Siemens SIMATIC ET 200S Operating Instructions Manual page 51

Acceptance of Values with the Load Function
Figure 2-18
Note
Only one of the following control bits can be set at a particular time:
CMP_VAL1 or CMP_VAL2 or LOAD_VAL or LOAD_PREPARE or C_DOPARAM.
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
Acceptance of Values with the Load Function
1Count24V/100kHz
2.6 Count Modes
51