quick mitsubishi plc instruction question

[ganutenator]

I apologize for not having the model of the plc. I am trying to get it.

I have a print out of the program and it seems straight fwd.

One instruction however has an encoder input.

The instruction is [SPD X000 K100 DO]
parallel branch output [MUL DO K10 D4]

And it has a normally open contact w/ address M8000

I didn't see M8000 anywhere else in the program, so I wonder if it is an interrupt or some other special instruction address.

Any help will be appreciated.

Thanks in advance.

 

[ganutenator]

Mitsubishi
FX3g-60M

 

[mechtec]

M8000 in Mitsubishi FX is always on.

 

[ganutenator]

thanks

 

[ganutenator]

I was about to comment wtf, that is stupid.
Then I realized that I could NOT the instruction and then it would be an Allen Bradley AFI instruction, and I loved the afi instruction.

 

[mechtec]

Simply program M8000 as a NC contact will give you the AFI equivalent. I generally pick an unused memory coil, usually M3000 to use to enable or disable rungs. When the program is complete and working, do a search for that contact and remove it.

 

[nehpets]

Or use M8001 (always off) instruction, the manual gives all the M8XXX and D8XXX functions and descriptions.

Steve

 

[ganutenator]

can't seem to find the manual. anybody know what the 'spd' function is?

 

[BTalbot]

It calculates the "speed" of pulses on input X0

It will count pulses of X0 over the time period (in your case 100ms K100)
and moves that value into register D0

 

[Paullys50]

Manual

Says "SPD" is for speed detection for use with one of the inputs that can detect high speed pulses. GX Works help file say anything?

 

[ganutenator]

thank you thank you thank you.
This case is now closed.
Mitsubishi wouldn't help me because I don't have a support contract.
You guys Rock!

 

[dploof23]

thank you thank you thank you.
This case is now closed.
Mitsubishi wouldn't help me because I don't have a support contract.
You guys Rock!

Just FYI, you only would have needed a support contract if it was after hours or on a weekend. Mitsu offers free tech support mon-fri and the support is top notch.

Dave

 

[Ronnie Sullivan]

I second that here in the UK.

They have even come out to site at no charge to help me out.
(I'm not saying they didn't want to stretch their legs - or get out of the office)
They helped me with a servo control problem.