Johnson Controls IOM3733 Installation Manual page 13

LED status and states
Observe the Status LEDs on the front of the
expansion module. Table 7 provides LED status
Table 7: Status LEDs and description of LED states
LED label LED color
POWER Green
FAULT
Red
SA/FC BUS Green
EOL Amber
Normal LED
Description of LED states
state
Off Steady = No Supply Power. The expansion module's
polyswitch/resettable fuse may be open. Check output wiring for
On Steady
short circuits and cycle power to expansion module.
On Steady = Power Connected
Off Steady = No Faults
On Steady = Device Fault
Off Steady
Blink - 2 Hz = Download or Startup in progress: not ready for
normal operation
Blink - 2 Hz = Data Transmission (normal communication)
Off Steady = No Data Transmission (N/A - auto baud not
Blink - 2 Hz supported)
On Steady = Communication lost; waiting to join communication
ring
Off (Except on
On Steady = EOL switch in ON position
terminating
Off Steady = EOL switch in Off position
devices)
indicator information for troubleshooting the
expansion module.
IOM3733 Input/Output Module Installation Guide 13