3-1
Section
Analog I/O Units
184
The open-circuit detection function is enabled or cleared when data is con-
verted. If the input returns to the convertible range, the open-circuit detection is
cleared automatically and the output returns to the normal range.
Using Analog I/O
Set the I/O ranges.
Connect the Unit.
Wire the analog I/O.
Program operation in the
ladder program.
Analog inputs: 0 to 5 VDC, 1 to 5 VDC, 0 to 10 VDC,
–10 to 10 VDC, 0 to 20 mA, or 4 to 20 mA
Analog output: 1 to 5 VDC, 0 to 10 VDC, –10 to 10 VDC,
0 to 20 mA, or 4 to 20 mA
Set inputs as voltage or analog and set the averaging function.
Connect the Analog I/O Unit.
Connect analog I/O devices.
Write the range code.
Analog inputs: Read converted data.
Analog output: Write set values.
Analog Inputs
CPU Unit
Analog I/O Unit
Ladder program
Word (n + 1)
MOVE instruction
Writes the range code.
Reads the converted
values.
Where “m” is the last input word and “n” is the
last output word allocated to the CPU Unit, or
previous Expansion Unit or Expansion I/O Unit.
Analog devices
Temperature sensor
Pressure sensor
Speed sensor
Flow sensor
Voltage/current meter
Other
Word (m + 1)
Word (m + 2)
Range code
Analog input 0
converted value
Analog input 1
converted value
(21)
