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MELSEC-A
3 SPECIFICATION
3.4.1 Sampling processing
The A/D conversion is performed successively for the analog input, and the converted
digital output values are stored in the remote register.
The processing time to store the digital output value into the remote register after the
sampling processing differs depending on the number of A/D conversion enabled
channels.
(Processing time) Number of A/D conversion enabled channels) 1 (ms)
Maximum conversion speed
[Example] When three channels, channels 1, 2, and 3 are enabled for conversion:
3×1 = 3 (ms)
3.4.2 Average processing
The AJ65VBTCU-68ADVN/ADIN performs A/D conversion to the channel(s) for the
average processing specified by the PC CPU for the set number of times or for the set
time. The average is then obtained from the total value excluding the maximum and
minimum values, and stored in the remote register. When the number of processing is
two times or less, the sampling processing is performed.
When the A/D conversion enable/prohibit setting is performed, the average processing
is initialized.
(1) When the average processing specification is made for time
• Set the time in 1 ms modules.
• The number of times for processing for the set time depends on the number of
A/D conversion enabled channels.
Set time
(Number of times for processing) =
(Number of A/D conversion enabled channels) × 1 (ms)
Maximum conversion speed
[Example] When the number of A/D conversion enabled channels is two, and the
set time is 1000 ms:
1000/(2 × 1)=500 times
(2) When the average processing specification is made for the number
of times
The processing time to store the average value (average of number of times) into
the remote register depends on the number of A/D conversion enabled channels.
(Processing time) = (Set number of times)
×
(Number of A/D conversion enabled channels)
×
1 (ms)
Maximum conversion speed
[Example] When two channels, channels 1 and 3 are A/D conversion enabled,
and the set number of times is 500:
500 × 2 × 1=1000 (ms)
