HEIDENHAIN PWM 8 - Manual (Page 28)

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Parameter P7: COUNTING DIRECTION [FORWARD, BACKWARD]
P7: FORWARD
= positive counting direction
P7: BACKWARD = negative counting direction
Parameter P8: COUNTER START
[NORMAL, WITH REF]
P8: NORMAL
UNIVERSAL COUNTER starts immediately after selection.
P8: WITH REF
The UNIVERSAL COUNTER starts with the next reference signal. The current count is frozen until the first
reference mark is reached. This "time-out" is marked by the symbol
in the display field of the
UNIVERSAL COUNTER.
Symbol for "timeout":
start with the next reference signal