omron vs mitsubishi

sutton · Jul 7, 2004

hi all,

I used mitsubishi plc for one year before. now im using omron and not quite familiar with it.

can anyone tell me how to apply Mitsubishi's 'alternate function ALT' as in Omron software? i look into the manual book but couldn't find this function.

please help. thank you.

Jay Anthony · Jul 7, 2004

I have looked through several Mitsuibishi programming manuals for "ALT". I cannot find any mention of this instruction. Which model PLC uses this function? Can you describe it's operation?

panic mode · Jul 7, 2004

ALT instruction is used only in small PLCs (FX) and it
toggles the output bit every time condition is true.
I think the closest Omron equivalent would be KEEP instruction .

Jay Anthony · Jul 7, 2004

Thank you, panic mode:

LD 0.00
DIFU 200.00

LD 200.00
AND NOT 10.00
LD 200.00
AND 10.00
KEEP 10.00

Should also work in Mitsuibishi.

sutton · Jul 11, 2004

HI Jay Anthony,

thanks again. well, there is no KEEP function in Mitsubishi PLC. And there is also no ALT function in the bigger PLC series. How should I work out this Alternate function in it?

thank you for your help. cheers,

sutton

Goody · Jul 12, 2004

Search this site for 'flip flop'

ALT is a self contained flip-flop instruction

Jay Anthony · Jul 12, 2004

LD 0.00
DIFU 200.00

LD 200.00
AND NOT 10.00
SET 10.00
LD 200.00
AND 10.00
RESET 10.00

I'm having a hard time believing that there is no latching function in a Mitsuibishi instruction set.

chavak · Jul 12, 2004

Hi Jay,

There is also Set/Rset function in Mitsubishi, apart from that there is an Alt function there - my experience is limited to FX series (of course in old Medoc days, never used GPP)

I guess the developers gave an Alt function to create easier flip-flop deployment.

Never seen this function in Omron or AB

Tom Jenkins · Jul 12, 2004

I personally hate "Set" and "Reset" functions because they can cause debugging difficulties. At 11:59 PM it can become very difficult to remember why that particular contact is "On". I try to use the flip flop or holding contacts or anything else where the action is self evident while I'm debugging. I use set/reset, but only if there isn't any other reasonable way.

Jay Anthony · Jul 12, 2004

but only if there isn't any other reasonable way.

Thus the suggestion for SET/RSET...

OK, Suggestion #3....

LD 0.00
DIFU 200.00

LD 200.00
AND NOT 10.00
LD 200.00
AND 10.00
OR LD
OUT 10.00

sutton · Jul 12, 2004

Thanks everyone,

Jay, i did tried out that ladder logic earlier on using SET/ RESET. I run the simulation mode but it will not work. In this ladder logic, it will always be a RESET state instead of flip flop 10.00.
Is there any other idea? How to create a flip-flop state in Mitsubitshi? thank you.

LD 0.00
DIFU 200.00

LD 200.00
AND NOT 10.00
SET 10.00
LD 200.00
AND 10.00
RESET 10.00

Jay Anthony · Jul 12, 2004

I used mitsubishi plc for one year before. now im using omron and not quite familiar with it.

Is there any other idea? How to create a flip-flop state in Mitsubitshi? thank you.

Make up your mind on whether you need Mitsubishi help or Omron help. I'm sure panic mode can help you out on Mitsubishi.

My feeling is that you did not use the differentiated form of 200.00 or you have a coil of either 200.00 or 10.00 somewhere else in your program.
Can you post a screenshot of your ladder?

sutton · Jul 13, 2004

Jay,

Well, I am sorry to confuse you. I was actually looking for Flip-flop function help in Omron, which you already solved for me. I was only curious when you say this.

Should also work in Mitsuibishi.

So I tried out the ladder in Mitsubishi PLC software but it wont work. I did use ALT function in the smaller PLC - FX series. but I just wonder how to do the similiar keep function in other Mitsubishi PLC series.

If im not wrong, there is no DIFU function in Mitsubishi. So i use Pulse Up function. Then i used SET and RESET as a latching function.

Here, I had attached a ladder diagram. I found that Y001 is always ON everytime you switch X000 On and Off.

Thank you for your help. cheers.

sutton · Jul 13, 2004

Oops, here is the screenshot of ladder diagram.

Thanks.

Jay Anthony · Jul 13, 2004

You are right. I concede. It wouldn't have worked in Omron either. You need a KEEP instruction.

omron vs mitsubishi

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