Functions - Pilz PNOZ ma1p Operating Manual

Function Description
4.2

Functions

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 con-
verted into digital signals. The resolution is 13 Bit for voltage measurement, 12 Bit for cur-
rent 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 encoder er-
ror). Depending on the selected condition ("greater than" or "less than"), the ENBL out-
put bit and output bits 1 - 8 for threshold value monitoring are set to "0" if the recorded
value exceeds or drops below a range limit. An entry is added to the error stack.
Exception: If "automatic start" type has been selected, no entry will be added to the er-
ror stack.
Threshold value monitoring
}
You can define up to 8 switching thresholds, which can be used to monitor certain pro-
cess 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.
The exact analogue values are made available to the base unit to forward to a fieldbus.
This value is transmitted through a single channel and is not safety-related. It can be used
for diagnostic purposes.
Operating Manual PNOZ ma1p
21687-EN-04
NOTICE
When using the analogue input module for voltage measurement, please
note the following:
If the input signal is open circuit or there is a short circuit, this will not be de-
tected with an input voltage of 0 V. Please use your risk assessment/hazard
analysis to check whether your application fulfills the safety-related require-
ments or whether additional measures must be taken. We recommend that
you configure a permitted value range between 2 - 10 V PNOZmulti Config-
urator.
INFORMATION
The online help on the PNOZmulti Configurator contains descriptions of the
operating modes and all the functions of the control system PNOZmulti.
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