Buffer Memory Details - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC
5.4

Buffer Memory Details

5.4.1 BFM #0: Input mode specification
Specify the input modes of channel 1 to 4.
4 hexadecimal digits are assigned to specify the input modes of the 4 channels.
Change the value of each digit to change the input mode of each channel. 0 to 8 or F can be set for each digit.
H
ch4
ch3
The different types of input modes are shown in the following table:
Set value
[HEX]
0
1
*1
2
3
4
*1
5
6
7
*1
8
9 to E
F
*1. The offset/gain values cannot be changed.
1. Cautions regarding input mode setting
• If the input mode is set (changed), the analog input characteristics will be changed automatically.
Furthermore, when the offset/gain value is changed, the characteristics can be set to the desired values.
(The resolution cannot be changed.)
• If the analog value direct indication (*1) is specified, the offset/gain value cannot be changed.
• It takes approximately 5 seconds to determine the input mode. For this reason, after changing the input
mode, be sure to wait for 5 seconds or more before writing other data.
• HFFFF (no channels used) cannot be set.
2. 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.
The maximum number of EEPROM rewrites is 10,000 times. Therefore, when creating a program, do not
frequently write data to the above buffer memories (BFM).
B-28
ch1
ch2
→ For a detailed description of input characteristics, refer to Section 2.4.
Input mode
Voltage input mode
Voltage input mode
Voltage input
Analog value direct indication mode
Current input mode
Current input mode
Current input
Analog value direct indication mode
Current input mode
Current input mode
Current input
Analog value direct indication mode
Setting not possible
Channel not used
Initial value (at delivery): H0000
Numeric data type: Hexadecimal (H)
Analog input Digital output
range range
-10V to +10V -32000 to +32000
-10V to +10V -4000 to +4000
-10V to +10V -10000 to +10000
4mA to 20mA 0 to 16000
4mA to 20mA 0 to 4000
4mA to 20mA 4000 to 20000
-20mA to +20mA -16000 to +16000
-20mA to +20mA -4000 to +4000
-20mA to +20mA -20000 to +20000
-
-
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
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