Mitsubishi FX3U-4AD User Manual page 273

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4DA-ADP (4-channel analog Output)
3U
2.4.2 When connected to a FX
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.
FX -4DA-ADP
3U
2nd
D/A
conversion
250µs/4ch
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 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).
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 250µs, after which the analog data will be output.
END instruction execution time will be "250µs × number of connected adapters."
PLC
3G
FX -4DA-ADP
3U
1st
Digital value
D/A writing
conversion
D/A conversion
250µs
start command
/4ch
Digital value writing
D/A conversion
start command
2 Specifications
2.4 D/A Conversion Time
FX Series PLC
3G
Sequence
program
END instruction
A
B
C
D
E
F
G
H
I
J
F-9