Linear Counter And Ring Counter - Panasonic FP7 User Manual

5.1.3 Linear Counter and Ring Counter

The operation changes depending on the types of counter as below.
 Operational difference between the counter types
Comparison
item
Operation
image
Operation when
reaching the
upper limit or
lower limit
Overflow and
underflow
settings
(Note 1): When the upper limit or the lower limit has been changed in the configuration menu, the counter operates
based on its range.
(Note 2): Even when the upper and lower limits have been set on the linear counter, counting continues up to the
range that is countable as a system (-2,147,483,648 to 2,147,483,647) if the overflow and under flow settings
have been set to "Disable".
 Operation in case of overflow or underflow (Linear counter only)
• When "Enable" has been selected in the configuration menu, the error will be announced
once the overflow or underflow annunciation flag turns on.
• The overflow or underflow flag can be cleared by the following operations; Overflow clear
request, Underflow clear request, Reset or Preset operation
• The error clear operation is required to clear error flags.
REFERENCE
•
For details of the error clear method, refer to 10.1 Self-diagnostic Function.
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Linear counter
Lower limit
Count value
Count up
Underflow
Count down
If the count value exceeds the upper limit,
the upper limit will be held.
If the count value falls below the lower limit,
the lower limit will be held.
(Note 1) (Note 2)
It can be announced as an error by the
setting of configuration menu.
If the lower limit or the upper limit has been
set using the configuration menu, an error is
announced based on the set values.
Upper limit
Count up
Overflow
If the count value exceeds the upper limit,
the count value will be the lower limit
automatically and the count operation will
continue.
If the count value falls below the lower limit,
the count value will return to the upper limit
automatically and the count operation will
continue.
(Note 1)
Not settable.
Ring counter
Upper limit Lower limit
Roll
Count down
over
Count value