Mitsubishi MELSEC-F FX3U Series User Manual

B-25
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 Details of Buffer Memories
5.4.1 BFM #0: Input mode specification
Initial value (at delivery): H0000
Numeric data type: Hexadecimal (H)
Specify the input modes of channel 1 to 4.
Hexadecimal numbers are preliminarily assigned to 4 digits to specify the input modes of 4 channels.
Change the set number of each digit to change the input mode of each channel. 0 through 8 and F can be set
for each digit.
Various types of input modes are shown in the following table:
→ For a detailed description of input characteristics, refer to Section 2.4.
*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 automatically changed. In
addition, if the offset/gain value is changed, the characteristics can be set to the desired value. (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, and then write the other data.
• HFFFF (use of no channels) cannot be set.
2. 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.
The maximum number of EEPROM rewritable times is 10,000 times. When creating a program, therefore, do
not frequently write data in the above buffer memories (BFM).
Set value
[HEX]
Input mode
Analog input
range
Digital output
range
Resolution
0 Voltage input mode -10V to +10V -32000 to +32000 0.32mV
1 Voltage input mode -10V to +10V -4000 to +4000 2.50mV
2
*1
Voltage input
Analog value direct indication mode
-10V to +10V -10000 to +10000 1.00mV
3 Current input mode 4mA to 20mA 0 to 16000 1.25µA
4 Current input mode 4mA to 20mA 0 to 4000 5.00µA
5
*1
Current input
Analog value direct indication mode
4mA to 20mA 4000 to 20000 1.25µA
6 Current input mode -20mA to +20mA -16000 to +16000 1.25µA
7 Current input mode -20mA to +20mA -4000 to +4000 5.00µA
8
*1
Current input
Analog value direct indication mode
-20mA to +20mA -20000 to +20000 1.25µA
9 to E Setting not possible - - -
F No channels used - - -
H
ch4
ch3
ch2
ch1

Mitsubishi MELSEC-F FX3U Series Specifications

General

Brand	Mitsubishi
Model	MELSEC-F FX3U Series
Category	Controller
Language	English