ABB AC 800M

Section 1 Introduction PROFIBUS Technology Terms
3BDS009029R5001 B 21
A 7-bit device address serves to identify the bus participants in the network. The
addresses range from 0 to 127, and the following are reserved:
• Address 126: default for automatic address assignment via the master;
• Address 127: sending broadcast telegrams.
If the address 0 is used for the class-1 master, the addresses 1 to 125 are available for
addressing the field devices. Therefore up to 126 DP or PA field devices (master and
slaves) can be addressed. Each address can only be used once in a single
PROFIBUS network.
Communication Protocols
At the protocol level, PROFIBUS offers a broad spectrum of options, which enables
optimum communication between different applications. PROFIBUS DP is a fast
and deterministic process data exchange between a PROFIBUS master and the
assigned slave devices.
Presently the basic and extended functions supported with AC 800M/CI854(A) are:
• Basic function (V0):
– Cyclic data transfer
– Diagnostic
– Configuration via GSD files
• Extended function V1:
– Acyclic data transfer
– Alarm handling (planned, but not supported yet)
– FDT/DTM device management
– Function blocks acc. IEC 61131-3