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6 RTD INPUTS
The MM6RTD module is a 6 RTD input module. The module can accommodate either 2 or 3 wire RTD sensors. The RTD inputs are isolated from the logic. The RTD resistance is read by the module circuitry, linearised and converted to degrees Centigrade. No ranging is required as the module covers the full range of the RTD as indicated below. The value that is read from the Modbus register is the actual temperature in degrees centigrade to 0.1°C resolution. ie: a value of 3451 corresponds to a temperature of 345.1°C. The RTD type is setup by writing a value to the RTD Type register . The value is obtained from the table below. For example to select a PT100 RTD, the value "1" must be written to the RTD Type register. All 6 RTD inputs adopt the same RTD type. The DIP switch 9 is used to select upscale or downscale burnout for break detection. A value of 32768 is used to indicate upscale burnout and a value of -32767 is used to indicate downscale burnout.
Note: As there is no inter-channel isolation, isolated RTD's must be used in order to prevent ground loops and reading errors.
Power Supply: Logic 10 - 26Vdc @ 80 mA Inputs: 2 or 3 Wire RTD Type Range Accuracy Standard 1 - PT100 -200 to 850 °C 0.3°C IEC 751:1983 2 - Ni120 -80 to 320 °C 0.3°C Resolution 0.1°C Drift 100ppm/°C Typ. Line resistance effect < 0.1°C balanced Max. line resistance 100ohms Isolation 1000Vrms between field and logic Connector: 11 Pin Connector on rear of unit 18 Way screw connector on front
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