Siemens SIMATIC ET 200X, Manual

Page: 163 / 362

Commissioning and Diagnostics
5-39
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
5.6.8 Channel-specific diagnosis
Definition
The channel-specific diagnosis gives information on channel errors of modules and
expands on the module diagnosis. Channel-specific diagnosis begins after the
module status. Channel-specific diagnosis does not affect the module status.
Channel-specific diagnosis
Important: The diagnostic interrupt must be switched on for each module!
The channel-specific diagnosis is only contained in the diagnosis frame if have
activated the ”extended diagnosis” during parameterization.
The maximum number of channel-specific diagnoses is limited by the maximum
overall length of the slave diagnosis of 64 Bytes. The length of the slave diagnosis
is dependent on the number of the channel-specific diagnoses currently present.
If more channel-specific diagnoses are present than can be shown in the slave
diagnosis, bit 7 ”diagnosis overrun” is set in the station status 3.
Tip: If you disable the interrupts for the ET 200M during parameter assignment,
there are still up to 20 additional bytes available in the interrupt section for the
channel-specific diagnosis (see also Figure 5-8).