Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 217
Input/Output Instructions (MSG, GSV, SSV, IOT) Chapter 4
The type of network between the controllers determines when the consuming
controller receives the new data and event trigger via the IOT instruction.
The following diagrams compare the receipt of data via an IOT instruction over
EtherNet/IP and ControlNet networks.
Arithmetic Status Flags: Not affected
Fault Conditions: None
Execution:
With this controller Over this network The consuming device receives the data and
event trigger
ControlLogix Backplane Immediately
EtherNet/IP network Immediately
ControlNet network Within the actual packet interval (API) of the
consumed tag (connection)
SoftLogix5800 You can produce and consume tags only over a
ControlNet network.
Within the actual packet interval (API) of the
consumed tag (connection)
EtherNet/IP Network ControlNet Network
Event task in the
consuming controller
Values loaded into
produced tag
IOT instruction in the
producing controller
Event task in the
consuming controller
Values loaded into
produced tag
IOT instruction in the
producing controller
RPI of the produced tag
Condition Relay Ladder Action Structured Text Action
Prescan The rung-condition-out is set to false. No action taken.
Rung-condition-in is false The rung-condition-out is set to false. N/A
Rung-condition-in is true The instruction executes.
The rung-condition-out is set to true.
N/A
EnableIn is set N/A EnableIn is always set.
The instruction executes.
Instruction execution The instruction:
· updates the connection of the specified tag.
· resets the RPI timer of the connection.
Postscan The rung-condition-out is set to false. No action taken.
To Next Page
Loading...
Need help?
General
