I want to implement a certain sequential circuit on a PLC. As far as I know we first need to Update the states, delete the previous states and finally set the outputs based on the state. How is this done for Siemens? Something doesn't want to work for me. I'm trying to do as in the screenshot,...

This way it will definitely not work. I'm not familiar with the Logo program, try doing it on the L and U coils. That is, for example, there is no I1 and there is no I2 then L on the M1 bit. I1 is gone but M1 is there, it's L M2 and U M1. I don't know how to write it more precisely, if you write something more it will be easier. Anyway, if you write the program this way it has a chance to work.

Instead of M1, M2... you need to use latching relays - they will remember the state even though the signal on their input (set) will change during. When writing the programme, you will have to remember to give the signal (reset) at the right place. Another method is: after controlling e.g. M1, in the next line add a condition supporting coil M1 (with some NC contact from Mx, which will cancel supporting M1)

I am trying with RS flip-flops. I want to erase SF001 when we go to state two, but then I see a message like in the attached picture. There is a sequential circuit described a little differently on this page. The markers used are. I want to implement a similar automaton as in the pdf.

This connection is possible via an output e.g. M1 ...such is the charm of LOGO (not necessarily logically)

Thanks. Now it's working, I wouldn't have come across it myself. How does the Tia portal relate to the soft comfort logo?

Like the Mercedes SE to the Fiat 126p

Welcome, Siemens' LOGO! is not a PLC, but only a programmable relay.... Greetings.

[Siemens] How to implement a sequential circuit on a PLC?

shy_moon 4215 7

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#1 15965101 30 Sep 2016 22:21

shy_moon shy_moon

Level 8

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Post #1
15965101 30 Sep 2016 22:21

I want to implement a certain sequential circuit on a PLC. As far as I know we first need to Update the states, delete the previous states and finally set the outputs based on the state. How is this done for Siemens? Something doesn't want to work for me.
I'm trying to do as in the screenshot, but the markers don't want to remember the states.
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#2 15965698 01 Oct 2016 13:10

and_rog and_rog

Level 23

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Post #2
15965698 01 Oct 2016 13:10

This way it will definitely not work. I'm not familiar with the Logo program, try doing it on the "L" and "U" coils. That is, for example, there is no I1 and there is no I2 then "L" on the M1 bit. I1 is gone but M1 is there, it's "L" M2 and "U" M1. I don't know how to write it more precisely, if you write something more it will be easier. Anyway, if you write the program this way it has a chance to work.
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#3 15966029 01 Oct 2016 16:48

pafciowaw pafciowaw

Automation specialist

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Post #3
15966029 01 Oct 2016 16:48

Instead of M1, M2... you need to use "latching relays" - they will remember the state even though the signal on their input (set) will change "during". When writing the programme, you will have to remember to give the signal (reset) at the right place.
Another method is: after controlling e.g. M1, in the next line add a condition supporting coil M1 (with some NC contact from Mx, which will cancel supporting M1)
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#4 15966234 01 Oct 2016 18:41

shy_moon shy_moon

Level 8

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Post #4
15966234 01 Oct 2016 18:41

I am trying with RS flip-flops. I want to erase SF001 when we go to state two, but then I see a message like in the attached picture.
There is a sequential circuit described a little differently on this page. The markers used are.
http://etacar.put.poznan.pl/marcin.kielczewski/ZSP05.pdf
I want to implement a similar automaton as in the pdf.
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#5 15966349 01 Oct 2016 19:41

pafciowaw pafciowaw

Automation specialist

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Post #5
15966349 01 Oct 2016 19:41

This connection is possible via an "output" e.g. M1

...such is the charm of LOGO (not necessarily logically)
#6 15966734 01 Oct 2016 22:38

shy_moon shy_moon

Level 8

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Post #6
15966734 01 Oct 2016 22:38

Thanks. Now it's working, I wouldn't have come across it myself. How does the Tia portal relate to the soft comfort logo?
#7 15967710 02 Oct 2016 14:29

and_rog and_rog

Level 23

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Post #7
15967710 02 Oct 2016 14:29

Like the Mercedes SE to the Fiat 126p
#8 16282302 16 Feb 2017 03:44

bhtom bhtom

Level 39

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Post #8
16282302 16 Feb 2017 03:44

Welcome,

shy_moon wrote:
I am looking to implement some sequencing circuitry on a PLC.

Siemens' LOGO! is not a PLC, but only a programmable relay....

Greetings.
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