Siemens simatic et 200s Operating Instructions Manual page 364

1PosUniversal/Digital
7.6 Functions of the 1PosU
Parameters
Parameters
Enables
Group diagnostics
Encoder signal
diagnostics
Zero marker
diagnostics
Feedback Messages
Address Assignment
Byte 0 Bit 7: ERR_ENCODER
Bit 3: SYNC
Bit 2: POS_ DONE
Bit 1: POS_ERR
Bit 0: POS_ACK
Byte 4 Bit 7: ERR_2L+
Bit 1: JOB_ERR
Bit 0: JOB_ACK
364
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 A, /A and B, /B or D, /D
are monitored for short circuit and wire
break at 5 V differential signals.
At incremental position encoders and non-
activated dosing operation monitoring of
the signal sequence is also carried out. A
simultaneous edge change at Signals A
and B causes an error.
At an SSI encoder monitoring of the frame
is carried out additionally (start bit and stop
bit)
At incremental encoders with 5 V
differential signals the zero marker signals
N, /N are monitored for short circuit and
wire break.
Value range
Disable
•
Enable
•
On
•
Off
•
On
•
Off
•
Operating Instructions, 05/2007, A5E00124871-04
Default setting
Disable
On
On
ET 200S Positioning