I guess it to be Side Mounted Magazine with a Tool Change Arm. Tools are behind a door. one arm picks up one by one and bring it to the spindle.

The indicator flashes orange when call tool. I do not see the alarm number. the machine stops.

I have a paper copy of the ladder diagram. It takes a lot of work to get it readable image attached here.
Would it help?

It is possible that I have broken something when I changed the data transmission ic.