3
07.96
Description
3-15
Siemens AG 1996 All Rights Reserved 6ZB5 430–0BH02–1AA0
SINUMERIK 805SM / 840C (BS)
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:
Cyclic operation between master and slave running
0 signal:
Fault during cyclic operation, data transmission fault.
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.
Fault on the module (system error message)
System error messages are indicated by the flashing of the slave status
indicator (FAULT, red LED).
Slave status indicator
FAULT LED, red
Error message
Comment
1 time on, pause, 1 time on, ...
Slave functionality dis-
abled
Slave must be enabled
via S2.3 (see Section
2.2.1)
2 times on, pause, 2 times on, ...
Hardware fault on
Replace module
3 times on, pause, 3 times on, ...
Hardware fault on
module
Replace module
4 times on, pause, 4 times on, ...
module
Interface to the local bus of the control is disabled. When the module is
accessed, the control reacts with acknowledgement delay (TO).
Cyclic data transmission between master and slave is terminated.
Monitoring of
cyclic operation on
the slave side by
the user
Example
Possible faults
Consequences
3.2 Description of the DP standard slaves
