Communication Failure; Table 17: Communication Parameters - ABB 266 MODBUS User Manual

Communication failure

There are two approaches for troubleshooting communication. First, verify that the communication parameters in the transmitter
have been properly set. Second, verify that the RS-485 MODBUS
wired and properly terminated. Use the following procedures to troubleshoot a communication failure.
Verifying communication parameters
Communication setup parameters must match the settings in the Host device for proper communication.
1. Press the right soft key to access the HMI Main Menu.
2. Use the key pad to locate and select Communication.
3. Scroll through the communication menu and verify that all the parameters for this transmitter match those set in the Host
device (Table 17).
Main Menu
Communication
a. If the parameters do not match those set in the Host device, make adjustments.
b. If an adjustment was made to the parameters and the communication has been restored, it is not necessary to
continue this procedure.
c. Exit the menu when finished.
4. If there are multiple transmitters on the bus, verify that all parameters for each transmitter match those set in the Host
device.
a. If the parameters do not match those set in the Host device, make adjustments.
b. If an adjustment was made to the parameters and the communication has been restored, it is not necessary to
continue this procedure.
5. If communication has not been restored, proceed to section 6.3.2, RS-485 wiring connections.
76 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
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communication connection (Bus + and Bus -) is correctly

Table 17: Communication parameters

Submenu 1 Selections
TAG (enter name)
Address Modbus address 1-247
Baud rate
Response Delay (in ms)
None
Parity Even
Odd
ABB 266\x2F267 Map
Modbus Map Select Rosemount 3095FB Map
Invensys IMV25 Map
Zero Based
Modbus Reg. Offset
One Based
1200 2400
9600 19200
6 Troubleshooting
4800
38400