The PC4RTD is a 4 isolated RTD input module. The module uses differential inputs to reduce effects of electrical noise and mains pickup. The RTD inputs are isolated from the logic and from each other. 2, 3 and 4 wire modes are supported.
The RTD is read by the module circuitry, linearised and converted to degrees Centigrade. No ranging is required as the module covers the full range as indicated in the TC table. The value that is read from the module 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. Alternatively the temperature can be read as a floating point value.
The RTD type is setup by writing a value to the Input Type register. Each RTD channel can be individually enabled/disabled and configured with the RTD type.
The RTD module can also be configured to read resistance.
The module plugs into a special bus connector which fits inside the DIN rail. The power supply voltage and the CAN bus signals are connected via this bus connector.
The CAN interface is electrically isolated and is compliant with ISO 11898.
The module has been equipped with status led’s which are used to indicate the status of the Inputs and communications. This visual indication assists with fault finding and diagnostics.
The CANopen node ID and bit rate can be setup by DIP switches or software.
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