ABB SM811 Standard 2-wire PTC Sensor

ABB SM811 Standard 2-wire PTC Sensor

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Upon receiving initialization from the controlling module (MFP/MFC), the FEC module stores that information in memory and checks the configuration of each input channel. If all input channels check good, operation begins. If the FEC module detects a configuration error, that error appears in the module status report. Under normal operation, the controlling module sends transmitter commands and requests process input data and status information from the FEC module.

The FEC module continuously reads each input channel, does the necessary conversions and stores the data in memory. When the controlling module makes a request for data, the FEC module sends it the most current information that it has in memory. 

If a communication failure with one of the transmitters occurs, the FEC module works to restore communication while continuing normal operation. It checks the transmitter configuration upon restoring transmitter communication and normal process control continues.

ABB SM811 Technical drawing:

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