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8 - 5
8 Analog I/O Slave Unit
GX-series EtherCAT Slave Unit User’s Manual
8-2 Overview of
th
e
Anal
og In
pu
t Slave U
n
it
8
8-2-
1 Input R
ange and C
onverted Da
ta
 Input range
−
10 to +10 V
Voltage of
−
10 to +10 V is converted to data from F060 to 0F40 hex (
−
4000 to +4000). The input
data range for which conversion is possible is
−
11 to +11 V and here the output data is EED0 to
1130 hex (
−
4400 to +4400). 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).
 Input range 4 to 20mA
Current of 4 to 20 mA is converted to data from 0000 to 1F40 hex (0 to 8000). The input data range
for which conversion is possible is 3.2 to 20.8 mA and here the output data is FE70 to 20D0 hex
(
−
400 to +8400). If the input current drops below the input range to lower than 1.2 mA due to
disconnection and so on, the disconnected line detection is activated and the data is set to 7FFF
hex.
The input range is set using the input range switch (DIP switch) of a Slave Unit or by SDO
communications.
When SDO communication is used for the setting, the target index is 3101 hex.
For the set value, refer to the corresponding index of "Appendix A-1 Object Dictionary" in Page A - 43.
For how to set with the input range switch, refer to "Names and functions" in Page 8 - 20.
Input range settings
0 V
−
11V
−
10V
11 V 10 V
Converted data
Hexadecimal (decimal)
Voltage
1130 (4400)
0FA0 (4000)
F060 (
−
4000)
EED0 (
−
4400)
0000 (0)
4 mA
3.2 mA
20 mA
7FFF
20D0 (8400)
1F40 (8000)
FE70 (
−
400)
0000 (0)
20.8 mA
Converted data
Hexadecimal (decimal)
Current
1.2 mA
(Disconnection in case it is less than 1.2 mA)
Clamp at 20.8 mA or higher