ABB AC500 PLC - 1.8.1.10.4 Technical Data

CS31
Slave
RxD/TxD-P RxD/TxD-N
Shield
CS31
Slave
RxD/TxD-P RxD/TxD-N
Shield
120 Ω120 Ω
1
2
3
4
5
1
2
1 Master at the bus line end, pull-up and pull-down activated, bus termination with 120 W
resistors
2 Direct grounding via clip or steel plate
NOTICE!
Risk of EMC disturbances!
Unshielded cables may cause EMC disturbances.
Always use shielded cables and connect the shield at every device.
1.8.1.10.4 Technical Data
Parameter Value
Physical link RS-485
Electrical Isolation Yes
Usage / Supported protocols Modbus (Master and Slave)
CS31 (Master only)
Supported baudrates [baud]
Modbus 9.6 k, 14.4 k, 19.2 k, 38.4 k and 187.5 k
CS31 system bus 187.5 k
Connector at the communication line 5-pin screw terminal block
Connector at PM554 or PM564 D-sub 9, male
Cable type and specification Twisting rate minimum 10 per meter, with
common shield
Capacitance between the cores: < 55 nF/km
Characteristic impedance: 120 W
Recommended cable cross section Conductor cross section 0.5 mm²
Resistance per core: < 40 W/km
Thinnest cable cross section Conductor cross section 0.22 mm²
Resistance per core: < 100 W/km
Max. cable length for Modbus
at 38.4 kBaud or below 1200 m with cable cross section 0.5 mm² or
400 m with cable cross section 0.22 mm²
at 187.5 kBaud 500 m with cable cross section 0.5 mm² or 400
m with cable cross section 0.22 mm²
Device Specifications
Accessories > AC500-eCo
2019/04/173ADR010121, 13, en_US1144