Channel-Specific Diagnosis - Siemens SIMATIC ET 200M Manual

Commissioning and Diagnostics
6.4.7

Channel-Specific Diagnosis

Definition
The channel-specific diagnosis gives information on channel errors of modules and
expands on the module diagnosis.
The channel-specific diagnosis begins after the module status or after
the H status. (see Section 6.4.8)
The channel-specific diagnosis does not affect the module status.
Important: The diagnostic interrupt must be switched on for each module!
Channel-Specific Diagnosis
The channel-specific diagnosis is only contained in the diagnostic frame if you
have enabled enhanced diagnosis during parameter assignment.
The maximum number of channel-specific diagnoses is limited by the maximum
overall length of the slave diagnosis of 64 bytes in the IM 153-1 and 96 bytes in the
IM 153-2. The length of the slave diagnosis depends on the number of currently
pending, channel-specific diagnoses. If there are more channel-specific diagnoses
than can be represented in the slave diagnosis, bit 7 (diagnostic overflow) is set in
station status 3.
Tip: If you disable the interrupts for the ET 200M during parameter assignment,
there are still up to 29 additional bytes available in the interrupt section for the
channel-specific diagnosis (see also Figure 6-5 on Page 6-18).
6-24
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Distributed I/O Device ET 200M
EWA-4NEB780600602-06