Automatic control function programming manual ladder language

3.9 %S Common Word Variables
When the CNC is connected to MAPWAY or ETHWAY networks, it allows access to the common words of the
Telemecanique TSX PLCs. The set of common words forms a data base shared by the stations of a network in which
each station can be a TSX PLC or a numerical control.
The stations included in the common word service share a common memory of 256 words x 16 bits.
Depending on the configuration, each station is allocated from 4 to 64 common words (accessible for write) of the
common memory. It has read-only access to the words assigned to the other stations.
3.9.1 Variable Update
The %S variables are updated automatically by the system at the rate of sequential task %TS0, without action by the
user programme.
At the start of %TS0, the automatic control function reads all the common words updated in the other stations in the
interface associated with the network processor.
At the end of %TS0, the automatic control function writes the common words of its station in the interface associated
with the network processor.
The network controller compares these values with the values sent before. It only sends a frame if at least one of the
values has been updated or after 30 RTC cycles if it has not transmitted since.
3.9.2 Setting up the Common Words
Setting up consists of:
- defining the network and station numbers in machine parameter P100 (see Parameter Manual),
- programming the station activity and the number of common words per station in task %INI by calling function
setcomw(..).
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