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TECHNICAL NOTE

Sub-Metering with a Modbus Master

Sub-metering is typically used for two applications: energy cost allocation or operations information. Sub-metering can be used for billing purposes in any situation where multiple businesses use a common electrical infrastructure. Sub- metering systems can also be used for maintenance planning, and to optimize energy consumption through data collection and analysis. The information discussed in this technical note pertains to a sub-metering application where a Modbus master device collects data from several Modbus slave devices.

Modicon® Modbus is a widely used protocol in process control industries. ION meters can operate in Modbus networks as both slaves and masters, and can communicate easily with ION software or other third-party software. For more information about Modbus, refer to the technical note Modbus and ION Technology.

This document describes the procedure to configure a Modbus master device to control several Modbus slave devices. The following is a list of possible Modbus master and Modbus slave devices.

Modbus Master Devices

Siemens 9500

ION 8500

ION 8400

ION 7500

 

 

 

 

 

Modbus Slave Devices

Siemens 9200

ION 6200

 

 

 

 

 

 

 

The default frameworks included in ION 7600 and Siemens 9600 meters do not support this Modbus Master framework. For more information, contact Technical Services.

In This Document

Configuring the Modbus Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

Connecting the Modbus Slave Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326 Configuring the Modbus Slave Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326 Configuring the Modbus Master Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326 Pasting the Modbus Master Framework into the Meter . . . . . . . . . . . . . . . . . . . 327 Customizing the Modbus Master Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 Multiple Modbus Master Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 Customizing the Modbus Master Front Panel Display . . . . . . . . . . . . . . . . . . . . 329 Controlling the Data Logging Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 Modbus Import Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

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Multi-Tech Systems 7500, 7600 manual Configuring the Modbus Network, Modbus Master Devices, Modbus Slave Devices
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7500, 7600 specifications

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