B-29
5 Buffer Memory (BFM)
5.4 Details of Buffer Memories
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction
(FNC 88)
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3UC-4AD (4-channel Analog Input)
5.4.5 BFM #19: Data change prohibit
Setting range: K2080, or value other than K2080
Initial value (at delivery): K2080
Numeric data type: Decimal (K)
Setting of the following BFMs is prohibited.
• Input mode specification (BFM #0) • Initialization function (BFM #20)
• Input characteristics writing (BFM #21)q • 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)
Set data in BFM #19 (buffer memory for inhibition of data change) as follows:
1. Caution regarding EEPROM writing
If data is set in BFM #0, #19, #21, #22, #125 to #129, or #198, the data will be written in the EEPROM of 4AD.
→ For a detailed description of cautions 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 the data in BFM #0 through #6999, and to reset FX
3UC-4AD to the factory
default status.
Set "K1" to initialize all the data. At the completion of initialization, "K0" will be set automatically.
1. Caution regarding initialization function setting
It takes approximately 5 seconds to initialize all the data.
5.4.7 BFM #21: Input characteristics writing
Initial value: H0000
Numeric data type: Hexadecimal (H)
Channel numbers are assigned to 4 lower bits of BFM #21. If one of these bits is turned on, the offset data
(BFM #41 to #44) and the gain data (BFM #51 to #54) 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 #21
The WRITE command can be given to two or more channels at the same time. (Set "H000F" to write data of
all the channels in the EEPROM.) At the completion of writing, "H0000" (b0 to b3: OFF) will be set automatically.
Set value Description
K2080 Data change will be permitted.
Value other than K2080 Data change will be inhibited.
Set value Description
K0 Normal
K1 Initializes all the 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.
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