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MELSEC-
A
3 SPECIFICATIONS
3.4 General-purpose input/output specifications
The general-purpose input/output specifications of the R2 are shown below.
(1) General-purpose input specifications
DC input (Positive common/negative common shared type)
R2 External connection view
No. of input points 2 points
Insulation method Photo coupler insulation
Rated input voltage 24VDC
Rated input current Approx. 7mA
Working voltage range 19.2 to 28.8VDC (ripple rate within 5%)
Max. No. of simultaneous
input points
100%
ON voltage/ON current 14V or more/3.5mA or more
OFF voltage/OFF current 6V or less/1.7mA or less
Input resistance
Approx. 3.3k
Ω
OFF ON 10ms or less
Response
time
ON OFF 10ms or less
Common method
2 points/common (COM1)
Positive common/negative common shared
type
2
COM1
3XD
1XC
24VDC
Internal
circuit
External connection
method
7-point terminal block (M3.5 screw)
Terminal
No.
Signal
name
Terminal
No.
Signal
name
Applicable wire size
0.75 to 2mm
2
TB1 XC TB3 XD
Applicable crimp terminal
RAV1.25-3.5, RAV2-3.5 (JIS C 2805
compliant)
TB2 COM1 TB4 NC