Specifications

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

E–3

Appendix E: High-speed Input and Pulse Output Features

Dedicated High- Speed I/O Circuit

The internal CPU’s main task is to execute the ladder program and read/write all I/O points

during each scan. In order to service high-speed I/O events, the DL05 includes a special

circuit which is dedicated to a portion of the I/O points. Refer to the DL05 block diagram in

the figure below.

The high-speed I/O circuit (HSIO) is dedicated to the first three inputs (X0 – X2) and the

first two outputs (Y0 – Y1). We might think of this as a “CPU helper”. In the default

operation (called “Mode 60”) the HSIO circuit just passes through the I/O signals to or from

the CPU, so that all eight inputs behave equally and all six outputs behave equally. When the

CPU is configured in any other HSIO Mode, the HSIO circuit imposes a specialized

function on the portion of inputs and outputs shown. The HSIO circuit operates

independently of the CPU program scan. This provides accurate measurement and capturing of

high-speed I/O activity while the CPU is busy with ladder program execution.

Wiring Diagrams for Each HSIO Mode

After choosing the appropriate HSIO mode for your application, you’ll need to refer to the

section in this chapter for that specific mode. Each section includes wiring diagram(s) to help

you connect the High-Speed I/O points correctly to field devices. An example of the

quadrature counter mode diagram is shown below.

Output Circuit

Input Circuit

CPU

8 Discrete Inputs

Discrete Outputs

PLC

DL05

High-Speed

I/O Circuit

X0 - X2

Y0, Y1

X3 -X7

Y2 - Y5

Encoder Input Wiring

–

12 – 24 VDC

Phase A

Phase B

Encoder

Signal Common