Mitsubishi Electric MELSEC-FX3S Series - When Connected to a FX 3 S PLC

F-9
2 Specifications
2.4 D/A Conversion Time
FX 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3U-4DA-ADP (4-channel Analog Output)
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
2.4 D/A Conversion Time
This section describes the D/A conversion time.
2.4.1 When connected to a FX3S 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 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. 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 250 μs, after which the analog data will be output.
END instruction execution time will be 250 μs.
FX 3S Series PLC
FX
3U -4DA-ADP
D/A
conversion
250

s
/4ch
Digital value
writing
D/A conversion
start command
END instruction
Sequence
program