Linear Counter Function - Mitsubishi MELSEC-Q Series User Manual

12
COUNTER FUNCTION
12.2

Linear Counter Function

(1) Linear counter operation
(2) Overflow
When the linear counter is selected, counting is operated in a range between -
1073741824 (lower limit value) and 1073741823 (upper limit value).
Present counter value
0
Subtraction
Overflow
(a) When the linear counter is selected for the counter format, if the present value
falls below -1073741824 (lower limit value) in subtraction or exceeds 1073741823
(upper limit value) in addition, an "Overflow" warning (warning code: 27) occurs.
(b) If an overflow occurs, 1 is stored in the overflow detection flag (
of the buffer memory, and counting is stopped. Even if a pulse is input in that
condition, " Count value" does not change from -1073741824 or
Md.3
1073741823.
(c) An overflow can be cancelled by presetting the "
in the range between -1073741824 and 1073741823.
Executing preset stores 0 in the overflow detection flag (
buffer memory, allowing restart of counting.
Note that the values stored in the "
status of the Axis/CH warning occurrence signal (X4 to X6) are not reset until the
error is reset. Reset the error by turning ON the Axis/CH error reset signal (Y1 to
Y3) after counting is restarted by the preset function.
Overflow
1073741823
Addition
1073741824
Md.3
Axis/CH Warning code" and the ON
Md.6
12.2 Linear Counter Function
Status: b3)
Md.7
Count value" to the value
Status: b3) of the
Md.7
12
- 3
9
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