EBRO ARMATUREN SBU Original Assembly Instructions With Operating Instructions And Technical Appendix page 42

Operating instructions - SBU IO-Link
NOTE
Switch the SBU IO-Link off and secure it against being switched on again with
a lock!
Switch the electrical components and the SBU IO-Link off and secure them
against being switched on again for all work, before service, during adjustment
and maintenance.
See chapter A11 on maintenance!
Page 42 of 50