Mitsubishi Electric MELSEC-FX3S Series - Programming; Loading;Writing of Conversion Data

H-18
4 Programming
4.1 Loading/Writing of Conversion Data
FX 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX 3U -3A-ADP (2-channel Analog Input, 1-channel Analog Output)
4. Programming
This chapter explains how to create programs for inputting and outputting analog data using the 3A-ADP.
4.1 Loading/Writing of Conversion Data
Loading of A/D Conversion Data
1) The input analog data will be converted into digital data and then stored in the special devices of the
FX
3S/FX3G/FX3GC/FX3U/FX3UC Series PLC.
2) If the data is stored in the special devices, the averaging time can be set, and the input mode can be
specified.
3) Special auxiliary relays (10 points) and special data registers (10 points) are assigned automatically
starting from the adapter nearest the main unit.
Writing of D/A Conversion Data
1) The input digital data will be converted into analog data and then output to the terminals.
2) If data is stored in the special devices, the averaging time can be set, and the output mode can be
specified.
3) Special auxiliary relays (10 points) and special data registers (10 points) are assigned automatically
starting from the adapter nearest the main unit.
→ For a detailed description of special device assignment, refer to Section 4.2.
•FX
3S Series PLC
•FX
3G/FX3GC Series PLC
The analog special adapter nearest to the main unit is counted as the 1st analog special adapter, and the
next adapter as the 2nd analog special adapter. However, in this case, do not include the connecter
conversion adapter and the communication special adapter.
*1. The second special adapter is not available in the FX
3G Series PLC (14-points and 24-points type).
*2. A connector conversion adapter is required to connect the FX
3U-3A-ADP to the FX3G Series PLC.
Sequence
program
Special devices
A/D
or
D/A
Communi-
cation
special
adapter
FX 3U -3A
-ADP
FX 3S -CNV
-ADP
Special auxiliary relays:
M8280 to M8289
Special data registers:
D8280 to D8289
FX 3S Series PLC
FX 3G /FX 3GC Series PLC
*2
Communi-
cation
special
adapter
A/D
or
D/A
A/D
or
D/A
FX
3U -3A
-ADP
FX 3U -3A
-ADP
2nd
*1
1st
Sequence
program
Special devices
Special auxiliary relays:
M8280 to M8289
Special data registers:
D8280 to D8289.
Special auxiliary relays:
M8290 to M8299
Special data registers:
D8290 to D8299.