Siemens sitrans LU01 - Manual (Page 87)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 81
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P902 Watchdog
Press ENTER to put the CPU into an infinite loop to test the watchdog timer.
On successful completion (10 seconds) the RUN mode is entered and the SITRANS LU01
is reset. Programming is kept and the unit responds as if there had been a power failure.
P903 Display
Press ENTER to activate the display test.
All LCD segments and symbols are temporarily displayed.
P904 Keypad
Press ENTER , then press each keypad key in the following sequence:
As each key is pressed, the associated keypad number is displayed. On successful test
completion, PASS is displayed. FAIL is displayed if a key is pressed out of sequence or the
programmer keypad malfunctions.
P905 Transmit Pulse
Used to monitor the transmit pulse with an oscilloscope connected to the transducer
terminals.
Press ENTER to supply repeated transmit pulses, at the frequency entered, to the
transducer and / or view the transducer operating frequency (automatically altered by
P004 Transducer) for the Point Number displayed.
P906 Communications
Press ENTER to test the SITRANS LU01 communications circuitry.
On successful completion, PASS is displayed. Otherwise FAIL is displayed. If FAIL is
displayed, repeate the test (the first test performed sets up the auto polarity function).
Values Range: 10 to 60 kHz
Altered By • P004 Transducer
Note: Before activating this feature, connect terminal block contacts 27 to 29
and 28 to 30.
P P
1 2 3 4
mA
5 6 7 8 9 0