LS Industrial Systems XBC-DN10E, Руководство пользователя

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Chapter 10 Maintenance
XBC E-Type Main Unit 10-3 Ver. 1
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PLC system configuration errors
When the PLC system is configured with the XG5000 programming software,
parameters are set as well as expansion modules, depending on the PLC series. If an
expansion module is added in the configuration but is removed or not included in the
hardware setup, errors will occur. If the watchdog timer is set to a time less than the
PLC scan, a timeout will occur.
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PLC program errors
PLC program errors may only manifest themselves once the program is running. The
XG5000 programming software will detect many programming errors during program
development. The program may be correct but the program behavior can cause faults
within the PLC
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Malfunction of equipment connected to the PLC system
The PLC may be communicating with one or more devices using an industry standard
protocol. If there is an issue with the data format from the peripheral equipment of
electrical noise induced in the wiring, a communication error may result.
2. PLC Operational Errors
The PLC logs operational faults and determines if a system halt is warranted or to continue
operation.
a. PLC hardware problems
If a PLC CPU or external module fault is detected, the PLC RUN mode is halted.
Depending on the fault, the error or fault is logged and the PLC is allowed to continue
running.
b. Watchdog Timeout
The PLC Watchdog Timer should be set to a longer time than the total PLC scan. At the
end of each scan the Watchdog Timer is reset before it can timeout. If the Watchdog
Timer times out it indicates something has happened with normal program operation.
c. Error detected with a peripheral device
Errors can be detected with serial and Ethernet communication and expansion/specialty
modules. In some cases, the PLC will be allowed to continue operation.
Remark
(1) Errors and faults codes are indicated in F Data Area, F002 and F003
(2) For description and details of F Data Area, see Chapter 6.7