
Publication 1734-UM004F-EN-E - December 2012
About POINT I/O Modules 5
Use Module Alarms
POINT I/O modules are capable of generating the following alarms.
•Overrange
•Underrange
• Level (low-low, low, high, high-high)
• Cold-junction Compensation (CJC) Fault (1734-IT2 only)
•Open-wire Detection
Overrange Alarm (1734-IT2I, 1734-IR2, and 1734-IR2E modules)
The channel overrange alarm is set if the input is greater than the maximum
temperature (thermocouple or RTD range dependent), millivolt (+75 mV) or
resistance (600 Ω) range value, or above the maximum range of the
thermocouple or RTD.
The cold junction compensator has its own overrange alarm. If the CJC
temperature goes above 70 ⋅ C, the overrange alarm is set.
Underrange Alarm (1734-IT2I, 1734-IR2, and 1734-IR2E modules)
The channel underrange 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 underrange alarm. If the CJC
temperature goes below 0 ⋅ C, the underrange alarm is set.
Level Alarms (1734-IT2I, 1734-IR2, and 1734-IR2E modules)
The following level alarms are available.
•Low
1734-IR2E RTD Input Module
RTD Type Low Scaling
Endpoint
High Scaling
Endpoint
O hms 100 Ω 200 Ω
100 Ω Ptα = 0.00385 Euro 32 °F (0 °C) 572 °F (300 °C)
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