5Ć6
c. When you have determined the slot and register
address at which the bus error occurred, go on to the
steps below. If THIS RACK SLOT #" referred to a
Remote I/O or Network module, make certain you are
working with thecard in theremoteor network drop
when you go on to the remaining steps in this section.
Step 2.
Verify that thereis a modulein theslot and that theI/O
definitions in theconfiguration arecorrect for themodule.
Refer to figure 3.2. Verify that the register numbers defined
in theconfiguration arevalid for themodule.
For remote I/O installations, also verify that the master slot
and remote drop number are defined correctly.
Step 3.
Verify that the module can be accessed.
UsetheI/O Monitor function in theReSourceAutoMax
Programming Executive to display the registers on the
module. If the personal computer is able to monitor the
registers, the problem lies in the application software (refer
to step 4). If you cannot monitor the registers, the problem
is in the hardware (refer to step 5).
Step 4.
Verify that the user application software is correct.
If a BASIC task caused the bus error, the error log will
contain the statement number in the task where the error
occurred. If a Control Block or Ladder Logic task caused
the error, you will need to search the task for any instances
where you wrote to an input.
Step 5.
Verify that the hardware is working correctly.
Verify thehardwarefunctionality by systematically
swapping out themodulein question, theProcessor
module(s) or slave Remote I/O module, and the
backplane. After each swap, if the problem is not
corrected, replace the original item before swapping out
the next item.
5.4
Common Memory Module Diagnostic
Failure
Problem: The green LED on a Common Memory module located in
slot 0 is off, and a Processor modulein therack displays codes 4.0.
through 4.6. These error codes mean that the Common Memory
modulehas failed oneof its powerĆup diagnostics.
Systematically swap out the Common Memory module and the
Processor module(s). After each swap, if the problem is not
corrected, replace the original item before going on to the next item.
If the problem persists, take all of the modules except the Common
Memory moduleand oneProcessor moduleout of therack. If the
problem is now corrected, another module in the rack is causing the
problem. Replace the remaining modules one at a time until the
problem reappears. If none of these tests reveals the problem, try
replacing the backplane.
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