Replacing The Electronics Module; Figure 38: Software Revision Numbers - ABB 266 MODBUS User Manual

Replacing the electronics module

The following procedure provides steps to replace the electronics module in the transmitter.
WARNING – Bodily injury. When the housing covers are removed and power is still connected, there is a
potential for explosion. Failure to observe this safety information may result in death or severe injury.
Do not remove housing covers in hazardous (classified) areas or explosive environments unless the area is
known to be non-hazardous. Verify an explosive atmosphere is not present before removing the housing covers
when power is live.
Initially, this procedure does not require the transmitter to remain powered up. However, the power must be
applied to upload the device configuration, then powered down again, and powered up to finish the procedure.
1. Determine the device software version:
a. Press the right soft key to access the HMI menu.
b. Use the key pad to locate and select Device Info > Revisions > Software Revision.
c. View the software revision (Figure 38). The first seven (7) digits before the slash mark represent the electronic
module software revision and the six (6) digits following the slash mark represent the measurement assembly
software revision.
d. Record the electronic module software revision. This revision will determine which procedure to follow after replacing
the electronic module.
2. Disconnect the power supply to the transmitter.
3. Use the instructions in section 5.2.1, Removing the housing cover, to remove the front housing cover, exposing the interior.
4. Use a slotted screwdriver to press the tabs on the LCD fixing locks to release the assembly then remove it (Figure 37,
page 48).
5. Remove the electronics module by removing the 2 fastening screws (Figure 39).
50 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB

Figure 38: Software revision numbers

5 Service and maintenance