ABB AC500-S Safety User Manual page 227

Configuration and programming
AC500-S Libraries > Safety_Standard.lib
CTU
Counter Up.
CV is incremented by 1 if CU has a rising edge.
Q is TRUE, if CV is reached PV.
CTUD
Counter Up Down
CV is incremented by 1 if CU has a rising edge.
CV is decremented by 1 if CD has a rising edge.
QU is TRUE, if counter is PV.
QD is TRUE, if counter is 0.
CONCAT
Concatenation of two strings.
DELETE
Delete LEN characters of STR, beginning at the POS-th character position.
POS = 1 is the first character.
30.03.2017 AC500-S 227