216 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 4 Input/Output Instructions (MSG, GSV, SSV, IOT)
Immediate Output (IOT)
The IOT instruction immediately updates the specified output data (output tag
or produced tag).
Operands:
Relay Ladder
Structured Text
The operands are the same as those for the relay ladder IOT instruction.
Description: The IOT instruction overrides the requested packet interval (RPI) of an output
connection and sends fresh data over the connection:
• An output connection is a connection that is associated with the output
tag of an I/O module or with a produced tag.
• If the connection is for a produced tag, the IOT instruction also sends the
event trigger to the consuming controller. This lets the IOT instruction
trigger an event task in the consuming controller.
To use an IOT instruction and a produced tag to trigger an event task in a
consumer controller, configure the produced tag as shown below.
Operand Type Format Description
Update Tag Tag Tag that you want to update, either:
· output tag of an I/O module
· produced tag
Do not choose a member or element of a tag. For
example, Local:5:0 is OK but Local:5:0.Data is not
OK.
Check this box.
This configures the tag to update its event trigger
only via an IOT instruction.
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