ABB 07AC91 - Page 99

Advant Controller AC 31 / Issued: 01.99 6 – 5 Communication
3
40 or 50 series
Programming
mode:
ACTIVE MODE
ASCII mode:
PASSIVE MODE
MODBUS

mode
Figure 5: Communications protocols for 40 and 50 series devices
40 or 50
series
MODBUS protocol
RS232 line
Figure 6: Point to point connection with a PC
40 or 50
series
MODBUS protocol
RS485 line
40 or 50
series
40 or 50
series
Figure 7: Network connection with a PC
MODBUS protocol
RS485 line
40 or 50
series
40 or 50
series
40 or 50
series
Figure 8: Network connection between basic units, exchange of PLC data