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Troubleshooting

9-18

SIMATIC 545/555/575 System Manual

9.6 Troubleshooting User EEPROMs or EPROMs

Portable EEPROMs and EPROMs cannot usually be repaired and must be

replaced if they become defective. Before replacement, read Chapter 7

carefully and perform the following checks:

• Ensure that the EEPROM programming enable strap is installed

correctly on the jumper pin E18. (See Figure 7-1.)

• Ensure that an (E)EPROM is installed, depending on your use.

• Ensure that all (E)EPROM pins are properly seated in the socket.

• For CPUs that support both portable and on-board EEPROM, ensure

that the jumper E20 is configured to select your target EEPROM. In

addition, if you select on-board EEPROM for program storage, ensure

that the portable EEPROM is not installed.

Other possible causes for errors include the following.

• The EEPROM may already have been programmed (and not erased).

Use the AUX 84 to erase program data on the EEPROM.

• The size of the user program (L, K, S, and U memories) that is being

stored may exceed the size of the (E)EPROM.

NOTE: To help ensure that the user program is saved, the total user

memory space occupied by the user program must not exceed the size of the

(E)EPROM minus 2 Kbytes. If the total user memory (not system memory)

space occupied by these user programs is greater than this value, none of

the data is saved and the error message OPERATION FAILED is displayed

on the screen when attempting to save the data.

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