Справочник Пользователя для Mitsubishi Electronics MELSEC-F
F-9
2 Specifications
2.4 D/A Conversion Time
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4DA-ADP (4-channel analog Output)
A
Comm
on I
te
te
ms
B
FX
3U
-4AD
FX
3UC
-4
A
D
C
FX
3U
-4A
D
D
-A
D
P
D
FX
3G
-2A
D
D
-BD
E
FX
3U
-4DA
F
FX
3U
-4D
A
A
-AD
P
P
G
FX
3G
-1D
A
A
-BD
H
FX
3U
-3
A-
ADP
I
FX
3U
-4
A
D
-P
T
-
A
D
P
J
FX
3U
-4A
D
D
-P
TW
-
A
A
D
P
2.4.2
When connected to a FX
3G
PLC
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 the 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.
During execution of the 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 PLC stop
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.
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 analog special adapters are connected
During execution of the END instruction, data in all the connected adapters will be subject to D/A conversion
and then output (in the order of 1st adapter
and then output (in the order of 1st adapter
→ 2nd adapter).
4. D/A conversion speed (data update time)
During execution of END instruction, the output setting digital data per of 4 channel will be subject to D/A
conversion which takes 250
conversion which takes 250
μs, after which the analog data will be output.
END instruction execution time will be "250
μs × number of connected adapters."
FX
3G
Series PLC
FX
3U
-4DA-ADP
1st
FX
3U
-4DA-ADP
2nd
D/A
conversion
250
μs
/4ch
D/A
conversion
250
μs/4ch
Digital value
writing
D/A conversion
start command
END instruction
Sequence
program
Digital value writing
D/A conversion
start command