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5 Creating Project Files—Modbus Master to Devices

28 Siemens Energy & Automation, Inc.

5 Creating Project Files—Modbus

Master to Devices

This chapter covers configuration of the DTU3005 for

Modbus master device communications with Siemens

devices. Once you have created a Modbus Master to

Devices project (see Chapter 3), follow the directions

in this chapter to configure the project file. Then see

Chapter 7 for directions on downloading the project to

the DTU3005.

5.1 Application Description

The Modbus Master to Devices application allows a

Modbus master (usually a SCADA system) to control

and monitor up to 32 SEAbus devices or Siemens pro-

tective relays. In this application, the DTU3005B acts

as a slave, and all communications with the Modbus

Master are initiated by the master device itself. The

DTU3005B converts Modbus requests received into

requests to access and control data on the Siemens

devices. Registers are assigned for each device in the

Holding Register range (40000 to 49999, where regis-

ter 40001 is the first to be used). The Modbus Master

accesses real-time data from the Siemens devices by

reading these registers, and sends commands by writ-

ing to these registers. Refer to Figure 5.1 for a matrix

representation of these registers.

Figure 5.1 Modbus Master to Devices Project—Data Registers Matrix

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 140 141

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Siemens DTU3005-B Betreibershandbuch Seite 32