Statement List (STL) - DCE FEL ČVUT v Praze

4.7 CU Counter Up
Format
CU
Counter Instructions
Address Data type Memory area Description
COUNTER C Counter, range
depends on CPU.
Description
CU increments the count of the addressed counter by 1 when RLO
transitions from "0" to "1" and the count is less than "999". When the count reaches
its upper limit of "999", incrementing stops. Additional transitions of RLO have no
effect and overflow OV bit is not set.
Status word
Example
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - 0 - - 0
STL Explanation
A I 2.1 //If there is a positive edge change at input I 2.1.
CU C3 //Counter C3 is incremented by 1 when RL0 transitions from 0 to 1.
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 4-7