Bfm #19: Data Change Prohibition Of Setting Change - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4DA (4-channel Analog Output)
3U
3. Cautions regarding offset/gain data change
• If the analog value specification mode (mode 1 or 4) is used, the offset/gain cannot be changed. However,
the characteristics can be changed as those in the output mode 1 or 4 by setting the following offset and
gain data in the output mode 0 or 2.
Change characteristics from output mode 0 to 1
Change characteristics from output mode 2 to 4
• The offset and gain data should be set before the value write command BFM #9 is executed.
• The resolution cannot be increased by changing the output characteristics.
• When the value specified as the output mode (BFM #0) is changed, the initial value of offset and gain data
in each output mode will be automatically written.
• Even if the output characteristics are changed, the actual valid output range will not be changed:
-10 V to +10 V for the voltage output mode, and 0 mA to 20 mA in the current output mode.
5.4.7

BFM #19: Data change prohibition of setting change

Setting in the following buffer memory areas is prohibited.
• BFM #0 (output mode setting Output mode setting)
BFM #5 (output setting upon PLC stop)
BFM #9 (offset/gain setting value write command)
BFM #10 to #13 (offset data)
BFM #14 to #17 (gain data)
BFM #20 (initialization function)
BFM #32 to #35 (data to be output upon PLC stop)
BFM #38 (upper/lower limit function setting)
BFM #41 to #48 (upper and lower limit values of upper/lower limit function)
BFM #50 (corrective function setting by load resistance)
BFM #51 to #54 (load resistance values)
BFM #60 (status automatic transfer function setting)
BFM #61 (Error status data automatic transfer-to data register specification)
BFM #62 (Upper/lower limit function status with automatic transfer to specified register specification)
BFM #63 (Disconnection detection status with automatic transfer to specified data register specification)
Specify the following value as the setting change prohibition mode (BFM #19).
Set value
K3030
Other than K3030
1. Cautions regarding setting of the setting change prohibition mode
• While changing the setting value, 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 the output
will be restarted.
2. Cautions regarding EEPROM writing
If data is set in BFM #0, #5, #10 to #17, #32 to #35, #50 to #54 or #60 to #63, the data will be written in the
EEPROM of FX
Do not turn off power immediately after writing values in these buffer memories
The maximum number of EEPROM rewritable times is 10,000. Therefore, when creating a program, do not
frequently write data in the above buffer memories (BFM).
E-26
→ For a detailed description of output characteristics change, refer to Chapter 7.
Description
permits data change
disables data change
4DA.
3U-
5 Buffer Memory (BFM)
Offset data Gain data
0 16000
0 16000
Setting range: K3030 or other than K3030
Initial value: K3030
Numeric data type: Decimal (K)
5.4 Buffer Memory Details