Table 10: Network Engine LEDs designation, normal status, description, and other conditions
LED Normal Descriptions/Other Conditions
FC B (Green) Flicker
On Steady = Controllers are defined to FC B (FC Bus 2 or N2 Trunk 2) in the
network engine, but none are communicating. (network engine transmitting
only)
Flicker = Normal communications; FC B port is transmitting and receiving
data. Flickers are generally in sync with data transmission but should not be
used to indicate specific transmission times. Also, the flicker rate for the MS/
TP bus is different from the rate for the N2 Bus.
Off Steady = No field controllers are defined to FC B (FC Bus 2 or N2 Trunk 2)
in the network engine.
PEER COMM (Green)
Varies (see next
column)
Flicker = Data traffic between network engines. For a network engine that
is not a Site Director, this LED indicates regular heartbeat communications
with the Site Director. For a Site Director network engine, flashes are more
frequent and indicate heartbeat communications from all other network
engines on the site. For a single network engine on a network without an
ADS, there is no flicker.
Run (Green) On Steady
On Steady = network engine software is running.
On 1 second, Off 1 second = network engine software is in startup mode.
On 0.5 seconds, Off 0.5 seconds = network engine software is shutting down.
Off Steady = Operating system is shutting down or software is not running.
24 VAC (Green) On Steady
On Steady = 24 VAC power is present.
Off Steady = Loss of 24 VAC power. In the Off Steady condition, the network
engine can be running on battery power. Also see the POWER LED.
BATT FAULT (Red) Off Steady
On Steady = Battery fault. Replace the battery. Battery is not connected
or cannot be charged. The BATT FAULT LED may remain On for up to 24
hours after initially powering on the network engine. If the BATT FAULT LED
remains on longer than 48 hours after initially powering on the network
engine, check the battery connection or replace the battery.
GENL FAULT (Red) Off Steady
On Steady = General Fault. Fault conditions are user configurable in
software. Preconfigured fault conditions include excessive memory use,
excessive flash use, excessive CPU or PWB temperature, and Battery Fault.
In normal operation, the GENL FAULT LED stays on steady for the first half of
the startup sequence.
Wiring considerations and guidelines for network integrations
Table 11: Network Engine Ethernet network rules
Category Rules and Maximums
General Star topology with network switches
Number of Devices Maximum of 1,000 devices permitted at one site in the Metasys network.
2,000 m (6,600 ft) for plastic/glass fiber optic with external adapter
Line Length and Type
10 BaseT: 100 m (330 ft) Cat5 or Cat6 cable
100 BaseT: 100 m (330 ft) Cat5 or Cat6 cable
1000 BaseT: 100 m (330 ft) Cat5E or Cat6 cable
Terminations For 10/100/1000 BaseT, no line terminators allowed.
NAE55 Installation Guide14
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