Output Signal; Write Protection - ABB 265DS Operating Instruction

Commissioning
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6.1

Output signal

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If the pressure applied falls within the values indicated on the name plate, the output current will
be between 4 and 20 mA.
If the pressure applied falls outside the set range, the output current will be between 3.5 mA and
4 mA if the range is undershot or between 20 mA and 22.5 mA if the range is overshot
(depending on the respective configuration).
Standard setting for normal operation
3.8 mA / 20.5 mA
In order to prevent errors in flowrate measurements (265Dx) in the lower range, it is possible to
set a "zero reset function" and/or a "lin./sq. root transition point" by means of the graphical user
interface (DTM). Unless otherwise specified, the "lin./sq. root transition point" is set to 5 % and
the "zero reset" to 6 % of the flowrate end value by the manufacturer; in other words, the 265Dx
transmitter only operates with the "zero reset function".
A current that is < 4 mA or > 20 mA may also indicate that the microprocessor has detected an
internal error.
Standard setting for error detection
21 mA
The graphical user interface (DTM) can be used to diagnose the error.
Important
A brief interruption in the power supply results in initialization of the electronics (program
restarts).
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6.2

Write protection

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Write protection prevents the configuration data from being overwritten by unauthorized users. If
write protection is enabled, the "0 %" and "100 %" buttons are disabled.
However, it is still possible to read out the configuration data using the graphical user interface
(DTM) or another, similar communication tool.
The control unit may be leaded if required.
Write protection is activated as follows (also refer to the symbols on the plate):
1. First, use a suitable screwdriver to press the switch down fully.
2. Then turn the switch clockwise by 90°.
Important
To deactivate the switch, push it down slightly and then turn counterclockwise by 90°.
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38 265Dx, 265VS IM/265D/V-EN-02