In the case of a ZK2 series product with energy saving function, how can I turn ON the suction command?

Please refer to the following internal circuit and wiring example. In the case of PNP, install a switch between the gray (FUNC) and brown (positive) wires. When the switch is turned ON, a suction command is output, and control takes place automatically.
∗In the case of NPN, install the switch between the gray (FUNC) and blue (negative) wires.