Atlas Copco PowerMACS 4000, User Manual

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PLC
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5.3.7 Globals
These variables are used to transfer information from one station PLC to another station PLC. All stations
can reach these global variables.
Variable Type Use
SYSTEMGLOBAL INT For communication between PLCs on different stations.
The variables are declared as a shared memory and can therefore both be read and written to both by the
PowerMACS System and the PowerMACS PLC.
You should see to that only one station write to a given variable but any number of stations can read it.