PN/PN coupler
Installation and Operating Manual, 06/2010, A5E00717043-04
19
Connecting
3
3.1
Electrical isolation and grounding
3.1.1
Introduction
Redundant 24 V DC power supply
You can connect the PN/PN coupler to two independent 24 V DC power supplies. Only one
24 V DC power supply is ever active at any one time. If one power supply fails, the other
automatically becomes active. During parameterization, you identify which power supplies
(PS1, PS2 or both) are connected and are to be diagnosed. You need only connect up one
24 V DC power supply to operate the PN/PN coupler.
Properties of the PN/PN coupler
●
Both PROFINET IO subnets are electrically isolated from one another.
●
Both PROFINET IO subnets are electrically isolated from the 24 V DC power supply.
●
Both 24 V DC power supplies are electrically isolated from one another.
●
The PROFINET IO subnet to X1 and the logic of the PN/PN coupler are electrically
linked.
Ungrounded incoming supply
Non-grounded operation of the PN/PN coupler is possible with a 24 V DC power supply.
See also
Parameters (Page 34)
