Communication On 750-333, -833 Via Fdt/Dtm; Figure 26: Example Of A Fdt/Dtm Communication Via Profibus - WAGO I/O-SYSTEM 750 Manual

74 Commissioning
Consider maximum number of modules!
Because of the process data capacity of the HART I/O module, please be sure to
take into account the corresponding maximum number of modules that can be
connected when using a WAGO PROFIBUS DP/V1 Coupler (750-333) or
Controller (750-833). You can find this number in the list of the table
"Compatibility List".
Additional Information about "WAGOframe" and
"Profibus/HARTGatewayDTM"
The FDT/DTM frame application "WAGOframe" can be ordered under Item No.:
759-370; the free "Profibus/HARTGatewayDTM 759-360" can be downloaded
from the WAGO website at:
www.wago.com → Support → Additional documentation and information on
automation products.
9.3.1

Communication on 750-333, -833 via FDT/DTM

The Profibus/HARTGatewayDTM 759-360 and the DTM for the connected HART
sensor are embedded in the WAGOframe FDT/DTM frame application.
Communication from the WAGOframe FDT/DTM frame application to the
connected HART sensor takes place in three phases:
1 The DTM of the HART field device first creates a HART telegram. This is
received by the WAGO Profibus/HARTGatewayDTM and packed into a
Profibus telegram. This is then sent to the 750-333 or 750-833 by means of
the Profibus communications DTM.
2 The Fieldbus Coupler (750-333) or Controller (750-833) acts as a gateway.
The fieldbus coupler/controller receives the Profibus DP/V telegram and
transfers it via the mailbox, which is incorporated into the process image of
the fieldbus coupler/controller. This mailbox data is then used to forward
the commands to the HART I/O module by means of the local bus (KBUS).
3 The final transfer of data between the HART I/O module and the connected
sensor then takes place using the HART-on-Profibus protocol.

Figure 26: Example of a FDT/DTM Communication via PROFIBUS

Manual
Version 1.4.0
WAGO-I/O-SYSTEM 750
750-484 2AI 4-20mA HART Ex i