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4
FUNCTION
4.2.6
The input range extended mode function is the function increasing the input range of 4 to
20mA and 1 to 5V.
Input range
Input range
4 to 20mA
4 to 20mA
1 to 5V
1 to 5V
(1) Overview
4595 (13787)
4500 (13500)
4000 (12000)
0
-1000 (-3000)
-1096 (-3288)
0
4
Expanded range
Analog input current (mA)
The value in parenthesis refers to the digital output value in high resolution mode.
Figure 4.6 I/O characteristic of input range from 4 to 20mA
(Extended mode)
(2) Setting methods
4
- 16
4.2 Function Details of A/D Conversion
4.2.6 Input range extended mode function
Input range extended mode function
Table 4.4 Input range and digital output value for extended mode
Normal mode
CH1 Digital output value
(Un\G100)
-96 to 4095
(-288 to 12287)
* 1 The values in parenthesis refer to the range of digital outputs for setting high resolution
mode.
(a) The input range extended mode function can monitor the values that fall below
4mA or 1V, so that sensors do not measure concrete values.
(b) The slopes of the lines representing I/O characteristic are same between the
extended mode and the normal mode. However, the input range expands and the
upper and lower limit values of CH1 Digital output value (Un\G100) extend in the
extended mode.
10
20 22
Expanded range
Configure the input range (for CH1 to CH4) in "Switch 1" cell of the Switch setting for
I/O and intelligent function module dialog box. (Refer to Section 7.5.2.)
POINT
If the input range extended mode function, scaling function (for A/D conversion),
and shifting function (for A/D conversion) are used simultaneously, the scaling
value can exceed the range from -32768 to 32767.
In such a case, the values set within the upper limit (32767) and lower limit (-
32767) values will be stored into the buffer memory as scaling values.
Input range
4 to 20mA
(Extended
mode)
*1
1 to 5V
(Extended
mode)
4595 (13787)
4500 (13500)
4000 (12000)
0
-1000 (-3000)
-1096 (-3288)
Expanded range
The value in parenthesis refers to the digital output value in high resolution mode.
Figure 4.7 I/O characteristic of input range from 1 to 5V
Extended mode
Increased
CH1 Digital output value
range
(Un\G100)
0.0 to 22.0mA
-1096 to 4595
(-3288 to 13787)
0.0 to 5.5V
0
1
5 5.5
Expanded range
Analog input voltage (V)
(Extended mode)
*1
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