Diagnostics And Troubleshooting; Overview; External Indications Of Diagnostic Information - Honeywell 900U02-0100 User And Installation Manual

10.
10.1.

Overview

The ControlEdge HC900 system incorporates a comprehensive set of diagnostic tools that test hardware
and software operation. Diagnostic software elements are contained in each system component. The
diagnostic elements that are executed at any given time depend on operating conditions such as current
operating mode and the current status of hardware and software. As long as power is applied, each major
component of the controller will execute one or more diagnostic elements.
Diagnostics have two functions; they:

Automatically alter system operation to react appropriately to operating conditions (particularly
in the event of a system fault).

Provide external indications that enable operating and maintenance personnel to react
appropriately when external actions are required.
10.2.

External Indications of Diagnostic Information

The following diagnostic indicators are provided.

Light Emitting Diodes (LEDs) included in controller hardware. Locations of LEDs are shown
in the following figures and tables. The LEDs are useful when personnel are performing
troubleshooting activities solely at the controller. Also, they are useful for verifying
indications viewed as screen items.
LED indicators
Controller CPU indicators
Scanner indicators
I/O Module Indicators
Ethernet Switch indicators

Screen items on:

The Operator Interface connected to the galvanically isolated RS-485 port. See Operator
Interface manual 51-52-25-108.

A PC with Designer Software/Process Control Utilities connected to the controller module
via the RS-232 Converter or the Ethernet 10Base-T Open Connectivity port. See the
Diagnostics section in the application's help.
Revision 8
September 2018

Diagnostics and Troubleshooting

HC900 Process & Safety Controller User and Installation Manual
Diagnostics and Troubleshooting
See page
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