Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual Manuel d'utilisateur télécharger pdf (Page 60)

Publication 1769-RM016A-EN-P - July 2006

60 Module Diagnostics and Troubleshooting

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 pushbuttons, 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.

Power Cycle Diagnostics

When you cycle power to the module, a series of internal diagnostic tests are

performed. These diagnostic tests must be successfully completed or a module

error results and is reported to the controller.

Module Error Definition

Table

Module errors are expressed in two fields as four-digit Hex format with the

most significant digit as don’t care and irrelevant. The two fields are Module

Error and Extended Error Information.

Module Error Table

Module Error Field

The purpose of the module error field is to classify module errors into three

distinct groups, as described in the table below. The type of error determines

what kind of information exists in the extended error information field. These

types of module errors are typically reported in the controller’s I/O status file.

Refer to your controller manual for details.

Don’t Care Bits Module Error Extended Error Information

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

00 0 0 000000000000

Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 97 98

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Rockwell-automation 1769-BOOLEAN Compact I/O Module Reference Manual Manuel d'utilisateur Page 60