EBRO ARMATUREN SBU Original Assembly Instructions With Operating Instructions And Technical Appendix page 30

Operating instructions - SBU IO-Link
The operating company must therefore ensure that the SBU IO-Link and the pipework or quarter turn
actuator are earthed via a secure earth connection to an earthing point. This particularly applies where
insulating seals and screw connections made of non-conductive materials are used.
The bleeder resistance must be  10 
6
The operating company must ensure that the SBU IO-Link is connected via an electrostatically conductive
pipe connection or via a separate earthing point.
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