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1 OVERVIEW
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
(2) A/D Conversion
(V)
+
0
–
1 - 1
Digital values are converted to analog values such as voltage and current, and
output externally.
Digital values
100
300
200
-100
400
-300
500
200
Analog values such as voltage and current are converted to digital values so they
can be imported into the PLC CPU.
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)
(V)
+
0
–
(V)
+
t
0
–
MELSEC-A
1
Analog values
t
Digital values
t
1 - 1
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