Specifications

DL05 Micro PLC User Manual, 6th Edition, Rev. C

E–7

Appendix E: High-speed Input and Pulse Output Features

Wiring Diagram

A general wiring diagram for counters/encoders to the DL05 in HSIO Mode 10 is shown

below. Many types of pulse-generating devices may be used, such as proximity switches,

single-channel encoders, magnetic or optical sensors, etc. Devices with sinking outputs (NPN

open collector) are probably the best choice for interfacing. If the counter sources to the

inputs, it must output 12 to 24 VDC. Note that devices with 5V sourcing outputs will not

work with DL05 inputs.

Interfacing to Counter Inputs

Interfacing to Counter Outputs

The DL05’s DC inputs are flexible in that they detect current flow in either direction, so they

can be wired to a counter with either sourcing or sinking outputs. In the following circuit, a

counter has open-collector NPN transistor outputs. It sinks current from the PLC input

point, which sources current. The power supply can be the FA–24PS or another supply

(+12VDC or +24VDC), as long as the input specifications are met.

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).

Counter Input Wiring

Signal Common

Signal

+–

Counter Output

+–

X0 Input

Output

Ground

Input

Common

12-24 VDC Supply

(sinking)

(sourcing)