The program logic for the PLC for the ABL SBR© was developed by ABL. The PLC program automatically adjusts the number of cycles based on the flow rate through the plant. The number of cycles is variable (typically ranging from 4 to 8 cycles per day per SBR Tank), and as the number of cycles increases, the duration of the react stage decreases.
The program is written in standard ladder logic and controls the plant equipment (actuated valves, blowers and pumps) based on input signals from field instruments such as float switches, tank levels, current draws, alarms, hour meters readings, pump and blower running status, and actuated valve status. Key process controls are adjustable by the plant operator through the PLC interface to allow changes to process and alarm setpoint values.
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