NORD Drivesystems BU0550 - Manual (Page 45)

3 AWL (Instruction List, IL)
BU 0550 GB-0813 45
3.5.1.3 CTUD upward and downward counter
With a rising flank on CU the counter of the counter CV is increased by 1, as long as CV is less than 32767.
With a rising flank on CD the counter CV is reduced by 1, as long as CV is greater than -32768. Via R the
counter CV can be reset to 0. Via LD the value saved in PV is copied to CV.
LD and R have priority over CU and CV. PV can be changed at any time; QU always refers to the value
which is currently set.
CU
R
CD
LD
CV
QU
QD
PV
Table 61 CTUD upward and downward counter
3.5.1.4 SR Flip Flop
Bi-stable function: the output Q1 is set via S1 and deleted via R. S1 is dominant if TRUE is set on R and S1
simultaneously.
Table 62 SR Flip Flop
VAR_INPUT VAR_OUTPUT
Input Explanation Type Output Explanation Type
CU Counting upwards BOOL QU TRUE, if CV >= PV BOOL
CD Counting downwards BOOL QD TRUE, if CV <= 0 BOOL
R Reset: counter reading BOOL CV Actual counter reading INT
LD Load starting value BOOL
PV Starting value INT
VAR_INPUT VAR_OUTPUT
Input Explanation Type Output Explanation Type
S1 Set BOOL Q1 Output BOOL
R Reset BOOL