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The following diagram shows the internal behavior of this service.

For multiple accesses to the same object entry, the following sequence reduces the performance overhead, which are based on searching within the object directory. The object functions takes the pre-searched object entry (see service CODirFind()) as first argument:

obj = CODirFind(&demo.Dir, CO_DEV(0x1234,0x56));
 
do {
    COObjRdValue(obj, &value, 4, 0);
 } while (value == 0);