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SmartPLC SafeLine with PROFIBUS slave interface
216
Header of the diagnosis alarm block
41478
Element
No. of
bits
Contents
[bin]
Description
Block length
6
Number of bytes of the diagnosis alarm block including the header
(= alarm data + 4 bytes)
Alarm type
7
000 0001
Alarm type = diagnosis alarm
Slot number
8
0000 0000
Alarms are always transferred on the first slot.
Sequence number
5
0 0000
The sequencing mode is not used.
Add ack
1
0
Additional acknowledge = 0:
The user does not have to acknowledge the fault.
Alarm specifier
2
01
Coming error: Device has one or several upcoming errors. This alarm can
be sent several times if other errors are added or disappear but there still
is at least one upcoming error.
10
Leaving error: There is no longer any error in the device.
Notes on the comparison with Profinet:
With Profinet the device diagnosis alarms are transferred to slot 0 which corresponds to the host.
With Profibus the slots are indicated in the range from 0...254 which, however, corresponds to
slots 1...255. Therefore the device diagnosis alarms are transferred to slot 1 in Profibus!
In Profibus, only the slot numbers in the alarms are transferred. In Profibus there are no subslots
and channels as in Profinet.