Lenze I/O system 1000 System Manual - Manual (Page 312)

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Parameterising the counter
One counter 32 bits, 24 V DC − EPM−S600
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312 EDSIO1000 EN 7.0
Additional functions Description
Main counting
direction The main counting direction can be parameterised:
None: The whole counting range is available.
Forwards: Limitation of the counting range upwards. The counter counts from the
parameterised loading value in the positive direction to the parameterised final value −1
and then skips to the loading value again with the encoder pulse that is following.
Backwards: Limitation of the counting range downwards. The counter counts from the
parameterised loading value in the negative direction to the parameterised final value +1
and then skips to the loading value again with the encoder pulse that is following.
Gate function The gate function serves to start, stop, and interrupt a counting function. In the case of
this counter a differentiation between the internal gate (I−gate), hardware gate (HW
gate), and software gate (SW gate) is made.
l The I−gate is the AND logic operation of the software gate (SW gate) and the hardware
gate (HW gate).
l The SW gate is controlled via your user program (status word in the output area).
l The HW gate is controlled via the digital gate input.
The following response can be parameterised:
Cancelling gate function:After closing the gate and opening it again, the counting process
continues from the loading value again.
Interrupting gate function:After closing the gate and opening it again, the counting
process continues with the last current counter content.
Latch function If a positive edge occurs at the latch input, the current count value is stored in the latch
register. The latch register is accessed via the input area. After a STOP−RUN transition,
latch is always 0.
Comparator You can specify a comparison value which, depending on the count value, activates the
digital output or triggers a process alarm.
Hysteresis By specification of a hysteresis you can for instance prevent the output from being
permanently switched if the value of an encoder signal fluctuates around the comparison
value.
Process alarm The activation of a process alarm can be parameterised. A process alarm can be triggered
in the case of the following events:
l Hardware gate open
l Hardware gate closed
l Counting limit − overflow
l Counting limit − underflow
l Comparison value reached
l Final value reached
l Latch value reached
Diagnostic alarm If the diagnostic alarm is enabled in the parameter setting, it occurs if another process
alarm is triggered for the same event during a process alarm processing
.
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Further information can be found in the chapter "Product description".