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Introduction Section 8-1
8-1 Introduction
PC errors can be divided broadly into the following four categories:
1,2,3... 1. Program Input Errors
These errors occur when inputting a program or attempting an operation
used to prepare the PC for operation.
2. Programming Errors
These errors will occur when the program is checked using the Program
Check operation.
3. User-defined Errors
There are three instructions that the user can use to define his own errors
or messages. The instructions will be executed when a particular condition
(defined by the user) has occurred during operation.
4. Operating Errors
These errors occur after program execution has been started.
a) Non-fatal Operating Errors
PC operation and program execution will continue after one or more of
these errors have occurred.
b) Fatal Operating Errors
PC operation and program execution will stop and all outputs from the
PC will be turned OFF when any of these errors have occurred.
The PC’s indicators will indicate when a PC error has occurred and an error
message or code will be displayed on the Programming Console or host com-
puter if one is connected. The error code is also contained in SR 25300 to
SR 25307.
For the most recent errors, both the type of error and time of occurrence will
be recorded in the PC’s error log area. Details are provided starting on
page 441.
There are flags and other information provided in the SR and AR areas that
can be used in troubleshooting. Refer to Section 3 Memory Areas for lists of
these.
Note In addition to the errors described above, communications errors can occur
when the PC is part of a Host Link System. Refer to page 442 for details.
8-2 Programming Console Operation Errors
The following error messages may appear when performing operations on the
Programming Console. Correct the error as indicated and continue with the
operation. The asterisks in the displays shown below will be replaced with
numeric data, normally an address, in the actual display. Refer to the Ladder
Support Software Operation Manual, SYSMAC Support Software Operation
Manual: C-series PCs, or Data Access Console Operation Manual for errors
that may appear when operating the SSS or a Data Access Console.
Message Meaning and appropriate response
REPL ROM An attempt was made to write to write-protected memory.
In CQM1 PCs, set the write-protect switch (pin 1 of the CPU Unit’s
DIP switch) to OFF.
In CPM1/CPM1A/SRM1 PCs, set bits 00 to 03 of DM 6602 to “0.”
PROG OVER The instruction at the last address in memory is not NOP(00). Erase
all unnecessary instructions at the end of the program.
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