Siemens DTU3005-B manual Creating Project Files-Modbus Master to Devices

5 Creating Project Files—Modbus Master to Devices

5Creating 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.

5.1Application 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

28 Siemens Energy & Automation, Inc.