Cs31 System Bus; Connection Of The Ac500 Cpu To The Cs31 System Bus Using Com1 Of The Terminal Base - ABB Advant AC500 Manual

1
2
120
3
Ohms
4
Slave at the
bus line end,
bus termination
120 Ohms
Figure: RS-485 bus with the master within the bus line
The following photo shows a wiring example "master within the bus line".
Figure: "Master within the bus line", wired at the COM1 bus connector of the Terminal Base
Attention: If the bus is operated with several masters, the pull-up and pull-down resistors may
only be activated at one master.
The earthing of the cable shields of the bus lines are described in the chapter "CS31 system bus" of the
AC500 system data.

CS31 system bus

Connection of the AC500 CPU to the CS31 system bus using COM1 of the Terminal Base

The AC500 CPU can be used as a CS31 bus master. The connection is performed via the serial
interface COM1 used as a CS31 system bus. The following drawing shows the connection of the bus
signals BUS1 and BUS2.
24 V
0 V
FE
BUS1
BUS2
Figure: AC500 CPU connected to the CS31 system bus via the serial interface COM1
____________________________________________________________________________________________________________
V2
AC500 Hardware
1
2
3
4
Master within
the bus line,
pull-up and
pull-down
activated
Supply voltage 24 V DC, 5-pole, terminals
L+ +24 V DC
L+ +24 V DC
M 0 V
M 0 V
FE FE
1 Term. P
2 RxD/TxD-P
3 RxD/TxD-N
4 Term. N
5 RTS
6 TxD
7 SGND
8 RxD
9 CTS
COM1 9-pole, terminals
1
2
3
4
Slave within
the bus line
UP
UP
ZP
ZP
Functional Earth
RS-485 Terminator P
RS-485 Receive/Transmit, positive
RS-485 Receive/Transmit, negative
RS-485 Terminator N
1-35 System data
1
2
120
3
Ohms
4
Slave at the
bus line end,
bus termination
120 Ohms
AC500 / Issued: 05.2007