Conversion Time - Mitsubishi Electric FX3G User Manual

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FX
/FX
/FX
/FX
/FX
3S
3G
3GC
3U
3UC
FX
-3A-ADP (2-channel Analog Input, 1-channel Analog Output)
3U
2.4

Conversion Time

This section describes the conversion time.
2.4.1
When connected to a FX
1. Conversion and special data register update timing
A/D and D/A conversion is performed at every scan time of the PLC.
During execution of END instruction, the PLC performs A/D conversion, reads out the A/D converted data,
and then writes the data in the special data registers.
The PLC writes output setting data to special data registers, performs D/A conversion, and updates analog
output values.
2. Conversion during PLC STOP
1) A/D conversion
Even if the PLC is stopped, A/D conversion will be performed and the special data registers will be
updated.
2) D/A conversion
If the output holding function cancellation setting is enabled by the special device, the offset value will be
output.
If the output holding function cancellation setting is disabled, 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. Conversion speed (data update time)
1) A/D conversion
During execution of END instruction, the A/D converted data of "90 μs for each selected input channel",
and the data read out will be written to the special data registers.
END instruction execution time will be 90 μs for each selected input channel.
2) D/A conversion
During execution of END instruction, the output setting digital data per of "50 μs for each selected output
channel", after which the analog data will be output.
END instruction execution time will be 50 μs for each selected output channel.
PLC User's Manual - Analog Control Edition
PLC
3S
FX
-3A-ADP
3U
A/D conversion
A/D,D/A conversion
90 s for each
start command
selected input
channel
Digital value writing
+
D/A conversion
50 s for each
Digital value reading
selected output
channel
FX
Series PLC
3S
Sequence
program
End instruction
2 Specifications
2.4 Conversion Time
A
B
C
D
E
F
G
H
I
J
H-9

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