Rockwell Automation 61C544A RTD Module - Manual (Page 45)

5Ć1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section explains how to troubleshoot the module and field
connections. Ifyou cannot correct the problem using the instructions
below, the module is not userĆserviceable. Ifthe procedure calls for a
component to be swapped with a replacement part and the problem
is not corrected, replace the original component and go on to the
next step.
5.1 Incorrect Data
Problem: The data is always on, always off, or different than
expected. The possible causes ofthis are a module in the wrong slot,
a programming error, or a malfunctioning module. It is also possible
that the RTD is either not wired or is wired incorrectly. Use the
following procedure to isolate the problem:
Step 1.
Connect the programming terminal to the system and run
the ReSource Programming Executive Software.
Determine whether the channel is configured by
examining register 21. Ifit is not, use the procedure in
section 4.2 to configure the channel.
Step 2. For DCS 5000/AutoMax systems, verify that the module
configuration is correct. Verify that the RTD module is in
the correct slot.
Verify that the slot number being referenced agrees with
the slot number ofthe module.
For remote I/O installations, verify that the master slot and
remote drop numbers are defined correctly.
Step 3. Verify that the field wiring is properly connected.
DANGER
THIS EQUIPMENT IS AT LINE VOLTAGE WHEN AĆC POWER IS CONNECTED.
DISCONNECT AND LOCK OUT ALL UNGROUNDED CONDUCTORS OF THE AĆC
POWER LINE. FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN
SEVERE BODILY INJURY OR LOSS OF LIFE.
Turn off power to the module.
Confirm that all terminal board connections are tight.
Check the cables for continuity between the faceplate
connector and the terminal board assembly.
Turn on power to the module.
Step 4. Check for an RTD out of range condition.
Monitor register 20. Use the MONITOR function in DCS
5000/AutoMax systems or the POINT MONITOR function
in AutoMate systems.