Mitsubishi Electric MELSEC-FX3S Series Manual page 414

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD-PTW-ADP (4-channel Platinum Resistance Thermometer Data Input)
3U
2.4.2 When connected to a FX
1. A/D conversion and special data register update timing
A/D 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.
FX -4AD-PTW-ADP
3U
conversion
250 s/4ch
2. A/D conversion during PLC stop
Even if the PLC is stopped, A/D conversion will be performed and the special data registers will be updated.
3. If two analog special adapters are connected
During execution of the END instruction, data will be read out from all the connected adapters (in the order of
1st adapter → 2nd adapter).
4. A/D conversion speed (data update time)
During execution of the END instruction, the A/D converted data of all 4 channels will be read out in 250 μs,
and the data read out will be written to the special data registers.
END instruction execution time will be "250 μs × number of connected adapters."
J-10
PLC User's Manual - Analog Control Edition
3UC
/FX
3G 3GC
FX -4AD-PTW-ADP
3U
2nd
conversion
250 s/4ch
A/D
PLC
1st
A/D conversion start
command
A/D
Digital value reading
A/D conversion start
command
Digital value reading
2 Specifications
2.4 A/D Conversion Time
FX /FX Series PLC
3G 3GC
Sequence
program
END instruction