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Process
Token-passing
process
Master-slave
process
Table 12.1:
The two processes can also be mixed in order to create a multi-master system. The MA
functions both in a mono-master system as well as in a multi-master system.
Notice!
In 2007, the PROFIBUS DP was extended by the DPV2 specification. The specification will
then also permit slave-slave communication. The MA
communication.
12.5.3 Device types
With the PROFIBUS DP, there are two types of master and one type of slave:
Device type
Class 1 master
(DPM1)
Class 2 Master
(DPM2)
Slave
Table 12.2:
Note!
The device is defined as a slave in the device master file (GSD file) of the MA 204i!
All expanded services are not implemented for the MA
Leuze electronic
Description
With this process, the bus-access permission is distributed by means of
a token. The participant obtains permission to transmit with the token. The
token wanders between the master devices in the ring in a permanently
defined time frame. This type of bus access is used for communication
between the masters.
Various slave devices are assigned to a master. The master can address
the slaves which are assigned to it and fetch messages from them. The
master always has the initiative.
PROFIBUS bus-access processes
Description
Class 1 masters are defined for the user-data communication
(e.g. PLC, PC).
Class 2 masters are defined for commissioning purposes. Additional
services facilitate easier configuration as well as device diagnosis.
The slave is a peripheral device which makes available input data for
the control and receives output data from the control.
PROFIBUS DP master and slave types
MA
Commissioning and configuration
204i
does not support this type of
204i
204i
MA 204
No
Yes
MA 204
X
PROFIBUS profile.
204i
65
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