4
READBACK
Current position of the valve and status
Controlled variable x in relation to travel range/angle of rotation (OUT_SCALE)
Range of values defined in PV_SCALE
4
SP
The setpoint SP is transmitted to the positioner. Defines the position of the valve between
open and closed.
Range of values defined in PV_SCALE
4
DI_OUT
Output of the DI Function Block
Status of device and measured value
4
Checkback
Refer to section 14.3 for device status.
4
Status
Consistent with the PROFIBUS-PA Profile, a status is assigned to every process value
Status of reference variable (hex):
0-3f
40-7f
80-bf
Bad
Uncertain
Good
Refer to section 14.4 for measured value status.
14.2.1 GSD files
The General Station Description file (GSD file) is included in the scope of delivery for every
PROFIBUS positioner and supplies all information required for the cyclic exchange of process
data (set point, status, etc.) with the host system and for configuring the PROFIBUS network.
Each positioner and its GSD file has a unique ID number (ident number) assigned to it. This
allows the host to check the compatibility between the configuration in the system and the de
-
vice used.
The ID number (ident number) of the GSD file must be the same as the ID number of the de
-
vice to ensure successful integration.
The ID number adaptation feature allows a Type 3785 Positioner to be replaced by a
Type 3730-4 Positioner without having to exchange the GSD file in the host system.
EB 8384-4 EN 87
PROFIBUS-PA communication
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