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of 148
Timing of the PLC interface
Low overdrive: (e.g. 208 m
Ω
in the 200 m
Ω
range)
roughly 350 µs
Deviations in timing in the event of an error
Different errors are detected at different times and output as quickly as possible. Excessively
large measurement values can only be identified at the end (given a slight transgression of
the measuring range), or when the measuring current is turned on (given an excessively low
driving current for the connected resistor) or during a cable-breakage test.
Start
Stop
roughly 250 - 300 µs
130 - 140 ms
Set new evaluation roughly 1ms
roughly 350 µs
roughly 250 - 300 µs
roughly 250 - 300 µs
End of meas. (R=300 m
Ω
)
roughly 70 - 75 ms
Settings:
Manual 200 m
Ω
, display 20000,
comparator 2 limiting values,
on error >, R, average = 1,
standard conversion,
standard measurement procedure,
single measurement
130 - 140 ms
End of meas. (no error)
Evaluation, e.g. >, = <
Start/Stop meas.
End of meas. (R=208 m
Ω
)
Meas. error (if prev. good)
Meas. error (if prev. bad)- always high
Meas. error (if prev. good)
Important:
A falling edge at 'Start/Stop measurement' stops the single or continuous measurement in progress.
Meas. error (if prev. bad)- always high
Medium overdrive: (e.g. 300 m
Ω
in the 200 m
Ω
range)
