Rockwell Automation 57C421B Pulsetach Input Module/DCS 5000/AutoMax - Manual (Page 50)

5Ć8
Step 2. Verify that the hardware is working correctly.
WARNING
INSERTING OR REMOVING A MODULE OR ITS CONNECTING CABLES MAY
RESULT IN UNEXPECTED MACHINE MOTION. TURN OFF POWER TO THE RACK
BEFORE INSERTING OR REMOVING A MODULE OR ITS CONNECTING CABLES.
FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN BODILY INJURY.
The problem may be in one of three areas. Replace these
items one at a time and determine whether the problem
has been corrected before attempting to replace the next
item. First replace the Pulsetach Input module, then the
Processor module(s), and finally the backplane.
Step 3. If you are using the comparator equal function, you must
set the comparator value before you enable the
comparator equal interrupt (bit 11 of register 5).
The TIMEOUT parameter in the EVENT statement should
be disabled if interrupts are not timeĆbased. See section
4.4.3 for an example.
At power up, all internal registers are reset to zero. If you
do not set the comparator value before you enable the
interrupt at power up, when all internal registers are equal
to zero, a comparator equal interrupt will be issued (error
code 1b").
5.3.4 Illegal Interrupt Detected
This condition results in error code 1F" appearing on the faceplate
of the Processor module. It means that a hardware interrupt has
occurred and no event has been defined using the (BASIC) EVENT
statement. When this error occurs, all tasks in the rack will be
stopped:
Step 1.
Verify that the application task is correct.
Verify that your interrupt response task contains an
EVENT" statement that will be executed. Check carefully
to determine whether a higher priority task is preventing
the interrupt response task from running.
Step 2. Verify that the hardware is working correctly.
WARNING
INSERTING OR REMOVING A MODULE OR ITS CONNECTING CABLES MAY
RESULT IN UNEXPECTED MACHINE MOTION. TURN OFF POWER TO THE RACK
BEFORE INSERTING OR REMOVING A MODULE OR ITS CONNECTING CABLES.
FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN BODILY INJURY.
The problem may be in one of three areas. Replace these
items one at a time and determine whether the problem
has been corrected before attempting to swap out the
next item. First replace the Pulsetach Input module, then
the Processor module(s), and finally the backplane.