76
6.7
Wiring Example (Between a High-Speed Counter Module
and an Encoder)
(1) Example of wiring with an open collector output type encoder (24VDC)
When wiring the high-speed counter module and an encoder, separate power cables and signal cables. The following figure
shows examples.
●
Example of correct wiring
●
Example of incorrect wiring
4.1k
270
240
820
DIF
5V
24V
COM
External
power
supply
High-speed counter module
Phase A
Phase B
Phase Z
B19(B13)
A20(A14)
B20(B14)
A19(A13)
4.1k
270
240
820
DIF
5V
24V
COM
B17(B11)
A18(A12)
B18(B12)
A17(A11)
4.1k
270
240
820
DIF
5V
24V
COM
B15(B09)
A16(A10)
B16(B10)
A15(A09)
Shielded twisted pair cable
Encoder
24V
OUT
24V
OUT
24V
OUT
E
0V
24VDC
Shielded twisted pair cable
Pulse input
24V
High-speed
counter module
COM
External
power
supply
24VDC
0V
Encoder
OUT
+24V
0V
E
Shielded twisted pair cable
Pulse input
24V
High-speed
counter module
COM
External
power
supply
24VDC
0V
Encoder
OUT
+24V
0V
E
Because a current flows through
the shielded twisted pair cables
in the same direction,
canceling effect does not work
and pulses become susceptible
to electromagnetic induction.
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