[DougRMC]

I bought a VMC 800 22 with a TNC370 control. It had problems with the toolchanger. I found the cause was a bad output from the control. I edited the PLC to use another output and rewired the relay to it. Now it all works great... except I had to change parameter mp4010 to 1 so i can run the PLC from RAM.

This is the first time Ive used this control, so Im not sure how this part really works. But I've been using this technical manual for the tnc 360 https://www.yumpu.com/en/document/vi...n-dr-johannes- .
It walked me through everything else but it says running the PLC from RAM is only for testing and it should be transferred to eprom when you are done. It says to do that you will need a pc and "MEGA PROMMER software (version 2.12 or later)" . I'm not sure where to find that, I contacted Heidenhain and they say they cant help me.

Anyone know anything about MEGA PROMMER or how to write to the eprom on this control? Or failing that does anyone know what problems running the PLC from RAM might cause? I shut the power off overnight and it remembered my changes so it must have a battery somewhere.

Thanks

[csg67]

This was the MEGA-PROMMER:
https://www.mikrocontroller.net/topic/173010#1657928
Other EPROM programmers can also be used. The PLCdesign program requires the compilation of data. To do this, you must complete a Heidenhain course. https://www.klartext-portal.com/en/t...ca9b0bc87baefe

No problem if running in RAM.
The PLC program and all other data (MPs, etc.) should be saved!
Use the TNCremo (TNCserver) data transfer program. This program is free and can be downloaded from HEIDENHAIN's website.
https://product.heidenhain.de/JPBC/i...Cremo32SP1.zip

"Exchange Buffer Battery
The buffer battery is the voltage source for the
program memory, if the machine tool is switched off.
If the error message
EXCHANGE BUFFER BAlTERY
appears, the batteries must be exchanged within one
week.
The buffer batteries are located behind a screw
fitting in the power supply of the LE.
To exchange, open the LE by undoing both snaps
In order to protect the program memory of the
TNC 370, a capacitor (located on the processor board)
is used in addition to the batteries. Thus, the line
voltage may be switched off during battery exchange,
Without the batteries the capacitor is capable of
maintaining the memory contents for about one day.
The TNC contains an additional accumulator so that
without the batteries the memory contents remains
stored for approx. two weeks.
3 AA-size batteries,
leak-proof
IEC designation “LR6”
NOTE:
The capacitor and the accumulator are only being
charged when the TNC is switched on (charging
time of the accumulator: approx. 24 hi."