Honeywell Experion PKS User Manual page 133

Channel status processing
Channel specific diagnostics message starts from byte 13 of the extended diagnostics. In addition to the channel
status processing, the CEAGDSB applies extended channel status processing based on the module status and the
channel error bits.
Extended channel status processing
The following table lists the various channel states that a channel can assume, based on the module status and
the PDC types.
Module status PDC type
Missing module IN
OUT
Wrong module IN
OUT
Module error IN
OUT
Data valid IN
OUT
Attention
In case of a channel error, the channel value provided by the device is the last good value of the channel.
Alarm Processing
The following alarms are generated by the CEAGDSB.
• CEAGDSB internal alarms - This alarm is reported when the communication unit is not configured. This
alarm's severity is "0" and the priority is "Low."
• Alarms based on the module status - This alarm reports the slots associated with the module error. All
modules can report this alarm. This alarm's severity is "0" and the priority is "High."
• Alarms based on the channel errors - This alarm reports the slots associated with channel errors. All
modules can report this alarm. This alarm's severity is "0" and priority is "High."
Attention
The CEAGDSB cannot detect the channel error status for the output modules. Therefore, it is not useful to activate
channel-related alarms for the output modules.
• Alarms based on Communication unit diagnostics.
Channel status
Bad_DevError
Bad_DevError
Bad_ConfigError
Bad_ConfigError
Bad_SensorError
Good_NonCascade
Bad_SensorError
Good_NonCascade
GoodCasc_NonSpecific
7 DEVICE SUPPORT BLOCK (DSB)
Channels affected
All channels
All channels
All channels
All channels
Channels reporting error
Channels not reporting error
All channels
All channels
All channels
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