Specifications

The next figure shows how the HSIO counter will appear in a ladder program. Note that the

Enable Interrupt (ENI) command must execute before the counter value reaches the first

preset value. We do this at powerup by using the first scan relay. When using the counter but

not the presets and interrupt, we can omit the ENI.

When the enable input is energized, the high-speed counter will respond to pulses on X0 and

increment the counter at CT76 – CT77. The reset input contact behaves in a logical OR

fashion with the physical reset input X2 (when selected). So, the high speed counter can

receive a reset from either the contact(s) on the reset rung in the ladder, OR the external reset

X2 if you have configured X2 as an external reset.

Program Example: Counter Without Preset

The following example is the simplest way to use the high-speed counter, which does not use

the presets and special relays in the interrupt routine. The program configures the HSIO

circuit for Mode 10 operation, so X0 is automatically the counter clock input. It uses the

Compare-double (CMPD) instruction to cause action at certain count values. Note that this

allows you to have more than 24 “presets”. Then it configures X2 to be the external reset of

the counter.

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

E–12

Appendix E: High-speed Input and Pulse Output Features

Direct SOFT32

Required

Preset Range:

1-99999999

Reset Input

UDC

CT76

Kxxxxxxxx

Enable Input

Dummy Input

ENI

SP1

DirectSOFT