Mitsubishi MELSEC-F FX3U Series User Manual

D-9
2 Specifications
2.4 D/A Conversion Time
FX 3U /FX 3UC Series PLC User's Manual - Analog Control Edition
FX3U-4DA-ADP (4-channel analog Output)
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction (FNC 88)
2.4 D/A Conversion Time
This section describes the D/A conversion time.
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 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.
2. D/A conversion during stoppage of PLC
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 or more analog special adapters are connected
During execution of 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... 4th adapter).
4. D/A conversion speed (data update time)
During execution of END instruction, the output setting digital data of 4 channels will be subject to D/A
conversion in 200µs, and analog data will be output.
END instruction execution time will be "200µs × number of connected adapters."
FX 3U /FX 3UC Seriese PLC
FX 3U -4DA-ADP
1st
FX 3U -4DA-ADP
n'th
D/A
conversion
200
µ s
/4ch
D/A
conversion
200 µ s/4ch
Digital value
writing
D/A conversion
start command
END instruction
Sequence
program
Digital value writing
D/A conversion
start command

Mitsubishi MELSEC-F FX3U Series Specifications

General

Brand	Mitsubishi
Model	MELSEC-F FX3U Series
Category	Controller
Language	English