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Haiwell PLC - Temperature & Humidity Module Application Case
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follows:
When the module is used as remote IO, the module and the host PLC are connected via RS485 serial port of A+B-. The default
baud rate of module is 19200, the data format is N 8 2 RTU, the default station number is 1, supporting Modbus protocol.
Disconnected alarm of CR32~33 channels are read back in V32V33. Through WTOB, we know that M300~315 are obtained as
the disconnected alarm status bits corresponding to the 16 sensors in channel 1. M316~331 are the disconnected alarm status
bits corresponding to the 16 sensors in channel 2, so the communication program is as follows:
⑨
What is the role of configuring the number of sensors?
A: If the number of sensors in the H32DT channel is less than the number of configured sensors, then the corresponding indicator
of channel 0 and channel 1 will flash and alarm. When the actual number of sensors is greater than or equal to this configuration
number, no alarm is issued.
⑩
What does numerical value of 850 mean when monitoring?
A: Check the manual of DS18B20 chip, find that the ground wire of the 850th-bit chip is dangling, so check the sensor wiring.
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