Counter

BD30_COUNTER

PROGRAM BD30_COUNTER_DEMO
 VAR
 L1: LINT;
 FB1: LIB.CORE.V1_0.BD30_COUNTER;
 FB2: LIB.CORE.V1_0.BD2_PULSE_GENERATOR;
 END_VAR
 
 FB2();
 FB1(BX := FB2.OUT);
 L1 := FB1.OUT;
 
END_PROGRAM

LIB\CORE

V1.0

The block is a pulse counter. Number of pulses is brought to the output OUT. The OUT value may be increased by 1 at rising edge on the BX input, or at falling edge of the BXF input. It may be also decreased by 1 at rising edge on the BXD input, or at falling edge of the BXDF input. The MINIMUM parameter specifies the lower limit of the counting range of OUT, while MAXIMUM is the upper limit. All possible values are thus MINIMUM,MINIMUM+1,MINIMUM+2,…,MAXIMUM-1,MAXIMUM. The behaviour at MINIMUM and MAXIMUM is given by the parameter BRING:

• BRING=TRUE: Ring (cyclic) counter. If OUT=MAXIMUM and the value has to be increased, then it starts at MINIMUM. If OUT=MINIMUM and the value has to be decreased, it is set to MAXIMUM and counts down.
• BRING=FALSE: If OUT=MAXIMUM and the value has to be increased, no operation is done (the value stops at MAXIMUM). If OUT=MINIMUM and the value has to be decreased, the value stops at MINIMUM.

The counter may be reset by a rising edge at the BR input. If BR=TRUE then OUT=MINIMUM and counting is stopped.

The counter counts pulses generated by the BD2 block. Each rising edge increases the counter by 1. The counter is used to count events or to control a cascade heating plant.