User manual

16
Publication 1738-SG001B-EN-P
ArmorPoint I/O
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ArmorPoint I/O temperature modules are capable of detecting and communicating the
following electronic conditions:
y over-range alarm
y under-range alarm
y level alarm (low-low, low, high, high-high)
y open-wire alarm
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The channel over-range alarm is set if the input is greater than the maximum temperature
(thermocouple or RTD range dependent), millivolt (+75V) or resistance (600 Ω) range
value, or above the maximum range of the thermocouple or RTD.
The cold-junction compensator has its own over-range alarm. If the CJC temperature goes
above 70 °C, the over-range alarm is set.
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The channel under-range alarm is set if the input is less than the minimum temperature
(thermocouple or RTD range dependent), millivolt (-75 mV) or resistance (10 Ω) range
value, or below the minimum range of the thermocouple or RTD.
The cold-junction compensator has its own under-range alarm. If the CJC temperature
goes below 0 °C, the under-range alarm is set.
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There are four level alarms:
y low
y low-low
y high
y high-high
When the channel input goes below a low alarm or above a high alarm, a bit is set in the
data table. All alarm status bits can be read individually or by reading the channel status
byte (bits 2-5 for channel 0; bits 10-13 for channel 1).
Each channel alarm can be configured individually.
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The module has the ability to check for a broken or detached wire. In any mode, if a
broken/detached lead is detected, the data value is forced to maximum and the over-range
alarm is set. Once the alarm is issued, it remains active as long as the input signal is
faulted.