Input Range Extended Mode Function - Mitsubishi L Series User Manual

8.4

Input Range Extended Mode Function

Using this function, the available input range in 4 to 20mA and 1 to 5V can be extended.
Normal mode
Input range
Input range
setting
4 to 20mA 4 to 20mA
1 to 5V 1 to 5V
(1) Overview
• The analog input value can be monitored in the extended mode even if errors vary depending on sensors
and the analog input value is less than 4mA or 1V in the input range of 4 to 20mA and 1 to 5V.
• The slope of Input/output characteristic of the extended mode is the same as that of the normal mode.
However, the upper limit value and the lower limit value of the input range and the digital output value are
extended.
• The resolution is the same between the extended input range and the input range of 4 to 20mA and 1 to 5V.
This enables the A/D conversion with higher resolution compared to the use of the input range of 0 to 20mA
and 0 to 5V.
Input/output characteristic in 4 to 20mA (extended mode)
Digital output value
22979
22500
20000
4 to 20mA
(extended mode)
0
-5000
-5480
0 4 10
Extended
For details on the current input characteristic and voltage input characteristic, refer to the following.
• I/O conversion characteristic of A/D conversion (
(2) Setting procedure
Set the input range into the extended mode in the input range setting of the switch setting.
If the input range extended mode function, scaling function, shift function, and difference conversion function are
simultaneously used, the digital output value may exceed the range of -32768 to 32767.
In this case, a value fixed at the upper limit value (32767) or at the lower limit value (-32768) is stored as a scaling value
(digital operation value).
• Processing each function (
Digital output value
0 to 20000
4 to 20mA
20 22 Analog input current (mA)
Extended
Page 61, Section 8.1)
Extended mode
Input range
Input range
setting
4 to 20mA
0.0 to 22.0mA
(Extended mode)
1 to 5V
0.0 to 5.5V
(Extended mode)
Input/output characteristic in 1 to 5V (extended mode)
Digital output value
22979
22500
20000
1 to 5V
(extended mode)
0
-5000
-5480
0 1
Extended
Page 203, Appendix 3)
CHAPTER 8 FUNCTIONS
Digital output value
-5000 to 22500
1 to 5V
5 5.5 Analog input voltage (V)
Extended
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