15 diagnostics troubleshooting Training PLC Allen Bradley

FAULT OVERVIEW• Fault is unexpected condition that had bad effect to the process • Whether it cause a major problem or minor • Depending on the application, it may not make all faults

DAY 4

SESSION 3

FAULT OVERVIEW

• Fault is unexpected condition that had bad effect to the

process

• Whether it cause a major problem or minor

• Depending on the application, it may not make all faults to shut down your entire system

• It can use a fault routine to clear a specific fault and let at least

some of the system continue to operate

• And also can be used to monitor a minor fault which is will not

shutdown the controller

FAULT CONDITION

• According to the effect/severity caused by the fault it can be

classify to two condition

• Major Fault

• Minor Fault

• Major Fault is a fault condition that severe enough for the

controller to shutdown

• Minor Fault is a fault condition isn’t too severe for the

controller to shutdown

MAJOR FAULT CONDITION

• By what does it caused, Major Fault can be classified to three

condition

• First is execution fault of an instruction

• Second is system fault including power loss, IO failure, task

watchdog,mode change, and motion axis

• The last is user defined error or fault

MINOR FAULT CONDITION

• Minor Fault classify as the Minor system Fault and Minor

instruction Fault

• System Fault

• Periodic Task Overlap

• Load from nonvolatile Memory

• Problem with serial port

• Low Battery

• Instruction Fault

MONITORING MINOR SYSTEM

FAULT

• Periodic Task Overlap: Monitoring the 6 bit from FAULTLOG

object MinorFaultBits Attribute

• Load from Nonvolatile memory: Monitoring the 7 bit from

FAULTLOG object MinorFaultBits Attribute

• Problem with the serial port: Monitoring the 9 bit from

FAULTLOG object MinorFaultBits Attribute

• Low Battery: Monitoring the 10 bit from FAULTLOG object

MONITORING MINOR

INSTRUCTION FAULT

• Monitoring Minor Instruction Fault involving S:MINOR ,Minor

Fault Flag status register, for the Minor Fault Condition

• When S:MINOR set, which that mean an Minor Fault happened,

detail fault information is catch by GSV command

CLEAR FAULT VIA MENU

• Saat processor mengalami fault, harus dicarikan dan dikoreksi

penyebabnya sebelum mencoba menghilangkan fault

• Jika penyebab belum ditemukan, processor akan berperilaku

yang tidak diharapkan.

• Jika processor MicroLogix 1000 atau ControlLogix 500

mengalami fault, harus dihilangkan fault-nya sebelum program

jalan Untuk menghilangkan fault pada processor, pilih Comms

> Clear Fault.

FAULTED

CLEAR FAULT VIA STATUS

DISPLAY

STATUS DISPLAY(1)

STATUS DISPLAY(2)

CONTROLLOGIX I/O ERROR(1)

• Karakter xx dalam kode menyatakan nomor slot dalam

hexadecimal(h)

• Jika slot secara eksak tidak bisa ditentukan,karakter xx menjadi

1F

• Kebanyakan fault I/O dapat direcoveri, dengan cara

mendisable slot(xx) yang bersangkutan pada user fault

routine

• Jika tidak didisable, processor akan fault pada akhir scan

• Modul I/O yang rusak dapat menyebabkan processor

mengindikasikan bahwa error ada pada slot 1 meskipun modul

MAJOR AND MINOR CODE

MAJOR FAULT TYPE AND CODE (1)

MAJOR FAULT TYPE AND CODE (2)

MAJOR FAULT TYPE AND CODE (3)

MINOR FAULT TYPE AND CODE (1)

MINOR FAULT TYPE AND CODE (2)

SESSION 4