Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Product Information on CPU319-3 PN/DP, 6ES7318-3EL00-0AB0

A5E00688649-02

Word and DWord access to the last valid addresses in an operand range

Word and DWord access to the last valid addresses in an operand range does not

result in a length-of-range error. If the initial address lies within the allowable ad-

dress range (E, A, M, L, D) but the final address lies outside this range, no length-

of-range error is generated in the module version (no synchronization error OB call

or CPU stop).

For access by Word and DWord, part of the addressed bytes can lie outside the

permissible range. Once access is completely outside the permissible range, a cor-

responding synchronization error is generated.

Example:

Access to a DB with 100 byte length (DBB0 to DBB99)

”T DBD 98” uses the addresses 98 to 101

Since the initial address is within the operand range, no length-of-range error is

generated.

However, the non-existent memory addresses 100 and 101 are also accessed.

The content of the non-existent memory area is undefined after access, and may

not be used by the user program.

This ensures data in other operand ranges is not overwritten during access.

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