Mitsubishi Electric MELSEC-FX3S Series Manual page 238

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4DA (4-channel Analog Output)
3U
5.4.5 BFM#9: Offset/gain setting value write command
Channel numbers are assigned to 4 lower bits of BFM#9. If one of those bits is turned on, the offset data
(BFM#10 to #13) and the gain data (BFM#14 to #17) of the corresponding channel will be written in the
internal memory (EEPROM). When written in the internal memory, the data will be valid.
1. Channel number assignment to each bit of BFM#9
Bit No.
b0
b1
b2
b3
b4 to b15
The WRITE command can be given to two or more channels at the same time. (Set "H000F" to write the data
of all the channels in the EEPROM.)
On completion of writing, "H0000" (b0 to b3: OFF) will be set automatically.
2. Cautions regarding giving offset/gain setting value write command
• While changing the setting, the output is stopped, and H0000 is automatically written in the output status
(BFM#6).
At the completion of writing, the output status (BFM#6) will automatically change to H1111, and output will
be restarted.
• If the analog value specification mode (mode 1 or 4) is used, the offset/gain cannot be changed.
When other output mode has been set, it is possible to change to same characteristics as those in the
output mode 1 or 4.
• If the write command is not executed, the offset and gain data will not be stored in the EEPROM.
• When b1 of the error status (BFM#29) is set to ON, the offset and gain data will not be stored in the
EEPROM.
E-24
PLC User's Manual - Analog Control Edition
3UC
Channel-1 offset data (BFM#10) and gain data (BFM#14) writing
Channel-2 offset data (BFM#11) and gain data (BFM#15) writing
Channel-3 offset data (BFM#12) and gain data (BFM#16) writing
Channel-4 offset data (BFM#13) and gain data (BFM#17) writing
Not used
→ For a detailed description of offset and gain setting, refer to Subsection 5.4.6.
Description
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Initial value: H0000
Numeric data type: Hexadecimal (H)