Siemens SIMATIC ET 200S Operating Instructions Manual page 209

Acceptance of Values with the Load Function
Figure 3-42
Note
Only one of the following control bits can be set at a particular time:
LOAD_VAL or LOAD_PREPARE.
Otherwise, the ERR_LOAD error is reported until all the specified control bits are deleted
again.
The ERR_LOAD error bit is only deleted when the following is carried out correctly.
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05
Accepting Values with the Load Function (LOAD_VAL; LOAD_PREPARE;
C_DOPARAM; C_INTTIME)
1Count5V/500kHz
3.8 Position feedback
209