ABB AC500 PLC - Bus Cable for RS-485

Pin Signal Interface Description
1
9
1 Term. P RS-485 Terminator P
2 RxD/TxD-P RS-485 Receive/Transmit, positive
3 RxD/TxD-N RS-485 Receive/Transmit, negative
4 Term. N RS-485 Terminator N
5 RTS RS-232 Request to send (output)
6 TxD RS-232 Transmit data (output)
7 SGND Signal Ground Signal Ground
8 RxD RS-232 Receive data (input)
9 CTS RS-232 Clear to send (input)
Table 18: Protocols:
No. Protocol Description
COM1
1 Online access Online access for IEC 61131-3 programming via serial driver
2 Modbus Modbus RTU, master or slave
3 ASCII Any protocol with FB COM_SEND, COM_REC
4 SysLibCom Support for blocks contained in the SysLibCom.lib library
5 Multi Switch between two protocols (Online access, Modbus, ASCII,
SysLibCom) using the block COM_SET_PROT
6 CS31 bus CS31 bus master
7 RCOM/RCOM+ ABB remote protocol RCOM or RCOM+ (only available as sepa-
rate communication module CM574-RCOM)
COM2
1 Online access Online access for IEC 61131-3 programming with serial driver
2 Modbus Modbus RTU, master or slave
3 ASCII Any protocol with FB COM_SEND, COM_REC
4 SysLibCom Support for SysLibCom.lib library blocks
5 Multi Switch between two protocols (Online access, Modbus, ASCII,
SysLibCom) using the block COM_SET_PROT
Bus Cable for RS-485
Bus line
Construction 2 cores, twisted, with common shield
Conductor cross section > 0.22 mm² (24 AWG)
Twisting rate > 10 per meter (symmetrically twisted)
Core insulation Polyethylene (PE)
Resistance per core < 100 Ω/km
Characteristic impedance ca. 120 Ω (100 Ω...150 Ω)
Capacitance between the cores < 55 nF/km (if higher, the max. bus length must be reduced)
Terminating resistors 120 Ω ¼ W at both line ends
Device Specifications
Communication Modules (AC500 Standard) > CM574-RCOM for RCOM/RCOM+
2019/04/173ADR010121, 13, en_US96