Commissioning The Transmitter; Figure 31: Connections Required To Validate Communication In A Non-Hazardous Area - ABB 266 MODBUS User Manual

4 Transmitter start up

Commissioning the transmitter

Once the transmitter has been installed, powered, and configured, commission the transmitter into operation.
The following are requirements to commission the transmitter.
— Validate communication
— Leak-test the connections
— Validate the transmitter measurement
— Put the transmitter in service
Validating communication
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The correct procedure for validating communication is based on the usage application. The 266 MODBUS multivariable is
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designed to be backward compatible with existing 267/269CS installations. In applications where the 266 MODBUS device is
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replacing an existing unit, simply transfer the wiring from the existing unit to the 266 MODBUS device. Using any of the
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methods listed in section 4.3.1.1, Set MODBUS device address, set the MODBUS address to the same address as the device
being replaced and communication should immediately be available. No further action is required.
In new installations, setup and validation can still be a simple task if the communication and supply voltage wiring meets the
requirements of the device (Figure 31). Once the wiring has been established, communication validation is simply sending a
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request to the device and receiving the response. Any of the Read registers listed in the MODBUS register map can be used
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for the validation process. See section Appendix C, MODBUS register lists (page 86), for information about communication
packet structures and host timing.

Figure 31: Connections required to validate communication in a non-hazardous area

266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 37