MELSEC-A
5. PULSE INPUT AND COUNTING METHOD
5 - 4
5.3 Reading the Present Value
This section gives details on the present value stored in the present value storage
area {addresses RWrn+0 to 1 (addresses RWrn+8 to 9)} and how to read it.
(1) The present value storage area stores the present value at a time when any
counter function is executed.
When each function of latch counter, sampling counter or periodic pulse counter
is executed, the count value will be stored, aside from the present value storage
buffer memory, in the remote registers indicated below.
Description
Latch Count Value/
Sampling Count Value/Periodic
Pulse Count Previous Value
Periodic Pulse Count
Present Value
Remote register
addresses
CH1 RWrn+2 to 3 RWrn+4 to 5
CH2 RWrn+A to B RWrn+C to D
(2) The present value (0 to 16777215) is stored in 24-bit binary in the present value
storage area.
(3) In up counting, the present value storage area returns to 0 when the count value
exceeds 16777215.
In down counting, the present value storage area returns to 16777215 when the
count value exceeds 0.
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