CU : BOOL EnableEnable signal for the drive, Hardware-Enable with 24V signal to X8, Software-Enable command by setup Software, fieldbus or permanently set. Both are required for enabling the drive. counting. Counter is increased on each call when CU is TRUE
CD : BOOL Enable counting. Counter is decreased on each call when CD is TRUE
RESET : BOOL ResetNew start of the microprocessor command. Counter is reset to 0 called with RESET to TRUE
LOAD : BOOL Re-load command. Counter is set to PV when called with LOAD to TRUE
PV : DINT Programmed maximum value
QU : BOOL TRUE when counter is full, i.e. when CV = PV
QD : BOOL TRUE when counter is empty, i.e. when CV = 0
CV : DINT Current value of the counter
The counter is empty (CV = 0) when the application starts. The counter does not include a pulse detection for CU and CD inputs. Use R_TRIG or F_TRIG function blocks for counting pulses of CU or CD input signals. In FFLD language, CU is the input rung. The output rung is the QU output.
CTUr, CTDr, CTUDr function blocks operate exactly as other counters, except that all Boolean inputs (CU, CD, RESET, LOAD) have an implicit rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge detection included.
(* MyCounter is a declared instance of CTUD function block *)
MyCounter (CU, CD, RESET, LOAD, PV);
QU := MyCounter.QU;
QD := MyCounter.QD;
CV := MyCounter.CV;
(* MyCounter is a declared instance of CTUD function block *)
Op1: CAL MyCounter (CU, CD, RESET, LOAD, PV)
FFLD MyCounter.QU
ST QU
FFLD MyCounter.QD
ST QD
FFLD MyCounter.CV
ST CV
See also
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