Kuka safety setup

IF KRC4 is using X11 as safety interface then wiring has to follow KUKA documentation. an example of X11 circuits (only the safety inputs) can be found in Forum Download section.

X11 interface does not care if connected external circuit is using relay contact or push button contacts or any other type of contacts - they are just contacts that need to form closed circuit. they are so called "potential-free" or "dry contacts" with low voltage drop. and of course they need to belong to some safet rated component.

What would the acknowledgement do? The external e-stop signal on X11 does not require acknowledgement as far as I can remember. Are you referring to enclosure interlocks such as a safety gate, ect?

Yes. That's why it's called "Acknowledge Operator Safety."

Whether this input is required or not can be configured from within the WorkVisual project.

manual acknowledgment of operator safety is required.... the question if just if it is done at the robot input (X11) or externally .

normally this is done externally except in simplest cell setup where no external safety controller is used.

User safety acknowledgement is a required function. If this is done on some external unit, you do need to acknowledge again on the robot. If there is no external safety controller present, or when it us present but acknowledgement is not done on that unit, acknowledgement must be done on KRC. KRC has safety configuration setting where one can specify this.

All of the inputs on the KRC4 SIB are "pulse coded", so I believe you will need to use safety relays in between your safety controllers outputs and the SIB inputs.

The KRC4 manual covers this in-depth, I would suggest reading it to understand the requirements or hiring an integrator that has experience working with safety systems.