Johnson Controls IOM3733 Installation Guide

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

Johnson Controls IOM3733 Specifications

General

Brand	Johnson Controls
Model	IOM3733
Category	I/O Systems
Language	English