Continuing from the previous two articles, this article mainly explains how to connect he On-Delay Timer. 

1. Overall working principle 

When the signal at the input end is 1, the timer starts to time according to the set value, nd the timing time is 1 at the output terminal, and the output continues until the input ignal turns to 0. Stop the output when reset. 

What it looks like in ladder chart programming: 

Turn on the On-Delay Timer 

In the above figure, the S end is the signal input terminal; The TV side is the preset value input side, which is the timing time you want to set, and IOS is set here; The R end is the reset end; Bl and BCD are output to display the current time value, the display value type is different, Bl is a hexadecimal format without a time reference, and BCD is S5T# format. 

2. PLC programming examples and timing diagram explanations 

Application in PLC programming

 In the above figure, 10.1 is the start button, used to control the signal interruption, when it is pressed, the IOS timing starts to start the timing as shown in Figure 3 below, the timing time is up to the signal output (QO.O gets the signal), the 10.1 input signal stops and the output on the Q side is also stopped; whether within or outside IOS, as long as the input terminal changes from 1 to 0, it will no longer continue to output as shown in Figure 4 below. When the 10.1 reset button (when pressed, the timer output is 0, the signal output stops) is shown in Figure 5 below. 

The timing time to the output is 1

Stop the output when there is no signal at the input

Stop the output when reset

PLC corresponding action timing diagram

The above is the corresponding timing schematic. In order to help friends deepen their impression, here is also a small question for everyone to think about: when the start button is released, the timer is halfway (5s), when the start button is pressed again, does the timer start from the beginning (IOS) or from the half (5s)? 

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