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I/O modules • 177

Analog Inputs 750-462, /000-XXX

4.4.1.1.4 Input for Thermocouple Modules 750-462, /000-XXX

I/O modules and variations

Technical description

This description is only intended for hardware version X X X X 2 A 0 1 - - - -. The serial number can be found on the right side of the module.

The following description is preliminary and is applicable only to the factory configuration.

The shield is connected to "S". The connection is made automatically when snapped onto the DIN rail.

These I/O modules are not provided with integrated power jumper contacts. The power supply is made by the data contacts with a DC-DC converter.

The thermocouple module can operate with all buscouplers of the WAGO-I/O-SYSTEM (except for the economy type).

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178 • I/O modules

Analog Inputs 750-462, /000-XXX

Attention

The 462/000-XXX modules could be replaced by the 469/000-XXX modules!

The 750-462 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.

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 ‘mV 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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I/O modules • 179

Analog Inputs 750-462, /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 takes into account the temperature offset voltage when calculating the measured value.

You can find the PNs for the different sensor types for 750-462 in the following table.

Operating mode and Temperature range:

Tab 4-1: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 with 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

OFF: voltage is in the measuring range

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I/O modules • 181

Analog Inputs 750-462, /000-XXX

750-462/000-002, Type T

750-462/000-003, measure value ± 120 mV

One Digit correspond to 6.4 V.

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