Inverted Input signal

Hi,

i am working with KRC4 KSS8.6.6

Is it possible to invert "physical" value of input signal $IN[]?

What i need?

I have robot without PLC, so i need to set correct signals for ext aut.

On operator panel i have key - service mode on(1)/off(0)

I would like to map system input SIGNAL $I_O_ACT to service key, but i need inverted value of input signal, so it is active when service mode is off.

Broader question:

Is it possible to use logic for system inputs? For example $EXT_START = ((bool1 and bool2) or $IN[3]), something like ABB crossconections.

I tried to use FLAG or BOOL, but it makes STEU\MADA\$machine.dat file inconsistent and put system in error.

Otherwise, writing directly to system inputs is not possible as it is write protected.

Thanks

Thank you,

we will change type of service key to normaly closed.

But still, it is pity that is not possible to create logic for system inputs.