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4 Transmitter start up

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

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

The correct procedure for validating communication is based on the usage application. The 266 MODBUS

multivariable is

designed to be backward compatible with existing 267/269CS installations. In applications where the 266 MODBUS

device is

replacing an existing unit, simply transfer the wiring from the existing unit to the 266 MODBUS

device. Using any of the

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

request to the device and receiving the response. Any of the Read registers listed in the MODBUS

for the validation process. See section Appendix C, MODBUS

packet structures and host timing.

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

ABB 266 MODBUS User Manual

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