Материал: m013205e

Technical Data:

The function module 750-462 permits the direct connection of thermocouple sensors. The module is suitable for 2 or 3-wire thermocouples. For the 2-wire connection technique, connect the thermocouple wires between TCand TC+ . For the 3-conductor technique the shield is also connected. The operation of grounded sensors is provided by means of internal electrical isolation.

The function module 750-469 alos detects a broken wire. You can find the PNs for the different sensor types for 750-462 in the following table.

Warning: 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 with a leading ‘1’.

Within the whole range of all thermocouples, the function module works like a ‘μV 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.

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.

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Temperature Ranges of the connectable sensors:

Table 1: Temperature ranges of the connectable sensors

Attention: The range of the mV Meter is 0 to 120mV at the moment!

LED functions:

green LED: Function ON: Normal

OFF: Watchdog-Timer Overflow

If the PLC does not transmit processing data for 100 ms the green LED stops lightning.

red LED: Error

ON: Overor underrange or broken wire (bei 750-469) OFF: voltage is in the measuring range

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The numerical formats

All temperature values are represented in a uniform numerical format. In the default setting (type K) one Bit corresponds to 0.1°C. The output value corresponds to the temperature range of each sensor as defined according to standards. By using a configuration tool, the output formats can be chosen. The linearization can be switched off and the building of the reference temperature can be switched off also. The following table identifies the numerical format on the default range (type K).

Table 2: Numerical formats

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2 Channel Analog Input 0-20 mA / 4- 20 mA single ended

PN 750-465, 750-466, 750-486, 750-465/000-001

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 input channels are single ended and they have a common ground potential.

The inputs are connected to +I. Via 24 V / 0 V a sensor can be provided directly from the module. Power connections are made automatically from module to module when snapped onto the DIN rail.

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

Attention:

The lowest power jumper contact is not carried out for some modules (e.g. 4-channel)! A module which needs all contacts (e.g. 2 channel digital) may not be connected to the right hand side of modules which do not have 3 power jumper contacts (e.g. 4 channel modules).

The input module can be connected to all buscouplers of the :$*2Ç, 2Ç6<67(0 (except for the economy type)

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