Communication On 750-333, -833 Via Fdt/Dtm - WAGO 750-484 Manual

68 Description of Operation
frame application "WAGOframe", by means of which FDT tool routing from the
PROFIBUS DP/V coupler/controller to the DTM of the connected HART device
is possible. In this case, HART communication takes place by means of the
acyclic PROFIBUS services, which are processed by a 12-byte mailbox.
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.
10.3.1

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 internal data 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.
WAGO-I/O-SYSTEM 750
750-484 2 AI 4-20 mA HART Ex i
V 1.2.0 HW-Version 04, SW-Version 03
Manual