Description Of Functions - ABB RLM01 Inbetriebnahmeanweisungen

2 Description of functions

3BDD011600R05
The three RS 485 interfaces of the module support all transmission rates specified
in DIN 19245 for the PROFIBUS from 9.6 kBit/s to 12 MBit/s. The module has
repeater functionality, i.e., it regenerates the signal shape and the amplitude of
received data. RLM 01 monitors all three lines A, B and M for activity and error
states. Detected errors are signalled by lit diodes on the front panel. The potential-
free alarm contact activated in parallel to this can be polled for diagnostic purposes
by the process control system PCS or by a programmable logic control PLC. The
three serial RS 485 interfaces are potential-free relative to each other and to the
power supply. This is a functional electrical isolation.
Fig.: Hardware block diagram of RLM 01
Description of functions
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