Rockwell-automation 1734-IT2I Thermocouple and RTD Input Module User M Manual do Utilizador descarregar pdf (Página 15)

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)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 83 84

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Rockwell-automation 1734-IT2I Thermocouple and RTD Input Module User M Manual do Utilizador Página 15