Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
B-31
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
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
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4AD/FX
3UC
-4AD (4-channel Analog Input)
5.4.5
BFM #19: Data change disable
Setting range: K2080, or value other than K2080
Initial value (at delivery): K2080
Numeric data type: Decimal (K)
Disables adjustment of the following BFMs:
• Input mode specification (BFM #0)
• Input mode specification (BFM #0)
• Initialization function (BFM #20)
• Input characteristics writing (BFM #21)
• Convenient functions (BFM #22)
• Offset data (BFM #41 to #44)
• Gain data (BFM #51 to #54)
• Automatic transfer-to data register specification (BFM #125 to #129)
• Data history sampling time setting (BFM #198)
• Data history sampling time setting (BFM #198)
Set the value of BFM #19 (Data change disable) as follows:
1. Caution regarding EEPROM writing
If data is written to BFM #0, #19, #21, #22, #125 to #129, or #198, the data will also be written to the 4AD
EEPROM.
EEPROM.
→ For a detailed description of caution regarding EEPROM writing, refer to Subsection 5.4.1.
5.4.6
BFM #20: Initialization function (resetting to factory default status)
Setting range: K0 or K1
Initial value: K0
Numeric data type: Decimal (K)
Use this function to initialize all data in BFM #0 to #6999, to the factory default status.
Set "K1" to initialize all data. When initialization is complete, "K0" will be set automatically.
1. Caution regarding initialization function setting
• It takes approximately 5 seconds to initialize all the data.
• Priority is given to BFM #19 which prevents a data from being changed. To initialize, set K2080 in BFM #19.
• Priority is given to BFM #19 which prevents a data from being changed. To initialize, set K2080 in BFM #19.
5.4.7
BFM #21: Input characteristics writing
Initial value: H0000
Numeric data type: Hexadecimal (H)
Channel numbers are assigned to the 4 lower bits of BFM #21. If any of these bits are turned on, the offset
data (BFM #41 to #44) and gain data (BFM #51 to #54) of the corresponding channel will be written to the
internal memory (EEPROM). When written to the internal memory, the data will become valid.
data (BFM #41 to #44) and gain data (BFM #51 to #54) of the corresponding channel will be written to the
internal memory (EEPROM). When written to the internal memory, the data will become valid.
1. BFM #21 bits channel number assignment
The WRITE command can be given to two or more channels at the same time. (Set "H000F" to write all
channel data to the EEPROM.) When writing is complete, "H0000" (b0 to b3: OFF) will be set automatically.
channel data to the EEPROM.) When writing is complete, "H0000" (b0 to b3: OFF) will be set automatically.
Set value
Description
K2080
Data change enabled.
Value other than K2080
Data change disabled.
Set value
Description
K0
Normal
K1
Initializes all data
Bit No.
Description
b0
Channel-1 offset data (BFM #41) and gain data (BFM #51) writing
b1
Channel-2 offset data (BFM #42) and gain data (BFM #52) writing
b2
Channel-3 offset data (BFM #43) and gain data (BFM #53) writing
b3
Channel-4 offset data (BFM #44) and gain data (BFM #54) writing
b4 to b15
Not used.