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All input channel signal levels are
constantly monitored. If the signal is outside the specified limits, an alarm
will be generated.
(See also: ChError.)
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Signal too high:
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Alarm bit “SignalHigh” is set if the
input signal exceeds 20 mA by more than 10%. (22 mA) (AnalogIn is held at
22 mA)
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Signal too low:
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Alarm bit “SignalLow” is set if the
input signal falls below 0 mA by more than 5%. (-1 mA) (AnalogIn is held at
–1 mA)
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No load /
Wire broken:
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4-20 mA mode only: A monitor of the
input signal can be enabled to create an alarm “NoLoad” if the current
falls below 3 mA.
This will indicate a no load or wire
broken situation.
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Signal too high:
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Alarm bit “SignalHigh” is set if the
input signal exceeds 200 °C.
(AnalogIn is held at 200 °C)
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Signal too low:
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Alarm bit “SignalLow” is set if the
input signal falls below –100 °C.
(AnalogIn is held at -100 °C)
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Signal too high:
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Alarm bit “SignalHigh” is set if the
input signal exceeds 100 mV by more than 10%, (110 mV) (AnalogIn is held at
110 mV), or exceeds the thermocouple’s specified range:
Type E: +1000 C
Type K: +1372 C
Type N: +1300 C
Type R: +1768 C
Type S: +1768 C
Type T: +400 C
Type J: +1200 C
Type B: +1820 C
(AnalogIn is held at high limit)
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Signal too low:
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Alarm bit “SignalLow” is set if the
input signal falls below 0 mV by more than 5%, (-5 mV) (AnalogIn is held at
110 mV), or falls below the thermocouple’s specified range:
Type E: -94.8 C
Type K: -53.7 C
Type N: -270 C
Type R: -50 C
Type S: -50 C
Type T: -166.5 C
Type J: -109.1 C
Type B: 0 C.
(AnalogIn is held at low limit)
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Notification
Limit
alarms
Transmitter
installation
AnalogIn
calculation principle
Signal
filter
Application
note for PD 640 (mA)
Application
note for PD 641 / 643 (Pt100 / Pt 1000)
Application
note for PD 642 / 643 (mV / thermocouple)
Analogue modules
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