turck BL20 Series - Page 362

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360
3 Main count direction down
If the counter counts up and reaches the upper count limit, it will jump to the lower count limit
when another counter signal is received. The internal release signal is automatically reset.
f the counter counts down and reaches the lower count limit, it will jump to the load value when
another counter signal is received. The internal release signal is automatically reset.
The internal release signal is automatically reset if the counter passes either the upper or lower limit
values. A rising edge must be present in order for counting to be restarted. This occurs either by
resetting and setting the hardware release signal (digital input if this is configured as HW gate), or
by resetting and setting the software release (SW_GATE bit in the control interface/process output).
The following three diagrams show the counter's behavior in ”single-action count” mode with the
three main count directions: none, up, down.
Upper count limit
‚Load value
ƒLower count limit
„Release stop, internal release
… Release stop, automatic
Fig. 257: Single count without main count direction
a
b
0
c
t
t
t
t
t
STS_OFLW
STS_UFLW
RES_STS
d
e
e
Internal release