Language objects
Introduction to implicit exchanges
At a Glance
Reminders
Illustration
These objects allow you to access inputs and software information for the application-specific function concerned.
The addressing system for words and bits is given in the Common application-specific functions section.
The images (%I and %IW) of entries to the module are updated in the processor at the beginning of the task cycle, in RUN or STOP mode.
Output commands (%Q and %QW) are updated in the module at the end of the task cycle, only when this is in RUN mode.
xy represents the position of the module, i represents the channel number (counted from 0) in the module.
The diagram below illustrates the operation cycle relating to a PLC task (cyclic execution).
Internal processing
Acquisition of input
RUN STOP
Program processing
Update output
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