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8 - 3
8 Analog I/O Slave Unit
GX-series EtherCAT Slave Unit User’s Manual
8-2 Overview of
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Anal
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8-2-
1 Input R
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8-2 Overview of the Analog Input Slave
Unit
Analog Input Slave Unit convert (AD conversion) analog input signals such as 1 to 5 V and 4 to 20 mA
to digital data (binary values) and store them in the EtherCAT Master Unit.
Input analog signals are converted to digital data in the following manner using a set input range.
If the input data exceeds the data range for which conversion is possible, the converted data is fixed to
the maximum or minimum value of the range.
 Input range 0 to 5 V
Voltage of 0 to 5 V is converted to data from 0000 to 1F40 hex (0 to 8000). The input data range for
which conversion is possible is
−
0.25 to 5.25 V and here the output data is FE70 to 20D0 hex (
−
400
to 8400). When input data is a negative voltage, it is expressed as the two's complement
(hexadecimal) and the output data for a disconnected line is the same as for an input of 0 V (0000
hex).
8-2-1 Input Range and Converted Data
Input Range and Converted Data
0 V
−
0.25 V
5 V 5.25 V
20D0 (8400)
1F40 (8000)
FE70 (
−
400)
0000 (0)
Converted data
Hexadecimal (decimal)
Voltage