Siemens SINUMERIK 808D ADVANCED Commissioning Manual page 154

Flag registers (M)
Form
● Bit: M0.1, M124.5
● Byte: MB21, MB12
● Word: MW22, MW106
● Double word: MD4, MD28
Counters (C)
Form
Condition of counter: C3 and C25 - represent the comparison result of the counter and preset value
Type
● Plus counter CTU: counter value + 1; R = 1 resets the counter; counter value > preset value; Cn = 1
● Minus counter CTD: counter value - 1; LD counter value = preset value = counter value = 0; Cn = 1
● Plus-minus counter CTUD: counter value + 1 for plus count; for minus count, counter value R = 1 resets the counter;
counter value > preset value; C = 1
Commissioning Manual
154
01/2017