Troubleshooting Procedure - Omron E5ZN Operation Manual

Troubleshooting Procedure

8-1 Troubleshooting Procedure
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If the E5ZN has an error, refer to the following items to find the possible cause
of the error and take corrective measures.
1. Indicators
Check the operating status of the E5ZN using the indicators.
If the ERROR indicator is lit, turn the E5ZZ OFF and ON. If the ERROR
indicator is not lit after the E5ZN is turned ON, it may mean that the E5ZN
is being influenced by noise. Find the source of the noise and provide ad-
equate protection against it.
2. Switch, Selectors, and Wiring
Check if the switch and selector settings of the E5ZN, the wiring of the
E5ZN and devices connected to the E5ZN are correct.
a) Power Supply
• Check that the power supply connected to the E5ZN is turned ON.
• Check whether the supply voltage at the power supply terminals is
within the allowable voltage range of the E5ZN.
b) Switch and Selectors
Check that the switch and selectors of the E5ZN are correctly set ac-
cording to the system.
c) Wiring
• Check that the terminal block wiring is correct.
• Check that the polarity of each wire connected to the E5ZN is correct.
• Check if any wire is disconnected.
• Check if a wire or cable is cut or short-circuited.
d) Communications Conditions
Check that the communications conditions of the E5ZN are compatible
with the host connected to the E5ZN.
Check the above items and remedy any problems listed above. If the error
persists after error processing, perform further checks through communi-
cations.
3. Checking through Communications
• Check the end code and error code with the response returned from
the E5ZN.
• Check the status of the E5ZN with the Status Read Command.
• Check if the functions used with the E5ZN have any operating restric-
tions.
• Check if the set data items of the communication commands used for
the E5ZN are correct.
Troubleshoot problems on the basis of the data read with the E5ZE.
4. Troubleshooting Based on Error Symptoms
If the cause of the error is still unknown after checking all the previously
mentioned items, find the cause by isolating the symptoms of the error
while referring to the tables in 8-2 Communications Errors , and correct the
problem accordingly.
Section 8-1