Honeywell 900U02-0100 User Manual

198 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Table 30 – LED Indications on Scanner Module
Figure
102 item
LED
LED State/Color
Description
1
Scanner Status
Off
Solid Red
Blinking Red
Solid Green
Blinking Green
No power
Failed
(Diagnostic Code; refer to Table 31 -
Scanner LED Diagnostics.)
Startup Mode
Scan Mode
2
3
10/100 Base-T port
XMT (upper LED)
LINK (lower LED)
Green (On/Off)
Green (On/Off)
On while a 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.
NOTE: These LEDs indicate activity on the communication port, they
are controlled by hardware (PHY chip), not by software.
Scanner Diagnostic LED Indication
The scanner uses its LED to communicate diagnostic information. These diagnostics are a subset of the
main CPU’s and are listed below.
Table 31 – Scanner LED Diagnostics
Number
of
Strobes
Possible Cause
Scanner Action
User Action
1
RAM or ROM failed
diagnostics on power-up.
Executes an infinite loop that toggles the
LED. Communications and module
scanning are disabled. Module outputs
are in the power-off state -- DO outputs
are off, and AO outputs are at zero
milliamps.
1. Cycle power
2. Replace scanner
3. Replace rack
4. Check grounding
5. Ensure system is properly
isolated from noise

Honeywell 900U02-0100 Specifications

General

Brand	Honeywell
Model	900U02-0100
Category	Controller
Language	English