ST950S Plus+ Installation and Commissioning Manual
Illuminated when the Primary CPU is not running, or an internal fault has been detected.
HB – Heartbeat (green)
Table 12. Heartbeat (green)
LED Pattern
Status
Flashes in a heartbeat pattern
Primary CPU software is operating normally
Flashes slowly (once per second)
Controller self test
Flashes quickly (several times per second)
Non normal operation e.g. start-up
SE - System Error (red)
Table 13. SE - Sysytem Error (red)
LED Pattern
Status
Permanently on
Fault is present, e.g. one or more entries present
in the Fault Table
Flashes slowly (with the Heartbeat LED flashing in
a heartbeat pattern)
Reserve Mode
Flashes quickly (with the Heartbeat LED flashing
in a heartbeat pattern)
Reserve Mode is latched; manual reset required
Flashes quickly along with the Heartbeat LED
(both flashing quickly)
Fault with the Primary CPU, e.g. self test fault
found
Flashes quickly at power-up (with the Heartbeat
LED off)
RTC faulty, e.g. backup support expired
SD – Shutdown (red)
Illuminated when the controller is in the Shutdown Mode i.e. signals are not being controlled.
FF – Fail Flash (yellow)
: not used for Plus
+
Flashes when hardware fail flash is active.
PRG – Program (blue)
Flashes to indicate programming of an IC4 configuration and / or new firmware is pending or in
progress.
Table 14. PRG - Program (blue)
LED Pattern
Status
Single pulse
IC4 configuration available for programming
Double pulse
Firmware upgrade available
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