Hardware
Copyright IXXAT Automation GmbH
167
IEM Manual, 1.5
7.1.4 PE and shielding recommendations
To ensure proper EMC behavior, the IEM shall be mounted properly on the
three mounting holes. One of the mounting holes is responsible for connecting
the shield of the R45 connections to PE according to the recommendation of
each specific industrial Ethernet flavor. The application PCB must in any case
provide PE connection via this specific mounting hole.
Top side
Bottom side
Earth (PE)
RJ45
shields
washers
Figure 7-10: Shield connector overview
To comply with the protocol recommendation we recommend following table
Bus protocol
RJ45 shields
earth (PE)
PROFINET
Low resistance to earth (PE) non-
isolated washer
Low resistance to earth - non-
isolated washer
EtherCAT
High resistance between the RJ45
shields - isolated washer
Low resistance to earth
–
non-isolated washer
Powerlink
x
x
Ethernet/IP
x
x
x = don’t care
Figure 7-11: Shielding behavior of the different bus protocols
7.2
Hardware interface
Note:
For activating the different access mode be sure that you use the
reset condition from chapter 7.1.1.2.8.1.