ifm
Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
Acyclic services for Profibus DPV1
Services for acyclic data transfer between DPM1 master and slave
315
12.2
Services for acyclic data transfer between DPM1
master and slave
5811
The connection-oriented data transfer is carried out via an MS1 connection. This is established in
DPM1 and is very closely linked to the connection for the cyclic data transfer. It can only be used by
the master which has set and also configured the corresponding slave.
Service
Meaning
READ
the master reads a data block of the slave
WRITE
the slave writes a data block to the master
12.3
Services for acyclic data transfer between DPM2
master and slave
5812
The connection-oriented data transfer is carried out via an MS2 connection. This is established by
DPM2 prior to start of the acyclic data transfer by means of the service
INITIATE
. Then the
connection can be used for the services
READ
and
WRITE
. Termination of the connection is carried out
accordingly. A slave can maintain several active MS2 connections at the same time, only limited by
the resources available in the slave.
Service
Meaning
INITIATE / ABORT
establishment or termination of a connection for acyclic data transfer between DPM2 and the slave
READ
the master reads a data block of the slave
WRITE
the slave writes a data block to the master