Chaper 4 – Troubleshooting
31
Siemens Industry, Inc.
BACnet ATEC Owner's Manaul
125-5050, Rev. AA
4/20/2010
Safety Features
The controller board stores the controller's address, applications, and point values. In
the event of a power failure or a reset, these values are retrieved from the controller's
permanent memory and are used by the controller unless overridden by a field panel. If
one of the following conditions occurs, the controller will activate safety features
present in its fail-safe mode.
Sensor failure.
Loss of power. Upon controller power loss, communication with the controller is
also lost. The controller will appear as failed (*F*) at the field panel.
Controller LEDs
NOTE:
The TX and RX LEDs indicate communication over the FLN.
To determine if the controller is powered up and working, verify that the Basic Sanity
Test (BST) Light Emitting Diode (LED) is flashing ON/OFF once per second. The
controller contains seven LEDs located on the circuit board. See the Controller LED
lndicators [
12
] section of
Chapter 1 - Product Overview [
9] for more information
about LEDs.
