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5 Service and maintenance
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
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Disable write protection
1.
Disconnect the power supply to 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 the power is live.
This procedure does not require the transmitter to be powered up.
2.
Remove the front housing cover following the instructions in section 5.2.1,
3.
Remove the LCD assembly following the instructions in step 3, section 5.4,
4.
Locate DIP switch 5 on the electronics module (Figure 36). Switches are numbered from left to right, so switch 5 is the next
to the last switch on the right.
5.
Using a small slotted screwdriver, flip switch 5 down to the OFF position. Write protection has been disabled.
6.
Replace the LCD assembly and housing cover (go to sections 5.4,
7.
Restore power to the transmitter.
Summary of Contents for 266 MODBUS
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