Mitsubishi FX3U-4AD User Manual page 349

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
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
2nd
A/D
conversion
250µs/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 250µs,
and the data read out will be written to the special data registers.
END instruction execution time will be "250µs × number of connected adapters."
2.5 Temperature Measurement
To stabilize the temperature measurement, warm-up the system for 30 minutes or more after power-on.
PLCs
3G
FX -4AD-PTW-ADP
3U
1st
A/D conversion start
command
A/D
conversion
Digital value writing
250µs/4ch
A/D conversion start
command
Digital value writing
2 Specifications
2.5 Temperature Measurement
FX Series PLC
3G
Sequence
program
END instruction
A
B
C
D
E
F
G
H
I
J
I-9