Siemens simatic et 200s Operating Instructions Manual page 230

1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
Error Acknowledgment EXTF_ACK
You must acknowledge the corrected errors (load voltage missing, short circuit of the sensor
supply and open circuit/short circuit of the sensor signals).
What You Do
Your control program detects the set feedback bit ERR_2L+
or ERR_ENCODER.
Execute your application-specific error response.
Eliminate the cause of the error.
Switch the EXTF_ACK control bit from 0 to 1
Switch the EXTF_ACK control bit from 1 to 0
In the case of constant error acknowledgment (EXTF_ACK=1) or at CPU/Master Stop, the 1PosSSI/Digital reports the
errors as soon as they are detected and deletes them as soon as they have been eliminated.
Parameters
Parameters
Enables
Group diagnostics
Encoder signal
diagnostics
230
Response of the 1PosSSI/Digital
Feedback bit ERR_2L+ = 1
and/or
feedback bit ERR_ENCODER=1
The 1PosSSI/Digital sets the feedback bits ERR_2L+ = 0
and ERR_ENCODER = 0.
This tells you that the cause has been eliminated and
acknowledged.
If ERR_2L+ = 1 and/or ERR_ENCODER = 1, the cause of
the error is not yet eliminated.
Meaning
When group diagnostics is enabled, an
encoder error (ERR_ENCODER), no load
voltage (ERR_2L+) or a parameter
assignment error will result in a channel-
specific diagnostics.
Encoder signals D, /D and C, /C are
monitored for short circuit and wire break.
Value range
Disable
•
Enable
•
On
•
Off
•
Operating Instructions, 05/2007, A5E00124871-04
Default setting
Disable
On
ET 200S Positioning