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Lead Contents

PLC: Program a One-Shot Output

FAQ No. FAQ01479

Primary Contents

Question

How do I program a one-shot output?

Answer

In a one-shot program, as long as the trigger input stays ON for longer than a certain time (see note), the output bit will be turned ON for a specific period of time regardless of how long the trigger input is ON.

Note:Usually this time is equal to the time of a one CPU Unit cycle.

As shown in Figure 1, when the trigger input (CIO 0.00) is ON for either 1.0 s or 2.5 s, the pulse output bit (CIO 2.00) will be turned ON for 1.5 s.

Data Trace Results

Figure 1

CIO 000000: Trigger input bit (CIO 0.00)
CIO 000200: Pulse output bit (CIO 2.00)

Ladder Programming

Programming: CS/CJ-series Programmable Controllers

Program Operation

OFF Operation of Pulse Output Bit (CIO 2.00)

1.If the Trigger Input Bit ON Time Is Less Than the One-shot Time:

The pulse output bit (CIO 2.00) is turned OFF by ---|/|--- T0001 programmed for the self-holding work bit (W0.00).

2.If the Trigger Input Bit ON Time Is Greater Than the One-shot Time:

The pulse output bit (CIO 2.00) is turned OFF by ---|/|--- T0001 programmed on the same rung as the pulse output bit.