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 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
®
register map can be used
for the validation process. See section Appendix C,
(page 86), for information about communication
packet structures and host timing.
Figure 31: Connections required to validate communication in a non-hazardous area
Summary of Contents for 266 MODBUS
Page 163: ......