High-Speed Input and
Pulse Output Features
3–19
High-Speed Input and Pulse Output Features
A general wiring diagram for encoders to the DL05 in HSIO Mode 20 is shown below.
Encoders with sinking outputs (NPN open collector) are probably the best choice for
interfacing. If the encoder sources to the inputs, it must output 12 to 24 VDC. Note
that encoders with 5V sourcing outputs will not work with DL05 inputs.
Encoder Input Wiring
+
–
12 – 24 VDC
Phase A
Phase B
Encoder
Signal Common
The DL05’s DC inputs are flexible in that they detect current flow in either direction,
so they can be wired to an encoder with either sourcing or sinking outputs. In the
following circuit, an encoder has open-collector NPN transistor outputs. It sinks
current from the PLC input point, which sources current. The power supply can be
the +24VDC auxiliary supply or another supply (+12VDC or +24VDC), as long as the
input specifications are met.
Encoder Output,
(one phase)
+–
Phase A or B Input
Output
Ground
Input
Common
12Ć24 VDC Supply
(sinking)
(sourcing)
In the next circuit, an encoder has open-emitter PNP transistor outputs. It sources
current to the PLC input point, which sinks the current back to ground. Since the
encoder sources current, no additional power supply is required. However, note that
the encoder output must be 12 to 24 volts (5V encoder outputs will not work).
Phase A or B Input
Output (sourcing)
Ground
Input
Common
+12 to 24VDC
(sinking)
Encoder Output,
(one phase)
Wiring Diagram
Interfacing to
Encoder Outputs
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