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Description
PROFIBUS interface
2.5
Bus termination
The PROFIBUS interface of the SSM6000 does not terminate the PROFIBUS at the device end. The SSM6000 does not set the
open-circuit level of the bus at the device end. If this is required, the necessary measures must be implemented in the PROFIBUS
connector. "EasyConn PB" plug connectors from VIPA offer these possibilities. The required auxiliary voltage is made available by
the SSM6000 interface via the plug connector.
2.6
Connector layout
The 9-pole D-SUB socket features the following layout
Pin No.
Signal name
1
Shield
2
M24
3
RxD/TxD-P
4
CNTR-P
5
DGND
6
VP (5V+)
7
P24
8
RxD/TxD-N
9
CNTR-N
3
Data transmission
The PROFIBUS interface of the SSM6000 supports the DPV0 and DPV1 protocol extensions. This means that cyclic and/or acyclic
data exchange is possible.
3.1
Parameter data
Since the SSM6000 DP slave features a modular design, each data module of the SSM6000 must be explicitly parameterized by the
DP master. This means that following the seven parameter data bytes mandatory under the Profibus standards it is also necessary
to write the three DPV1 bytes. The third byte must contain 08
For each module selected, 5 bytes of parameter data are added to the telegram with the following structure:
Structure_Length
Structure_Type
Example of module position1: 05
Example of module position2: 05
Example of module position8: 05
:GA-Profibus_060105-EN-pro.doc
Description
Shield
24V reference potential
Bitbus B line (send data plus)
Repeater control signal
5V reference potential
5V supply voltage
24V supply voltage
Bitbus A line (send data minus)
Repeater control signal
h
Slot_Number
81
00
00
01
h
h
h
h
h
81
00
00
02
h
h
h
h
h
81
00
00
08
and so forth.
h
h
h
h
h
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(bit3 set) as a precondition for transmission of the user-specific data.
reserved
Status
Not used
Not used
Used
Used
Used
Used
Not used
Used
Used
Module_No. (Pos.)
05.01.2006
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