Power-up and testing
6.4 EST3 Installation and Service Manual
Runtime and system errors
Introduction
There are two major categories of errors which can occur when
configuring a database for the network. The System Definition
Utility program is used to set up the contents of each cabinet.
Once all the cabinets have been defined, devices labeled, and
rules written, all this information is cross checked against itself.
This process is called compiling the program. If there are
incorrectly written rules, unreferenced input or output devices or
other problems with the design, the compiler will generate a list
of errors. These errors must be corrected using the SDU.
When the data has been properly compiled, the data is in a form
that the CPU memory can receive. Sending this information to
the memory of the various CPUs making up the network is
called downloading. If an error occurs during the download
process, it is referred to as a runtime error.
Runtime errors
There are a number of reasons that errors may occur when
downloading data into the CPU controllers. Initially, certain
“errors” are to be expected, as the network database is loaded in
steps. Until all portions of the database are properly entered into
memory, errors will be generated. During initial system
configuration, this is to be expected. Most of these errors will
resolve themselves as the system configuration progresses.
A second source of download errors is a mismatch between the
cabinet configuration in the SDU and the actual hardware
installation. The most common cause for this error is typically
due to the installation of a local rail module in the wrong rail
position. Another common cause is the installation of the wrong
type module in the rail. Misidentification of an entire cabinet can
also cause this type of error.
A third source of download error can occur after the cabinets
have been initially downloaded. After the initial downloads, all
subsequent downloads can be done using the network data
circuit. The third type of error is primarily caused by
communications problems between cabinets.
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