ABB Advant AC500 Manual page 37

120
Ohms
CS31
slave
Figure: Bus topology for a CS31 system bus at COM1 (bus master within the bus line)
1
2
120
3
Ohms
4
CS31 bus master
e.g. PM581
Master at the
bus line end,
pull-up and
pull-down
activated
bus termination
120 Ohms
Figure: Wiring with spur lines is not allowed
____________________________________________________________________________________________________________
V2
AC500 Hardware
Master within
the bus line,
pull-up and
pull-down
activated
CS31 system bus
COM1
WRONG!
Spur lines are not
allowed.
CS31
system bus
CS31
slave
1
COM1
2
CS31 bus master
3
e.g. PM581
4
direct
earthing
with clip
CS31 system bus
CS31
slave
1-37 System data
120
Ohms
CS31
slave
RIGHT!
Bus line is looped through
from module to module.
AC500 / Issued: 05.2007