Siemens DTU3005-B Manual del operador descargar pdf (Pagina 7)

1 Introduction

Siemens Energy & Automation, Inc. 3

1.4.2 Modbus Master to SEAbus

The DTU3005 unit can be configured as a Modbus

(RTU) slave. In this configuration, a Modbus master

device (usually a SCADA system) is connected to port

1. The Modbus master uses the DTU3005 to monitor

and/or control Siemens ACCESS devices. A typical

Modbus application is shown below in Figure 1.5. The

passthrough port (port 3) can be used to connect to a

supervisory computer running WinPM software. It can

also be used to connect to a second, independent

Modbus Master device. This is shown in Figure 1.6.

Up to 32 DTU3005B units can be daisy chained using a

cable connected to port 1 of the three units. Each

DTU3005B device should have a different Modbus

device number. A daisy chained configuration is

shown in Figure 1.7.

Figure 1.5 Modbus Master to SEAbus

Figure 1.6 Two Independent Modbus Master Devices

to SEAbus

1 2 3

DTU3005B

Up to 32

ACCESS Devices

Acting as a Modbus

(RTU) slave. Data

is requested by

supervisory software.

Supervisory Software

on Modbus Master

RS-485

1 2 3

DTU3005B

Up to 32

ACCESS Devices

Acting as a Modbus

(RTU) slave. Data

is requested by

supervisory software.

Acting as a Modbus

(RTU) slave. Data

is requested by

supervisory software.

Supervisory Software

on Modbus Master

Independent Modbus Networks

Supervisory Software

on Modbus Master

RS-485

1 2 3 4 5 6 7 8 9 10 11 12 ... 140 141

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Siemens DTU3005-B Manual del operador Pagina 7

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