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Element
Buttons
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20.3
20.3.1
20.3.2
20.3.3
Building Technologies
Fire Safety
Position
Function
Kit
Button for configuration
1
Locking fastener for DIN rail
2
Screw-on cover for C-plug (option)
Pin assignments
Connector strip for supply
Pin
Designation
1
L1+
2
M1
3
M2
4
L2+
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.
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
1
F1
2
F2
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.
Ethernet switch (MM) FN2008-A1
Description
Supply input 1 (+DC 24 V)
Supply input 1 (DC 0 V)
Redundant supply input 2 (DC 0 V), optional
Redundant supply input 2 (+DC 24 V), optional
Description
Detector contact 1
Detector contact 2
20
Pin assignments
123
008837_q_en_--
14.05.2012
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