Mitsubishi Electric FX2N-8AD, User Manual

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FX2N-8AD Analog input block Buffer Memory (BFM) 8
8-27
8.2.15 BFM#33 disconnection detection (Only goods: since V1.10).
It does the disconnection detection of all channels used by writing K1 in BFM#33 in the
thermo-couple input mode (Set it by BFM#1 and # 0).
It executes the disconnection detection only once, and the result is written in BFM#28.
(It turns on the odd number bit of the channel where the disconnection occurs. Refer to Table
8.5.)
When it completes the execution of the disconnection detection, K0 is automatically written in
BFM#33.
Write K1 in BFM#33 regularly when you continuously execute the disconnection detection.
At this time, you should use the internal clock so that the interruption of the analog to digital
conversion may increase when it does every operation execution.
It tur ns off POWER LED during the disconnection detection execution. (Blink when
continuously executing it)
Program example
In the program of the following, when it detects
the disconnection with each channel, it turns on
the undermentioned supplementary Relay.
CH1:M101 CH5:M109
CH2:M103 CH6:M111
CH3:M105 CH7:M113
CH4:M107 CH8:M115
M8013
TO
P
K0 K33 K1 K1
M8000
FROM K0 K28 K4M100 K1
1s clock
RUN monitor