3-1
Section
Analog I/O Units
169
Using Analog I/O
Set the I/O range
Connect the Unit
Wire the analog I/O
Create a ladder program
Analog inputs:
0 to 10 V, 1 to 5 V, or 4 to 20 mA
Analog outputs:
0 to 10 V, –10 to +10 V, or 4 to 20 mA
Connect the Analog I/O Unit.
Connect an analog input device.
Write the range code.
Analog input:
Read converted data.
Analog output:
Write set value.
Analog Inputs
CPU Unit
Analog I/O Unit
Ladder program
Word (n + 1)
MOVE instruction
Writes the range code.
Reads the conversion
value.
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
Word (m + 1)
Word (m + 2)
Range code
Analog input 1
conversion value
Analog input 2
conversion value
(21)