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118
SR2MAN01 11/2007
Fast Counter
Description The Fast Counter function is used to count pulses up to a frequency of 1 kHz.
Use of the K1 contact indicates:
z The preset value has been reached (upcounting),
z The value 0 has been reached (downcounting).
The Fast counter inputs are implicitly connected to the I1 and I2 smart relay inputs:
z A pulse (rising edge) on the I1 input increments the counter,
z A pulse (rising edge) on the I2 input decrements the counter.
These inputs should not be used on the wiring sheet.
The
Fast Counter
function can be reset to zero during use by the
RK1
coil. It is reset to:
z 0 if it is in up-count mode towards the preset value
z the preset value if it is in down-count mode from the preset value.
The counter only operates if the TK1 confirmation coil is active.
Repetitive mode can be used with a time-delay value.
Note: Limit overrun:
z
If the current value of the counter exceeds the upper limit:
+ 32,767
, it is set to
- 32,768
,
z
if the current value of the counter exceeds the lower limit:
-32,767
, it is set to
+32,768
.
Note: This function block cannot be simulated.