BECKHOFF EL1904 - Manual (Page 26)

Operation
24 EL1904
4.1.4.3 Wiring
Up to eight connections enable the connection of solid or finely stranded cables to the Bus Terminals.
The terminals are implemented in spring force technology. Connect the cables as follows:
1. Open a spring-loaded terminal by slightly pushing with a screwdriver or a rod into the
square opening above the terminal.
2. The wire can now be inserted into the round terminal opening without any force.
3. The terminal closes automatically when the pressure is released, holding the wire safely
and permanently.
Wire cross section 0,08 ... 2.5 mm 2
Strip length 8...9 mm