COUNT – Controlled counter

Block SymbolLicensing group: STANDARD

Function Description
The COUNT block is designed for bidirectional pulse counting – more precisely, counting rising edges of the UP and DN input signals. When a rising edge occurs at the UP (DN) input, the cnt output is incremented (decremented) by 1. Simultaneous occurrence of rising edges at both inputs is indicated by the error output E set to on. The R1 input resets the counter to 0 and no addition or subtraction is performed unless the R1 input returns to off again. It is also possible to set the output cnt to the value n0 by the SETH input. Again, no addition or subtraction is performed unless the SETH input returns to off again. The R1 input has higher priority than the SETH input. The input $HLD = on$ prevents both incrementing and decrementing. When the counter reaches the value $cnt \geq nmax$ , the Q output is set to on.

Inputs

R1	Block reset ( $R1 = on$ )	Bool
n0	Value to set the counter to (using the SETH input)	Long (I32)
SETH	Set the counter value to n0 ( $SETH = on$ )	Bool
UP	Incrementing input signal	Bool
DN	Decrementing input signal	Bool
HLD	Counter freeze	Bool
	off .. Counter is running on ... Counter is locked
nmax	Counter target value	Long (I32)

Outputs

cnt	Total number of pulses	Long (I32)
SGN	Sign of the cnt output	Bool
	off .. for $cnt < 0$ on ... for $cnt \geq 0$
Q	Target value indicator	Bool
	off .. for $cnt < nmax$ on ... for $cnt \geq nmax$
E	Indicator of simultaneous occurrence of rising edges at both inputs UP and DN	Bool

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