Channel-Based Diagnosis - Siemens SIRIUS 3RW44 User Manual
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8.9.9 Channel-Based Diagnosis
Definition
Channel-based diagnosis
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06
The channel-based diagnosis provides information about channel errors of the
modules (here: soft starter) and represents a specification of the code-based
diagnosis. The channel-based diagnosis starts after the module status. The
maximum length is restricted to the maximum overall length of the slave
diagnosis, i.e. 31 bytes. The channel-based diagnosis does not affect the
module status.
The number of channel-based diagnosis messages is restricted to 9 (also refer
to station status 3, bit 7).
The structure of the channel-based diagnosis is as follows:
7
6 5
Byte 13
1 0 0 0 0 0 0 0
7
6 5
Byte 14
1 1 0 0 0 0 0 0
7 6 5
Byte 15
0 0 0
Channel type:
000
: No special channel type
B
Byte 16 to
Byte 18
to
max. byte 31
Figure 8-7: Structure of the channel-based diagnosis
Notice
The channel-based diagnosis is always updated up to the current diagnosis
message in the diagnosis telegram. Subsequent older diagnosis messages are
not deleted. Remedy: Analyze the valid current length of the diagnosis telegram:
• STEP 7 from the RET_VAL parameter of SFC 13.
PROFIBUS DP Communication Module
0
Bit number
Code for channel-based diagnosis
0
Bit number
Input/output channel
0
Bit number
Error type (table on the next page)
Next channel-based diagnosis message
(same assignment as byte 13 to 15)
8-33
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