Installation manual
CNC 8035
7.
INTRODUCTION TO THE PLC
Modular structure of the program
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·294·
7.4.3 Periodic execution module (PE t)
This module is optional and will be executed every period of time t indicated in the directing
instruction defining the module.
This module may be used to process certain critical inputs and outputs which cannot be checked
or updated properly in the body of the main program due to its extended execution time.
Another application for this module is for those cases where specific tasks need not be evaluated
at every PLC program cycle. Those tasks would be programmed in the periodic module and they
would be executed with the frequency established by the execution time assigned to this module
(for example: if t= 30,000; every 30 seconds).
A “t” value between 1 and 65535 milliseconds may be programmed.
The execution time of this module will be limited by the value of plc.m.p. WDGPER (P1)
This module operates by default with the real values of resources I, O, M.
Example:
If this module is being executed with real values and acts on a physical output, this is updated at
the end of the execution of the periodic module.
PE 10 Defines the beginning of the periodic module PE which will be executed every 10
milliseconds.
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