Siemens SIMATIC ET 200S Operating Instructions Manual page 220

1Count5V
3.9 Position feedback
Error Detection
The program errors must be acknowledged. They have been detected by the 1Count5V and
are indicated at the feedback interface. Channel-specific diagnostics are performed if you
have enabled group diagnostics in your configuration (see device manual of the interface
module used).
The parameter assignment error bit is acknowledged by means of correct parameter
assignment.
Figure 3-44
In the case of constant error acknowledgement (EXTF_ACK = 1) or in CPU/master STOP
mode, the 1Count5V reports the errors as soon as they are detected and clears the errors as
soon as they are eliminated.
220
Error Acknowledgment
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07