The sensor blocks are assembled on the mounting bracket on the moving end side and continuously measure the push/pull forces there.
These measured values are transmitted via a cable to a top-hat rail module in the control cabinet.
If predefined limit values are exceeded, the system is switched off.

The dummy blocks are the dimensionally identical counterparts to the sensor blocks and have a mechanical equalising function.
They are required in order to be able to mount the moving arm on the mounting bracket.