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Modbus Plus language objects
Implicit Exchange Language Objects Associated with the Application-Specific
Function
At a Glance
An integrated application-specific interface or the addition of a module automatically enhances the
language objects application used to program this interface or module.
These objects correspond to the input/output images and software data of the module or integrated
application-specific interface.
Reminders
The module inputs (%I and %IW) are updated in the PLC memory at the start of the task, the PLC
being in RUN or STOP mode.
The outputs (%Q and %QW) are updated at the end of the task, only when the PLC is in RUN mode.
NOTE: When the task occurs in STOP mode, either of the following are possible, depending on
the configuration selected:


outputs are set to fallback position (fallback mode)
outputs are maintained at their last value (maintain mode)
Figure
The following diagram shows the operating cycle of a PLC task (cyclical execution).
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35006188 10/2014