140CRP31200 PLC module

The temperature of the input clamp terminal should not be influenced from externally, for example through forced air ventilation or heat sources close to the clamp terminal. External reference junction (CJC ext. – Cold Junction Compensation external) This mode is used when an external isothermal clamp is used. The thermocouples are connected to the isothermal clamp; the voltage signal from the thermocouples is transmitted to the module using copper wires. To calculate the absolute temperature at the measurement junction, the temperature of the external isothermal clamp terminal must be measured. On the module PCDx. W745, input 0 is used to acquire this temperature. All selectable temperature sensors can be used for the measurement of the external reference junction temperature.

Programming with Saia PG5® FBoxes

 For the easy use of the temperature module, an FBox called PCD2.W745 is included in the standard analogue FBox library of Saia PG5®. First of all, this FBox allows configuring the module according to the individual measurement setup. Once the FBox has configured the module, it switches automatically in data acquisition mode. In addition to the reading of the analogue values from the W745, the FBox delivers powerful diagnostic information about sensor failures. For correct working, the FBox should be placed in a cyclic organisation block (COB).FBox name: A name can optionally be given to the FBox. When several FBoxes are used, FBox must have an individual name. in0…in3: Analogue input values (Format / Unit: See chapter 2)● When CJCext is configured, the temperature of the external reference junc tion is measured using channel 0. Therefore, channel 0 can’t be configured for CJCext. ● If a wrong configuration is sent to the module, the NoConfig indicator becomes high and the module does not go in data acquisition mode.

MeasRunning:

 High state indicates that the data acquisition is running. After start-up, this indicator stays low during the first sampling cycle. At the time it goes high, all of the four input channels have an actual value which can be read out. DiagRunning: High state means that the sensor diagnostic is running (Overrange / Underrange / SensorFail) After start-up, the DiagRunning flag stays low during the first sensor fail check cycle. When it switches to high state, all sensors are checked and the channel diagnostics are valid. ComRunning: This flag becomes high when the communication to the module is ok. Installation of the FBs The following 3 files are necessary: ● D2W745_B.src ● D2W745_B.equ ● D2W745_B.mba

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