Hi, 

I am new in programming with TIA.

I am using TIA 15.1 and my TON Timer doesn't work. Time elapsed in the timer but the output doesn't change to 1. Something strange about that, the output from the Timer change to 1 but just sometimes one Time in 1-2 minutes.TOFF works fine! I don't really understand that.

The idea of the program is: 

I want to start a pump with 5 sec ON then 5 sec OFF (just for example)

and the PT has to be set able on a HMI 

Hope I can find some help here.

attached a screenshot of the network

Hello,

The "problem" is when your TON.Q is TRUE then your input of TON is FALSE.

Your output of the TON is only for one OB1-cycle TRUE.
You can't see this with a online connection maximum randomly.

I don't know which PLC do you use, but if you use a S7-1X00 then you can use the LGF (library of general functions) There you can use the function LGF_Frequency.

regards
CaOd

Thank you for responding!

I work with a s7-1200 so I found the LGF_Frequency but I don't know which parameter i have to set to get this kind of result..

Can i do with the LGF_Frequency also 5min ON, 25 min OFF?

sorry if that is a stupid question but i am really new in programming...

 I would suggest you to go for 2 timers configuration as its easy way of doing as you are at the learning stage.

Starting with the request to to start the timer (TON - 5min as PT say it as PumpOnTimer)  and as soon as the timer is done with that done bit run another (TON - 25 min as PT say it as PumpOFFTimer) and use the NC contact of PumpOFFTimer in between the request to start and the PumpOnTimer. I think this will solve your purpose

For your code should look something like follows

---|  |---| / |----[TON1]---[TON2]---

M6.1 - is the first NO contact

TON2.Q is the 2nd NC contact

TON1 will be your Pump on timer

TON2 Will be your Pump Off timer

Use the just TON1.Q (NO contact) to drive the Pump coil.

Hope this helps

Nothing  is stupid whenever you are at your learning phase, rather its curiosity that would help you grow your knowledge. Would quote something below for you

"The more you sweat in training, the less you bleed in battle"

You can use the F1/help doc to understand the basic operation of the Siemens block.

if got trouble feel free to write back.

a.cristu

Thank you for responding!

I work with a s7-1200 so I found the LGF_Frequency but I don't know which parameter i have to set to get this kind of result..

Can i do with the LGF_Frequency also 5min ON, 25 min OFF?

sorry if that is a stupid question but i am really new in programming...

Hei Smit Shah!,

thank you for the encouragement!

If I put a Q Timer in front of a Timer all Timers in my program gone crazy.

Instead of counting the value from DB3 TImer (30seconds), the program is counting the value of DB1 TIMER.

Any idea?

There a screenshot from the problem attached.

 I guess I missed something important

See the attachment

SMIT SHAH

 I would suggest you to go for 2 timers configuration as its easy way of doing as you are at the learning stage.

Starting with the request to to start the timer (TON - 5min as PT say it as PumpOnTimer)  and as soon as the timer is done with that done bit run another (TON - 25 min as PT say it as PumpOFFTimer) and use the NC contact of PumpOFFTimer in between the request to start and the PumpOnTimer. I think this will solve your purpose

For your code should look something like follows

---|  |---| / |----[TON1]---[TON2]---

M6.1 - is the first NO contact

TON2.Q is the 2nd NC contact

TON1 will be your Pump on timer

TON2 Will be your Pump Off timer

Use the just TON1.Q (NO contact) to drive the Pump coil.

Hope this helps

Nothing  is stupid whenever you are at your learning phase, rather its curiosity that would help you grow your knowledge. Would quote something below for you

"The more you sweat in training, the less you bleed in battle"

You can use the F1/help doc to understand the basic operation of the Siemens block.

if got trouble feel free to write back.

a.cristu

Thank you for responding!

I work with a s7-1200 so I found the LGF_Frequency but I don't know which parameter i have to set to get this kind of result..

Can i do with the LGF_Frequency also 5min ON, 25 min OFF?

sorry if that is a stupid question but i am really new in programming...

 

Dear Experts,

1. I have 2 pumps which I have to start sequentially with maximal 30 min operation time for each pump if 30 min elapsed fromP1, P2 has to start . ( In programm %Q0.2 goes ON 20 seconds and %Q0.3 10 seconds)

2. If protection failed from the first pump second pump has to start without max 30min operation time and vice versa.

3. If Pump 1 starts in the program but the status signal from Pump 1 not goes 1, Pump 2 has to start with a 6seconds ON delay but without max 30min operation time and vice versa.

network 2:  i compare Output %Q0.2 with the On Status %I0.6  from the pump (%I0.6 which have to be 1 if PUMP is 1) I put an ON delay to break the contact %Q0.2  and to start %Q0.3

same for PUMP 2

Network 3: condition to start sequential timer for pumps

Network 4-Start Timer

Network 5:  Start PUMP 1 and Pump 2

attached screenshots from the program and i took a screenshot from cross reference DB3, if i click on the DB3 in the network it has not the same cross reference like in the system block.

could be that the problem?

Hi,

If In of TON_TIMER is permanent true then timer will never start.

Possible Solution:

Activate the System memory bits from the properties of the cpu and then use "First cycle" bit as normally closed before merker. In this way, after second cycle, In of TON will be 0 to 1 and condition of TON_TIMER would be fulfilled.