backplane
EtherNet/IP network
ControlNet network
You can produce and consume tags only over a
ControlNet network.
The following diagrams compare the receipt of data via an IOT instruction over
EtherNet/IP and ControlNet networks.
Not affected
None
Execution:
Relay Ladder Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
The instruction executes.
The rung-condition-out is set to true.
N/A
The instruction:
· updates the connection of the specified tag.
· resets the RPI timer of the connection.
The rung-condition-out is set to false.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Input/Output Instructions (MSG, GSV, SSV, IOT)
The consuming device receives the data and
event trigger
Immediately
Immediately
Within the actual packet interval (API) of the
consumed tag (connection)
Within the actual packet interval (API) of the
consumed tag (connection)
ControlNet Network
Values loaded into
produced tag
IOT instruction in the
producing controller
RPI of the produced tag
Event task in the
consuming controller
Structured Text Action
No action taken.
N/A
N/A
EnableIn is always set.
The instruction executes.
No action taken.
Chapter 4
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