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Software installation 2
2.2-6 System bits and words
The user program utilizes five system bits for testing the correct operation of the network.
These are bits SY11 to SY15.
System
bits
Description
Function
SY11
Updating of
COM words
produced
Normally at 0, this bit is set to 1 when a local station has
transmitted its COM words on the FIPWAY network.
This bit must be reset to 0 by the program or the terminal so
that other transmissions of common words can be checked.
SY12
Network A
operating
Normally at 0, this bit is set to 1 when the local station
module is communicating with at least one other station
on the network. It does not indicate that all stations are
operating. This bit is set to 0 if there is a module fault.
SY13
Network B
operating
Idem SY12
SY14
Network C
operating
Idem SY12
SY15
Network D
operating
Idem SY12
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