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2. PERFORMANCE
2.5.2 Interface specifications
Item
Number of input points
Built-in function
Isolation method
Rated input voltage
Rated input current
Operating voltage range
Max. number of simultaneous
input points
ON voltage/ON current
OFF voltage/OFF current
Input resistance
Response
OFF → ON
time
ON → OFF
Common method
External switch
A4
A5
A6
B4
B5
-
+
B6
+
-
24VDC
Encoder
A7/B7
24VDC
-
+
A8/B8
Encoder
A9/B9
24VDC
-
+
A10/B10
Table 2.10 gives the high-speed counter function interface specification list of the
A1FXCPU.
Table 2.10 Specification List
External input
4 points (X6 to 9)
Preset 2 channels × 1 point
Disable/latch trigger 2 channels × 1 point
24VDC
18V/3.5mA or more
3V/0.7mA or less
4.7k Ω
0.5ms or less
0.5ms or less
10 points-1 common (2 terminals)
(Common to X0 to 9)
Internal circuit
R
Internal
R
circuit
Photocoupler
R
Internal
R
circuit
Photocoupler
R
Internal
R
circuit
Photocoupler
Specifications
Photocoupler isolation
5mA
21.6 to 26.4VDC (ripple ratio within 5%)
100% simultaneous ON
External wiring
B16
A16
B15
A15
B14
A14
B13
A13
B12
A12
B11
A11
B10
A10
B9
A9
B8
A8
B7
A7
B6
A6
B5
A5
B4
A4
B3
A3
B2
A2
B1
A1
Module side
––-:Indicates the terminal which is not used with this function.
2 - 15
MELSEC-A
Counter input
4 points (XA to D)
Counter input 2 channels × 2 points
24VDC
8mA
19V/5.5mA or more
3V/0.25mA or less
2.7k Ω
60kpps or less
60kpps or less
All points with independent commons
Terminal
Signal
Terminal
Number
Name
Number
B16
─
A16
B15
─
A15
B14
─
A14
B13
─
A13
B12
─
A12
B11
─
A11
B10
A10
XD
B9
A9
B8
A8
XB
B7
A7
B6
COM1
A6
B5
X9
A5
B4
X7
A4
B3
─
A3
B2
─
A2
B1
─
A1
Signal
Name
─
─
─
─
─
─
XC
XA
COM1
X8
X6
─
─
─
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