I don’t think that is a matter of tool compensation, because the program is something like that:

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N4 G0 X100 Y 200
N 5 T=”MILL 50”

N6 M06

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N 100 T=”Drill 20”

N105 M06

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N 200 M02

At first tool change, everything is OK. At the second tool change, (because they rerun the program the magazine is not moving) the pointer on the screen passes over N100 and stops at N105 with “Waiting for TC acknowledgment”. In the PLC I’ve checked and it’s seems that both signals for prepare change and perform change (DB72.DBX 4.2 and DB72.DBX4.1) is coming at the same time. I checked the PLC acknowledgment for tool preparation and it’s OK, but I think that the NC wait another kind of acknowledgment since it sanded both signals. More, in the tool change cycle in the NC, I have more movement commands before the effective tool change but they are not executed because the NC stops before M06. Is the very first time when I encountered this kind of problem since the machine is running and they made many other programs on the machine and everything was OK.

By the way: I put a T0 and M06 before N5 and the tool change was performed afterwards.

Anyway thank you for your replay

Nit

It's not clear from the sample whether the M6 calls a subroutine or not.  If there is still a D word active, block execution will stop at the M6 until the tool acknowledgement.  Since it works with T0, which has no active D word, that seems like it might be related.

Even with a D0 programmed in the M6 subroutine, you have to set the MD parameter for cutting edge default to -2 for it to work.

SteveA

Yesterday, I managed to dig up dipper. First of all I want to tell you that the tool change is made partially in the NC (M06 call a subroutine in which I made all the necessary movements: spindle positioning, movement on Y and Z axis necessary for tool change when spindle is the change position DB72, loop for Block search active…) and partially in the PLC (magazine movement, effective tool change, movements necessary for tool change for the magazine  as change position DB71 and acknowledgements). I tried to change MD20700 first in 0, but the result was even worse. The tool change wasn’t completed and still the machine continuing the movement in the program. After that I changed MD 20700 in -2 but no result. After a wile I understood what it’s happening. When the NC call the M06 subroutine, due to D0 it call a REPOSA subroutine and in the same time generate a Block search command (???)  (only in NC) which bypass the normal tool change from the subroutine, and reach in a point in which due to the fact that the spindle is still rotating (M5 and SPOSA was bypassed), the PLC program stop. So I think that now I must program in the PLC the same movements as in subroutine (partially  I done for the manually load/unload command).

Anyway I think that now I can solve the problem, and I want to thank you for your ideas.

Nit