Application and Installation Guide EMCP 4 SCADA Data Links
©2013 Caterpillar
All rights reserved. Page 37
When invalid data is suspected, the following troubleshooting steps should be followed:
1. Check whether the feature being tested is actually supported on this package
2. Check the definition of the data in this document, and determine whether the data may be unavailable
due to certain conditions not having been met (e.g. cooldown duration remaining is only available
while cooldown is underway)
3. Confirm that the data is actually invalid, rather than being user error. This can be done in a few
different ways:
a. If same data is available on EMCP 4 display, check value there; invalid data should show up
as asterisks (****)
b. If the data is available via ET from either the EMCP 4 or directly from the source device (if not
the EMCP 4 GSC), connect ET and check using the Status Data option
c. If known working Modbus software is available, such as the EMCP 3 Monitoring Software,
connect that and check the value shown (Grid Data view in the EMCP 3 Monitoring
Software).
4. Once the invalid data is confirmed, determine the source of the data; the definition of that data in this
document will help. Sometimes there are multiple sources (e.g., engine speed can come from
either the engine ECM over the Primary Data Link, or from a magnetic pickup sensor, and the
selected source must be configured as an EMCP 4 setpoint).
5. Once the source is determined, troubleshoot the sensor input(s) that generate this data. Common
problems are:
a. Poor or incorrect wiring, including the signal reference
b. Mismatched sensor type (either plugging the sensor in to the wrong input, or configuring the
input for a different sensor type or ma
6. Try disconnecting the sensor from the ECM and wiring separately to the sensor, or even to a
duplicate sensor that is not connected into the sensor port
7. Try a new sensor, or one that is known to be working
8. If the sensor can be connected to multiple places, try connecting to a different place (such as a
configurable digital or analog input on the EMCP 4), temporarily disabling the normal setting; if
that works, it may indicate a hardware fault with the sensing circuit
If none of these steps resolves the issue, contact your Caterpillar technical support representative.
An example of reading invalid data is given in Chapter 7.
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