Материал: m012900e

I/O modules • 197

Analog Inputs 750-469, /000-XXX

Technical Data:

The function module permits the direct connection of thermocouple sensors.

The module is suitable for 2 or 3-wire thermocouples. For the 2-wire connection, connect the thermocouple wires between TCand TC+ . For the 3- conductor connection, the shield is also connected. The operation of grounded sensors is provided by means of internal electrical isolation.

The module 750-469 detects a broken wire. You can find the PNs for the different sensor types for 750-469 in the following table.

Attention

Both inputs are referenced to a common potential (not isolated)!

The linearization is provided over the complete range by a microprocessor. The temperature ranges of the sensors are represented with a resolution of 1 bit per 0.1°C in one word (16 Bit). Thus, 0°C corresponds to the value 0000, and 25.5°C correspond to the value 0 x 00FF. Temperatures below 0°C are represented in two’s complement.

Within the whole range of all thermocouples, the function module works like a ‘ V meter’. The voltage resolution is represented with 16 bits. A processor converts the voltage value into a numerical value proportional to the measured temperature of the selected type of thermocouple.

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198 • I/O modules

Analog Inputs 750-469, /000-XXX

In order to compensate the offset voltage at the clamping point, a cold junction thermocouple compensation calculation is carried out. The circuit contains a temperature measuring sensor at the ‘CAGE CLAMP ’ connection and considers the temperature offset voltage when calculating the measured value.

Operating mode and Temperature range:

Tabel: Operating mode, Temperature range and Item number of the variations

Attention

The operating mode as mV meter in the range of -120mV to +120mV is only available for hardware version X X X X 3 A 0 2- - - - and above. In older versions, the operating mode as mV meter is in the range of 0mV to 120mV!

LED functions:

green LED: Function ON: Normal

OFF: Watchdog-Timer Overflow

If the PLC does not receive data for 100 ms the green LED turns off.

Red LED: Error

ON: Overor underrange or broken wire

OFF: voltage is in the measuring range

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200 • I/O modules

Analog Inputs 750-469, /000-XXX

750-469/000-002, Broken wire detection ,Type T

750-469/000-003, Measurement range ± 120 mV

One Digit correspond to 6.4 V

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I/O modules • 201

Analog Inputs 750-469, /000-XXX

750-469/000-006, Broken wire detection,Type J

750-469/000-008, Broken wire detection,Type E

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