Pilz PNOZ ma1p 2 Analog Input - Manual (Page 16)

4.1 Device properties
4 Function Description
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4-2
4.1.2 Function description
Function description 4-
4.1.2.1 Operation
Operation 4- Funktionen_multi_Analogeingangsmodul
The analogue input module monitors analogue input signals. It can
measure both current and voltage.
The input signals are collected and read in at each input through two
channels and are converted into digital signals. The resolution is 13 Bit
for voltage measurement, 12 Bit for current measurement.
In the PNOZmulti Configurator you can define limit values, which are to
be monitored:
` Range monitoring
With range monitoring you can define the permitted value range. You
can define up to 4 range limits (e.g. < 3 mA monitored for open circuit;
I > 21 mA monitored for input device error). Depending on the select-
ed condition ("greater than" or "less than"), the ENBL output bit and
output bits 1 - 8 for threshold value monitoring are set to "0" if the re-
corded value exceeds or drops below a range limit. An entry is added
to the error stack.
Exception: If "automatic reset" type has been selected, no entry will
be added to the error stack.
` Threshold value monitoring
You can define up to 8 switching thresholds, which can be used to
monitor certain process variables (e.g. different temperature values).
The thresholds can be configured with or without scaling. 2 threshold
values are configured per threshold. One threshold value defines
when the relevant output bit (1 ... 8) is set to "1". The second threshold
value defines when the output bit is reset to "0". No entry is added to
the error stack.
NOTICE
When using the analogue input module for voltage measure-
ment, please note the following:
If the input signal is open circuit or there is a short circuit, this
will not be detected with an input voltage of 0 V. Please use your
risk assessment/hazard analysis to check whether your applica-
tion fulfills the safety-related requirements or whether additional
measures must be taken. We recommend that you configure a
permitted value range between 2 - 10 V PNOZmulti Configurator.