Communication With Modbus Slaves; Configuration Options With The Dnp3 Tims; Configurations With S7-300 - Siemens SIMATIC TIM 3V-IE DNP3 System Manual

Network structures and configurations

2.3 Communication with MODBUS slaves

● A node station with DNP3 TIMs can communicate with a higher-level DNP3 master
station and with DNP3 stations of a lower-level DNP3 network.
This means that DNP3 communication via several lower-level hierarchical networks is not
possible.
● Communication between station and station is also not supported.
Details on the attachment options can be found in the section Technical specifications
(Page 299).
The initiative for communication generally comes from the DNP3 master station that sends
commands to and polls the lower-level devices. The DNP3 station reacts with a
corresponding response.
Stations can also send spontaneous (unsolicited) messages relating to events to the master
station.
Communication relations that are not supported
● Communication between master station and master station is not supported.
2.3 Communication with MODBUS slaves
Connecting MODBUS slaves
Devices that communicate using the MODBUS RTU protocol can be connected as MODBUS
slaves to a SIMATIC S7 station with a DNP3 TIM. The S7 station operates as MODBUS
master. The communication is handled in the S7 station via the serial interface of a DNP3
TIM.
In the DNP3 network, the S7 station to which the MODBUS slave or slaves are connected
operates as a DNP3 station.
2.4

Configuration options with the DNP3 TIMs

2.4.1

Configurations with S7-300

Possible configurations
The following configuration options are possible with DNP3 TIMs in the S7-300. You will find
the numbering of the station connectors in the following figure.
1. Single connection of a station via 1 Ethernet network
2. Single connection of a station via 1 classic WAN network, alternatively:
– DNP3 dedicated line network
– DNP3 dial-up network
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System Manual, 12/2015, C79000-G8976-C253-04
TIM DNP3