Ethernet switch (MM) FN2008-A1
20
Pin assignments
123
Building Technologies
008837_q_en_--
Fire Safety
14.05.2012
Element
Position Function
Buttons
Kit
Button for configuration
Back
1
Locking fastener for DIN rail
2
Screw-on cover for C-plug (option)
20.3
Pin assignments
20.3.1
Connector strip for supply
Pin
Designation
Description
1
L1+
Supply input 1 (+DC 24 V)
2
M1
Supply input 1 (DC 0 V)
3
M2
Redundant supply input 2 (DC 0 V), optional
4
L2+
Redundant supply input 2 (+DC 24 V), optional
The L1+/M1 and L2+/M2 connections are designed for redundant supply and are
not plated-through. Use of the redundant L2+/M2 supply inputs is optional and not
necessary for EN-54 compatibility.
20.3.2
Connector strip for detector contact
The detector contact is a potential-free relay contact which can be used to report
error states by interrupting contact.
The following errors can be signaled by the detector contact:
Loss of a link on a monitored port
Failure of a redundant source of voltage
Incompatible C-plug inserted
The detector contact remains activated until the error is rectified or until the current
status is adopted by the button as the new nominal status.
The detector contact is always activated (opened) by switching off the FN2008-A1.
Pin
Designation
Description
1
F1
Detector contact 1
2
F2
Detector contact 2
20.3.3
Connecting optical Ethernet
Wiring a loop network with four network nodes
To set up a redundant loop topology with the Ethernet switch (MM) FN2008-A1,
both free ends of the optical Ethernet must be joined to form a loop.
