Troubleshooting 7.5 I/O Module Troubleshooting
There is a LED to indicate the connection between the base and an
I/O module in any ADAM-5000 system. The LED is on when the
connection is good. If you suspect an I/O error, there are several
things that could be causing the problem.
•
A loose terminal block
•
The power supply has failed
•
The module has failed
Some Quick Steps
When troubleshooting the ADAM-5000 series digital I/O modules,
there are a few facts you should be aware of. These facts may
assist you in quickly correcting an I/O problem.
•
The digital output modules can not detect shorted or open output
points. If you suspect one or more points on an output module
to be faulty, you should measure the voltage drop from the common
to the suspect point.
•
Leakage current can be a problem when connecting field devices to
I/O modules. False input signals can be generated when the
leakage current of an output device is great enough to turn on the
connected input device. To correct this, install a resistor in
parallel with the input or output of the circuit. The value of this
resistor will depend on the amount of leakage current and the
voltage applied but usually a 10K to 20 K
Ω
resistor will work.
Insure the wattage rating of the resistor is correct for your
applications.
•
The easiest method to determine if a module has failed is to replace
it if you have a spare. However, if you suspect another device to
have caused the failure in the replacement module as well. As a
point of caution, you may want to check devices or power supplies
connected to the failed module before replacing it with a spare
module.
7-6 ADAM-5000