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F-8
2 Specifications
2.4 D/A Conversion Time
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA-ADP (4-channel analog Output)
2.4 D/A Conversion Time
This section describes the D/A conversion time.
2.4.1 When connected to a FX3U, FX3UC PLC
1. D/A conversion and special data register update timing
D/A conversion is performed at every scan time of the PLC.
During execution of the END instruction, the PLC writes the output setting data of the special data registers,
performs D/A conversion of the data, and updates the analog output data.
2. D/A conversion during PLC stop
If the output holding function cancellation setting is disabled by the special device, the offset value will be
output.
If the output holding function cancellation setting is enabled, the output at switching from RUN to STOP will be
latched.
Just after power-on, however, the offset value will be output until operation begins.
3. If two or more analog special adapters are connected
During execution of the END instruction, data in all the connected adapters will be subject to D/A conversion
and then output (in the order of 1st adapter → 2nd adapter... 4th adapter).
4. D/A conversion speed (data update time)
During execution of END instruction, the output setting digital data per of 4 channel will be subject to D/A
conversion which takes 200μs, after which the analog data will be output.
END instruction execution time will be "200μs × number of connected adapters."
FX
3U
/FX
3UC
Series PLC
FX
3U
-4DA-ADP
1st
FX
3U
-4DA-ADP
n'th
D/A
conversion
200μs
/4ch
D/A
conversion
200μs/4ch
Digital value
writing
D/A conversion
start command
END instruction
Sequence
program
Digital value writing
D/A conversion
start command