Data Acquisition Timing - Panasonic FP7 Series User Manual

4.4 Data Acquisition Timing

4.4 Data Acquisition Timing

■
Input conversion processing time of the unit
Conversion processing time varies with the range and the number of channels in use. The
conversion execution/non-execution channel function can save the conversion time for
channels that do no execute conversion processing.
Example of 2-channel conversion
Converted in the order of ch0 ch1 ch0 ch1 ...
■
Data acquisition timing of CPU unit
● The conversion processing of the analog input unit is not synchronized with the I/O
refreshing timing of the CPU unit.
● Therefore, the latest data is input into the operation memory of the CPU unit when the CPU
unit implements I/O refreshing.
Example of 4-channel conversion
Analog signal
of ch0
Processing in
the analog input
part
Processing in
the CPU unit
Data of ch0
to be read in
the CPU unit
4-10
0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0
Converts in the order of
ch0→ch1→ch2→ch3.
I/O refresh
WUME-FP7TCRTD-04