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2651BC Berkel & Rodenrijs
4E-FMTC installation and user guide
Author:
DD
Page 6 of 17
4.1.2.
Redundant link
If you need to make a redundant L-Net connection to the Compact 500 main unit, connect both L-Net
ports of the device to two L-Net ports on the C500 main unit. You can choose any L-Net port on the C500
main unit. This creates a double daisy-chain of the redundant A/B power and data link to the device and
ensures fail-safe networking in case of a single cable or port failure.
Both spurs of the redundant A/B link may be populated with other L-Net devices.
NOTE: The device is equipped with a power link jumper, which, by default, is in the ON position (pass-
through power over L-Net). In order to create a redundant link, the jumper must be moved to the OFF
position. The device will be then immune to a single port short-circuit of power bus.
When jumper 1 is closed (switch 1 on) the corresponding port 1 will pass through 24V DC from port 2 to
devices connected to port 1. Jumper 2 (switch 2) works accordingly, passing 24V DC received from port 1.
Power jumper should be used if the device is supposed to be connected via redundant link. In this case the
device must not pass through power towards the C500 on either of the 2 spurs of the redundant link.
Bottom view - location of power link jumpers
Power link jumpers.
