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MELSEC-Q
3 SPECIFICATIONS
POINT
In configurations that use multiple master stations (multimaster configuration),
when reconnecting a cable after disconnecting a PROFIBUS cable for 1 master
that is exchanging data at a low baud rate, the communications of the master for
which the cable is not disconnected could stop and the slave output could be
turned off. To prevent this, the master PROFIBUS cable must be secured with a
screw.
In addition, there is a high possibility that the above phenomena can be avoided if
care is taken with the following points when configuring a system.
(1) Set the slave watchdog timer setting value to larger than (TTr
×
G)/BR.
However,
T
T
r :
Target token rotation time (Unit: Bit Time)
G :
Gap update factor
BR :
Baud rate (Unit: bps)
(2) Use a high baud rate.
(3) The HSA (Highest Station Address) value is made to match the maximum
station No. that is actually connected.
