Rockwell Automation 57C428 Toledo Scale Interface Module - Manual (Page 28)

5Ć2
If the transmitter is working correctly, repeat this process
on theconnector on theinterfacemodule. If the
oscilloscopedisplays a squarewaveagain, theinterface
module is malfunctioning. Otherwise, troubleshoot the
cabling.
5.2 Incorrect Data
Problem: The data is either always off, always on, or different than
expected. The possible causes of this problem are a module in the
wrong slot, a programming error, or a malfunctioning module. It is
also possiblethat theinput is not wired or is wired to thewrong
device. Usethefollowing procedureto isolatetheproblem:
Step 1.
Verify that the serial link is working correctly.
Refer to the procedure in section 5.1.
Step 2. Verify that theinput moduleis in thecorrect slot.
Refer to figure 3.3. Verify that the slot number being
referenced agrees with the slot number defined in the
configuration. Verify that the register numbers that have
been assigned to the variables agree with the definitions in
theconfiguration task.
Step 3. Verify that the module can be accessed.
Connect the programmer to the system and run the
ReSource Software.
Stop all tasks that may berunning.
Using the I/O MONITOR, toggle register 64 and verify that
the data in register 65 changes and that the data in
registers 65Ć72 is the correct scale data.
If theprogrammer is ableto read thedata, theproblem
lies in the application software (refer to step 4). If the
programmer cannot read the data, the problem lies in the
hardware (refer to step 5).
Step 4. Verify that the user application program is correct.
Verify that the application program that uses the symbolic
names assigned to the module has defined them as
COMMON.
Compareyour application program with theexamples
given in sections 4.3.2 and 4.3.3. In your program, make
certain that you are toggling register 64 before attempting
to read the data in registers 65Ć72.
Step 5. Verify that the hardware is working correctly.
Verify thehardwarefunctionality by systematically
swapping out modules. After each swap, if the problem is
not corrected, replace the original module before
swapping out the next module.
First, replace the input module. Next, replace the
Processor module (s). If the problem persists, take all of
themodules out thebackplaneexcept oneProcessor
moduleand theinterfacemodule. If theproblem is now
corrected, one of the other modules in the rack is
malfunctioning. Reconnect the other modules one at a