1.3 Explanation of Memory Areas
1 - 57
1.3.8
Elapsed Value Area for Timer/Counter (EV)
Function of elapsed value areas (EV)
While a timer or counter is operating, the elapsed value is stored in the elapsed value
area (EV) with the same number as the timer or counter.
When the EV reaches zero, the timer or counter contact with the same number turns
on.
An EV is a one
−
word, 16
−
bit memory area which stores a decimal number from K0 to
K32767.
TM n, K
Tn
Value of SVn
SVn
K30
30
0
Value of EVn
EVn
K30
29
28
1
EVn
0
Decrements
Tn turns on when decrement operation ends
Using elapsed value area (EV)
The elapsed value of a timer or counter in operation can be changed to prolong or
shorten the operation.
The value in elapsed value area can be read and changed from the program by
specifying the
F0 (MV)
data transfer instruction.
The elapsed value area can be read and rewritten using a programming tool.
For the FP2/FP2SH/FP10SH, if the Initialize/Test switch is set to the upper side (the
Initialize side) in the PROG mode, the timer/counter elapsed value areas (EV) are
cleared to 0. Even if a hold type has been specified, these values are cleared to 0.
Note
With the FP2SH/FP10SH, system register 4 can be set in such a
way that the timer/counter elapsed value areas are not cleared to
0 even if the Initialize/Test switch is set to the upper side.
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