Appendices Conducted immunity test A_ A.1.2 Installation Instructions for the EMC Standards interference generated by the PLC. A PLC must be installed in a control box. The control box protects the PLC, and shields off the electromagnetic Control box - Use a conductive control box. - To ensure that an inner plate contacts the control box well, users have to mask the paint on the bolts of the plate. - To ensure that the control box is grounded well even if there is high-frequency noise, users have to connect the control box with a thick wire.
A-3 Environmental phenomenon Fast transient burst High energy surge Radio frequency interference Reference standard IEC 61000-4-4 IEC 61000-4-5 IEC 61000-4-6 Interface/Port Specific Test level Test level Test level interface/port Data communication Shielded cable 1 kV 1 kV CM 10V Unshielded cable 1 kV 1 kV CM 10V Digital and analog I/O AC I/O (unshielded) 2 kV 2 kV CM 1 kV DM 10V Analog or DC I/O (unshielded) 1 kV 1 kV CM 10V All shielded lines (to the earth) 1 kV 1 kV CM 10V Equipment power AC power 2 kV 2 kV CM 1 kV DM 10V DC power 2 kV 0.5 kV CM 0.5 kV DM 10V I/O power and auxiliary power output AC I/O and AC auxiliary power 2 kV 2 kV CM 1 kV DM 10V DC I/O and DC auxiliary power 2 kV 0.5 kV CM 0.5 kV DM 10V