Momentary Pushbutton Control on/on

[akalawolf]

Sorry if this has been beat to death.

I have an old Samsung SPC-10 that I want to use for a gate control.

When a momentary push-button contact is made I need it to engage relay 1(Gate Close)push the button again and
it switches to relay 2(Gate Open)

I have the time delays and limits switches worked out.

I have looked at and tried several flip/flop diagrams and can not get them to work, only half works or the relays buzz(scan problem?)

 

[OZEE]

Post your logic and perhaps we can see what's wrong.

 

[akalawolf]

Got this from a diagram, out R015.02 only holds if the NO button(R000.01) is held in

as far as I can find the PLC does not support one shot or DIFU / KEEP

 

[Steve Bailey]

If your PLC doesn't have a one-shot (DIFU) function, here's how to make one

Trigger  Hold    One-Shot

--] [-----]/[------( )-

 

 

Trigger           Hold

--] [--------------( )-

 

[milldrone]

akalawolf,

Try this.

 

[akalawolf]

reply to-Steve Bailey

Sorry that went over my head, I can not find any one-shot in the program.

The software is WinGPC 3.80

 

[akalawolf]

akalawolf,

Try this.

same results R015.03 is not holding after the button is released

 

[Steve Bailey]

Trigger", "Hold", and "One-Shot" are names I assigned. It is left up to you to choose appropriate addresses for them. For example, "Trigger" might be the real world input address for your pushbutton. The addresses assigned to "Hold" and "One-Shot" can be any available internal (M) addresses or bits of R words.

Edit
Sorry about the reference to M addresses. I don't know the Samsung addressing scheme so I'm not sure if they even have a separate range of discrete nternals or whether you always use bits of R words.

 

[akalawolf]

Trigger", "Hold", and "One-Shot" are names I assigned. It is left up to you to choose appropriate addresses for them. For example, "Trigger" might be the real world input address for your pushbutton. The addresses assigned to "Hold" and "One-Shot" can be any available internal (M) addresses or bits of R words.

Edit
Sorry about the reference to M addresses. I don't know the Samsung addressing scheme so I'm not sure if they even have a separate range of discrete nternals or whether you always use bits of R words.

Ok it does have M and K
Internal Relay (non-retentive) MOO000-MO3115
Keep Relay (retentive) KOOOOO-KO1515

This is also know as a Cutler Hammer D50

 

[Christoff84]

Might want to try the logic in this post

http://www.plctalk.net/qanda/showpost.php?p=98712&postcount=10

 

[milldrone]

Got this from a diagram, out R015.02 only holds if the NO button(R000.01) is held in

same results R015.03 is not holding after the button is released

I would expect R015.03 to be momentary. Or is the above comment a typo?

Any chance of contact bounce? Can you "force" bits? And then test your flip flop with a forced bit as the input?

If all else fails have you tried using a counter, and using the least significant bit of the accumulated count as off or on?

 

[PeterW]

 

[akalawolf]

M1.2
(p)
what is this?

 

[STL???]

(P) is Siemen's S7 PLC rising edge(oneshot)instruction.
M1.2 stores the state.

Network 2 is basically exclusive Or logic which will toggle the output state (m1.0) each time the button is pressed (I0.0)

 

[Lancie1]

There are 10 methods to toggle an output, posted as a PDF file in the "Downloads" section:

http://www.plcs.net/downloads/index...ey&PHPSESSID=a6288c3552128cfe2cc6a97be23ca82e