Asphalt mixing plant control system and data acquisition
Composition of the system
System contains weighing transmitter, programmable logic controllers (PLC) and industrial control machine.
PLC module module (A/D), input/output modules (I/O) weighing sensor input signal display on the transmitter and then receives a/d module, I/O module external limit control relay, and action buttons, PLC and industrial computer connection management features.
Data acquisition
Sensor detection weight changes, will pressure changes into into 0~20 mV simulation volume output to said heavy variable sent display; with displayed of said heavy variable sent device will received of 0~20 mV simulation volume through module conversion (A/D) conversion into digital volume, will will operation results by digital filter Hou sent to LED digital tube displayed weight; while output standard signal of voltage (0~10V) or current signal (4~20 mA) transfer to PLC, PLC will received of standard signal through module conversion (A/ D) converted to digital value is obtained by computing the weight value and through the RS232 serial communication to the IPC.