Siemens IM 328–N Description page 54

Description
3.3 Description of the L2-DP slave up to V3.x
3.3.4
3
Effects of fault
Monitoring of
cyclic operation on
the slave side by
the user
Example
3-26
Fault during data transmission
The following faults are possible in data transmission:
SINEC L2–DP module is disconnected from the bus (e.g. bus connector
unplugged)
Master broken down or switched off
Configuration of the module does not correspond to the configuration data
of the master
If threshold monitoring (system parameter) is activated, a fault in data trans-
mission (i.e. a bus fault) is displayed by the STATUS DISPLAY SLAVE as
follows:
Status display slave:
Reset of the inputs implemented by the slave in the slave station.
Cyclic attempt of the module to link to the SINEC L2-DP bus.
Note
If no response monitoring is activated, the inputs of the station concerned are
also not reset if a fault occurs but they remain unchanged.
The user can detect a fault in data transmission, that is, a fault of the cyclic
operation between master and slave on the slave side by means of a user-
defined sign-of-life bit (pre-condition: threshold monitoring activated).
An output bit of the slave to be monitored is set on the master side and the
signal state of the corresponding input bit is read on the slave side and it is
evaluated as follows:
1 signal:
0 signal:
Based on the signal state of this input bit, the user can have a suitable error
message displayed and can program the behaviour of the control in the case
of this fault.
RUN (green)
FAULT (red)
Cyclic operation between master and slave running
Fault during cyclic operation, data transmission fault.
6ZB5 430–0BH02–1AA0 Siemens AG 1996 All Rights Reserved
07.96
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SINUMERIK 805SM / 840C (BS)