HC900 Hybrid Controller Installation and User Guide

Diagnostics and Troubleshooting - External Indications of Diagnostic Information
Revision 5 HC900 Hybrid Controller Installation and User Guide 119
9/03
Table 23 - LED Indications on Main CPU
LED LED State/Color Indicates Condition:
Controller
Status
Off
Solid Red
Blinking Red
Solid Green
Blinking Green
Solid Yellow
No power.
Failed
(Diagnostic Code; refer to Table 27.)
PROGRAM Mode
RUN Mode
OFFLINE Mode
RS232 port:
PC Config'n tool:
XMT (upper LED)
RCV (lower LED)
Green (On/Off)
Green On/Off
On when first byte is sent, Off when the last
byte is sent.
On when first byte is received, Off when the
last byte is received or failure is detected.
RS485 port
(Operator Interface)
XMT (upper LED)
RCV (lower LED)
Green (On/Off)
Green (On/Off)
On when first byte is sent, Off when the last
byte is sent.
On when first byte is received, Off when the
last byte is received or failure is detected.
Green (On/Off)
Green (On/Off)
On while message is being sent from the Main
CPU; otherwise Off.
On while the Main CPU is receiving a message.
Remains On as long as host is present; Off
when the host is removed from the link.
10Base-T port
(LAN/Internet)
XMT (upper LED)
LINK (lower LED)
NOTE: These LEDs indicate activity on the communication port, they are
controlled by hardware (PHY chip), not by software.
Green (On/Off)
Green (On/Off)
On when activity is present on the link.
On when another 10Base-T PHY is present on
the link
10Base-T port
(I/O Expansion –C50
CPU only)
LAN (upper LED)
LINK (lower LED)
NOTE: These LEDs indicate activity on the communication port, they are
controlled by hardware (PHY chip), not by software.