Samson 3730-4 - Page 88

The host performs a compatibility test by checking the configured GSD file/ID number before
starting cyclic data exchange. If the positioner is in the compatibility (adaptation) mode, the
positioner also accepts the GSD files/ID numbers of the Type 3785 Positioner (Profile 2.0
and 3.0) and goes into cyclic data exchange.
For communication with the automation system, just the features of the active positioner (ac-
tive ID number) are supported.
Example: If the Type 3730-4 Positioner is operated in the compatibility (adaptation) mode
for Type 3785 Profile 3.0, the diagnosis telegram then communicates as with Type 3785. Di
-
agnosis bits, which were first introduced with Profile 3.01, are not set. Additionally, the DI
Blocks of Type 3730-4 cannot be used as they are not available in Type 3785.
When replacing the Type 3785 Positioner with the Type 3730-4 Positioner, the following
steps must be taken:
NOTICE
–
The Type 3730-4 Positioner must be mounted and connected properly (see sections 2 and
3.)
–
Configuration over PROFIBUS must be performed with the associated EDD or DTM of
Type 3730-4 as this is the only way to access the device parameters.
88 EB 8384-4 EN
PROFIBUS-PA communication
Fig. 28 · Exchanging positioners with automatic ID number adaptation
HOST
Host system,
e.g. BPCS, PLC etc.
Type 3785 Profile 3.0
ID number 0688
Type 3730-4
ID number 071D
GSD
0688
Exchanging positioners
Compatibility mode active
Works as Type 3785 Profile 3.0
with ID number 0688
Compatibility test
Expects Type 3785 Profile 3.0
with ID number 0688