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8.5 Input Range Extended Mode Function This function extends the input range of 4 to 20mA and that of 1 to 5V. Normal mode Input range setting Input range 4 to 20mA 4 to 20mA Extended mode Input range setting Input range 4 to 20mA (Extended mode) 0.0 to 20.0mA 1 to 5V (Extended mode) 0.0 to 5.0V Digital output value Digital output value -8000 to 32000 0 to 32000 1 to 5V 1 to 5V (1) Overview • An analog input value can be monitored even when an error in measurement is great and the value is less than 4mA or 1V in the input range of 4 to 20mA and 1 to 5V. • Although the slope of the I/O characteristic in the extended mode is the same as that in the normal mode, 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 as that the input range of 4 to 20mA and 1 to 5V has. Therefore, A/D conversion with higher resolution than that of the input range of 0 to 20mA and 0 to 5V is achieved. Input/output characteristic in 4 to 20mA (Extended mode) Input/output characteristic in 1 to 5V (Extended mode) Digital output value Digital output value 32767 32000 32767 32000 4 to 20mA (Extended mode) 4 to 20mA 1 to 5V Extended the mode to 0 to 20mA. 1 to 5V (Extended mode) 0 0 -8000 -8768 0 4 10 20 -8000 -8768 0 Analog input current (mA) 1 Extended Extended 5 Analog input voltage (V) Extended For details on the current input characteristic and the voltage input characteristic, refer to the following. • I/O Conversion Characteristic of A/D Conversion ( Page 279, Appendix 3) (2) Setting procedure Set with the input range setting of the switch setting. When the input range extended mode function is used with the scaling function, the shift function, and the difference conversion function, digital output values may exceed the range of -32768 to 32767. In that case, the value fixed at the upper limit value (32767) or the lower limit value (-32768) is stored as a digital operation value. • Processing Each Function ( 94 Page 71, Section 8.2)
