PROFIBUS DP Communication Module
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06
8-33
8.9.9 Channel-Based Diagnosis
Definition
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).
Channel-based diagnosis
The structure of the channel-based diagnosis is as follows:
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.
1 0 0 0 0 0 0 0
765 0
Byte 13
Bit number
Code for channel-based diagnosis
1 1 0 0 0 0 0 0
765 0
Byte 14
Bit number
Input/output channel
765 0
Byte 15
Bit number
Channel type:
Error type (table on the next page)
000
B
: No special channel type
Byte 16 to
Next channel-based diagnosis message
(same assignment as byte 13 to 15)
max. byte 31
Byte 18
to
0 0 0
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