turck BL20 - Protecting the Service Interface on the Gateway

Guidelines for Station Planning
D301087 0308 - BL20 CANopen6-12
When using a digital input module for 120/230 V AC, it should be
ensured that a potential group is created in conjunction with the
Power Feeding module BL20-PF-120/230VAC-D.
Protecting the Service Interface on the Gateway
During operation, the cover protecting the service interface and the
rotary coding-switches must remain closed due to EMC and ESD.
Attention
It is not permitted to use the modules with 24 V DC and
120/230 V AC field supply in a joint potential group.