Rockwell Automation 61C516 AutoMax/AutoMate 24VAC/DC Input Module - Manual (Page 21)

5Ć3
5.2 Bus Error
Problem: A 31" or 50" through 58" appears on the Processor
module's LED in DCS5000/AutoMax systems. In AutoMate systems,
a 1" appears in any bit location of register 3764 of an AutoMate 30
or register 17564 of an AutoMate 40. This error message indicates
that there was a bus error when the system attempted to access the
module. The possible causes of this error are a missing module, a
module in the wrong slot, or a malfunctioning module. It is also
possible that the user is attempting to write to the wrong registers on
the module. Refer to instruction manual for the Processor module in
the rack for more information.
Step 1.
Verify that the input module is in the correct slot and, for
DCS5000/AutoMax systems, that the I/O definitions are
correct.
Verify that the slot number being referenced agrees with
the slot number of the module. In DCS5000/AutoMax
systems, this module's register number is always zero.
Verify that the register number and bit number are correct.
For remote I/O installations (DCS5000/AutoMax systems
only), also verify that the master slot and remote drop
number are defined correctly.
Step 2. Verify that the module can be accessed.
Connect the programming terminal to the system and run
the ReSource Software. Use the MONITOR I/O function to
display register 0 in DCS5000/AutoMax systems. In
AutoMax systems, use the POINT MONITOR function to
display the point. If the programmer is able to monitor the
inputs, the problem lies in the application software
(proceed to step 3). If the programmer cannot monitor the
inputs, the problem lies in the hardware (proceed to step
4).
Step 3. Verify that the user application program is correct.
This module cannot be written to. If a DCS5000/AutoMax
BASIC task caused the bus error, the error log will contain
the statement number in the task where the error
occurred. If a Ladder Logic or Control Block task caused
the error, you will need to search the task for any instances
where you used an input as a ladder logic coil or wrote to
it in a control block task.
In AutoMate systems, search the task for any instances
where you used an input as a coil.
Step 4. Verify that the hardware is working correctly.
Verify the hardware functionality by systematically
swapping out the input module, Processor module(s), and
backplane. If the problem is not corrected after each
swap, replace the original item before swapping out the
next item.
For remote I/O installations (DCS5000/AutoMax systems
only), systematically swap out the input module, the slave
remote module, and the backplane. After each swap, if the
problem is not corrected, replace the original item before
swapping out the next item.