Mitsubishi FX3U-4AD User Manual

D-8
2 Specifications
2.3 A/D Conversion Time
FX 3G /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3G-2AD-BD (2-channel analog Input)
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."
FX 3G Series PLC
Sequence Program
END instruction
A
/D conversion
start command
A/D
conversion
1st
180µs
/2ch
FX
3G -2AD-BD FX 3G -2AD-BD
180µs
/2ch
2nd
A/D
conversion
Digital value
writing
Digital value
writing
A/D conversion
start command

Mitsubishi FX3U-4AD Specifications

General

Brand	Mitsubishi
Model	FX3U-4AD
Category	Controller
Language	English