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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.
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
Modbus Master Devices
Siemens 9500 ION 8500 ION 8400 ION 7500
Modbus Slave Devices
Siemens 9200 ION 6200