Rockwell-automation 1769-OF4 Compact Analog Output Module Manual de usuario descargar pdf (Pagina 44)

44 Publication 1769-UM020A-EN-P - December 2009

Chapter 4 Module Diagnostics and Troubleshooting

Activate Devices When Troubleshooting

When troubleshooting, never reach into the machine to actuate a

device. Unexpected machine motion could occur.

Stand Clear of the Machine

When troubleshooting any system problem, have all personnel remain

clear of the machine. The problem could be intermittent, and sudden

unexpected machine motion could occur. Have someone ready to

operate an emergency stop switch in case it becomes necessary to

shut off power to the machine.

Program Alteration

There are several possible causes of alteration to the user program,

including extreme environmental conditions, electromagnetic

interference (EMI), improper grounding, improper wiring connections,

and unauthorized tampering. If you suspect a program has been

altered, check it against a previously saved program on an EEPROM or

UVPROM memory module.

Safety Circuits

Circuits installed on the machine for safety reasons, like over-travel

limit switches, stop push buttons, and interlocks, should always be

hard-wired to the master control relay. These devices must be wired

in series so that when any one device opens, the master control relay

is de-energized, thereby removing power to the machine. Never alter

these circuits to defeat their function. Serious injury or machine

damage could result.

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Rockwell-automation 1769-OF4 Compact Analog Output Module Manual de usuario Pagina 44