signal bb1 maho GR400 C

Hello everyone,
I am new here, I have a lathe cnc maho GR400 C, when I press the start button to start the hydraulic, an error is displayed on the screen (E07) which means from the manual (missing signal Bb1).
I hope you can help me.
thank you in advance.

Unless your Maho has been retrofitted to Linuxcnc we are not going to be much help. Maybe try asking on a more Maho specific site.