Hi, all.

I have a different application that I can't seem to figure out.

Basically, I have a set of anti-tie down handles.  When you have both hands on it, it activates the relay input of the PLC.  I basically want to do something like:

If held down for 15 seconds, then activate a coil or output, or something.

Not sure how I can time an "if" statement if it's been held or activated for a period of time.

Sounds like a On Delay Timer

BR. Sven

Thanks!  Work beautifully.

Now, I have a weirder question.  I've experienced this with both the TON and TONR timer -- when I store a value for ET -- it updates my timer?  I basically want to monitor that when the 15 seconds are over, it does something else.  Although it seems to update (restart) when I store a value for ET.

Alternatively, it does the same thing with TONR.  I made a two minute timer, and when it's done -- it sets a few relay outputs.  Works great.  When I add in a value for ET -- it seems like my relay outputs reset on some clock frequency?

SMJE

Sounds like a On Delay Timer

BR. Sven

SagarDPatel

Now, I have a weirder question.  I've experienced this with both the TON and TONR timer -- when I store a value for ET -- it updates my timer?  I basically want to monitor that when the 15 seconds are over, it does something else.  Although it seems to update (restart) when I store a value for ET.y?

 Hello,

You may use a comparator in your logic with the current timer time.

Add a second timer if needed.

Best regards,

Hugo

How do I compare the current time of the TONR or TON timer?  Especially if my ET seems to reset my Q output?

HugoD

 

SagarDPatel

Now, I have a weirder question.  I've experienced this with both the TON and TONR timer -- when I store a value for ET -- it updates my timer?  I basically want to monitor that when the 15 seconds are over, it does something else.  Although it seems to update (restart) when I store a value for ET.y?

 Hello,

You may use a comparator in your logic with the current timer time.

Add a second timer if needed.

Best regards,

Hugo

Hi SagarDPatel,

I can't say I really understand what you mean by "when I store a value for ET -- it updates my timer?"

ET is the elapsed time of the timer while its input is active. With TON when your IN = true it will start incrementing up to defined preset time PT and it will set the timer output TRUE. As soon as your input goes false the value of ET is set back to 0. TONR is retentive timer and when the input is active ET keeps increasing to PT but when the IN will change the state to 0 the ET will stop incrementing but its value will be stored so next time the timer is enabled it will only need to be set for PT-ET to have the output = 1.
Look at the timing diagrams in TIA manual for clear visual description.

As for the second question"How do I compare the current time of the TONR or TON timer?  Especially if my ET seems to reset my Q output?" - ET does not reset  your output it is the removal of input.

For comparison simply wire the variable to both timers ET output and use comparator to check them if your comparison is true, see attached graphic.
Second network is comparing when TON time is greater then 10s and TON with TONR (TONR is not visible on the graphic).

Regards,
Pav_