Implicit Exchange Language Objects Associated with the Application-Specific Function
(Original Document)
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At a Glance
Use of 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, or when the PLC is 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 is 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).
Illustration
The diagram below shows the operating cycle of a PLC task (cyclical execution):