A/D Conversion Time - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -2AD-BD (2-channel analog Input)
3G
2.3

A/D Conversion Time

This section describes the A/D conversion time.
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.
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 expansion boards are connected
During execution of the END instruction, data will be read out from all the connected boards (in the order of
1st board → 2nd board).
4. A/D conversion speed (data update time)
During execution of END instruction, the A/D converted data of all 2 channels will be read out in 180µs, and
the data read out will be written to the special data registers.
END instruction execution time will be "180µs × number of connected analog boards."
D-8
FX
Sequence Program
END instruction
A/D conversion Digital value
start command writing
A/D
conversion
180µs
/2ch
FX -2AD-BD
3G
1st
Series PLC
3G
A/D conversion
start command
A/D
conversion
180µs
/2ch
FX -2AD-BD
3G
2nd
2 Specifications
2.3 A/D Conversion Time
Digital value
writing