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MELSEC-A
1 OVERVIEW
1
1 OVERVIEW
This user's manual describes the handling, specifications and programing method of
the A1S66ADA type Analog I/O Module (hereafter referred to as A1S66ADA), which is
utilized in combination with the MELSEC-A series CPU module (hereafter referred to
as PLC CPU).The A1S66ADA is a special module with a four-channel analog input
and two-channel analog output.
(Hereinafter, D/A conversion shall mean digital to analog conversion and A/D
conversion shall mean analog to digital conversion.)
(1) D/A conversion
Digital values are converted to analog values such as voltage and current, and
output externally.
100
200
400
500
300
-100
-300
200
(V)
+
–
0
t
Digital values
Analog values
(2) A/D Conversion
Analog values such as voltage and current are converted to digital values so they
can be imported into the PLC CPU.
(V)
+
–
(V)
+
–
0
t
t
0
Digital values
Analog values
The voltage, current and digital values that the A1S66ADA may input or output
are ranged as follows:
Voltage I/O range······0 to 10 V, 1 to 5 V, -10 to 10 V, 0 to 20 mA (switched by
range)
Current I/O range······0 to 20 mA, 4 to 20 mA (switched by range)
Digital output value····0 to 4095 (12 bit binary value)
Digital input value······0 to 4000 (12 bit binary value)
Summary of Contents for A1S66ADA
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