Change register in ladder

[fomaz]

In a fanuc 21-TB, I need to have DNC operation.
We do small series of pieces and it is not friendly to load the program with a card (card slot is on the electrical pannel), or to edit manualy the programs.

We issue is that no tape mode button is present on the control.

Looking at the ladder, it seams that it was prepared to have the DNC operation since I have a line that makes it on/off. Also an RS232 port is present on the machine. The ladder says:

R9091.0------------------------G0043.5 | DNC OPERATION S ELECT SIGNAL

My consern it to make the R9091.0 register ON. I belive that I must add a button and connect it to a physical input to the controller, but I do not have a clue where that should be done, since the R9091.0 does not match any electrical input on the electrical cabinet.

Any ideia is welcome.

Thank you

[Al_The_Man]

You could search the ladder for occurrences of R909.0, especially if shown as an output, if shown as an output, see what is configured in the logic string, phyisical inputs for e.g.
R909.0 is an internal register storage bit only.
Al.

[Ozemale6t9]

You may have a button/mode that says 'Tape'. Some MTBs still refer to DNC mode as Tape mode.

[fomaz]

You may have a button/mode that says 'Tape'. Some MTBs still refer to DNC mode as Tape mode.

No Tape or DNC button is present on the controller.

Originally Posted by Al_The_Man You could search the ladder for occurrences of R909.0, especially if shown as an output, if shown as an output, see what is configured in the logic string, phyisical inputs for e.g. R909.0 is an internal register storage bit only. Al.

I belive that you meant R9091.0, correct?
It does not appear on the coil side on all the ladder.

I will probably try to do the following:

R9091.0------------------------G0043.5 | DNC OPERATION SELECT SIGNAL

X(one that I know)----|

Basically I will do an OR for the G0043.5


Could this be dangerous? I cannot mess up, since I do not have the means to make it right again ($)
Thank you for any comment.

[Al_The_Man]

What I would say to do is at minimum, put the X.xxx input as a N.O. contact with R9091.0 as the output 'coil' all on a separate rung.
Al.

[fomaz]

Editing the ladder made it work usind X1000.4 that was unused.
Thank you for the support.