Ethernet Communications Modules, 3rd Edition, Rev. D
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Chapter 7: Maintenance and Troubleshooting
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ECOM Module Diagnostic LEDs
H0 Series Indicators
The H0 series ECOM module has four status indicators. The table below explains the status
for each indicator.
OK Indicator
The green OK LED on the H0-ECOM module is ON steady after a successful powerup. If the
LED fails to turn on, the module failed to powerup. It may not be properly installed or it may
be defective.
LINK Indicator
The green LINK (link good) LED is ON steady when the ECOM module is correctly
connected to an active device on the network and is receiving 5VDC operating voltage from
the PLC power supply. The LINK LED verifies that the proper cables are connected, and the
ECOM module is functioning correctly. If a mismatch with the 10/100BaseT connections
occurs this LED will not be illuminated.
ACT Indicator
The red ACT (activity) LED flashes to indicate that the module sees data traveling on the
network. If any network device is sending or receiving data, the ACT LED will be illuminated.
In idle mode (no network traffic) this LED is OFF. During heavy communication loads this
LED will be steady ON.
ERR Indicator
If the ECOM module’s red ERROR indicator is flashing or ON steady, a fatal error has
occurred. The error may be in the ECOM module itself, or a network problem may be causing
this symptom. The ERROR indication can be caused by a faulty ground, an electrical spike or
other types of electrical disturbances. Cycle power to the system to attempt clearing the error.
100MBIT Indicator
The green 100 (100MB) LED is ON steady when Ethernet data is detected at 100BaseT
frequency. (H0- ECOM100 only)
Indicator Status Description
OK (H0-ECOM only)
ON - Green Module is powered up and functional
OFF Module power-up failed
LINK
ON - Green Properly connected to network
OFF Not connected to network or incorrect configuration
ACT
ON or Flashing Red Active network data
OFF Network idle
ERR
ON or Flashing Red A fatal error has occurred
OFF No error present
100
(H0-ECOM100 only)
ON - Green Ethernet data is detected at 100 Mbit
OFF (with ACT LED ON) - Ethernet data is detected at 10 Mbit
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