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Attention
For PDCs that are configured as NI or NO module, CEAGDSB performs the following processing.
• Updates the CHDATARAW parameter for INT32.
Channel Error Processing
The channel error status generated is delivered with the raw data. The error status bits are picked from the raw
data and used as the information while generating the channel status and channel alarms. The channel error is
transmitted only if the error reporting for the channel is allowed using the field network configuration.
Attention
The channel errors are transmitted for the analog values only if the range values are set to default (Low = 10000 and
High = 50000) in the field network configuration.
Extended Diagnostics
The extended diagnostics message contains the communication module diagnostic data and module status,
which are used for generating the CEAGDSB alarms. The additional module status information is used to
produce the channel status parameter of the PDC.
The following table lists the various module status values and a brief description of the state.
Module Status Description
Data valid This is the normal module status when there are no errors.
Module error This state indicates that one or more channel error is active in the module. This state is applicable only to
the channels that are configured to allow channel error reporting in the Field Network Configuration.
Wrong module This state indicates that the module type in the slot conflicts with the module type defined in Field
Network Configuration.
Missing module This state indicates that the module is physically not present in the configured slot.
Tip
You can view the diagnosis and extended diagnosis of the devices online. For more information, see “Viewing the
slave device diagnosis” on page 100 and “Viewing the slave device's extended diagnosis” on page 101 respectively.
Channel and module alarms based on module status and PDC type
The following table lists the behavior of the channel and module alarms, based on the module states and the
PDC types.
Module status PDC type Channel alarms Module alarm
Missing module IN/OUT All channel alarms of module are
set to RETURNED to NORMAL. Module alarm is set to ACTIVE,
parameter = missing module (4).
Wrong module IN/OUT All channel alarms of module are
set RETURNED to NORMAL. Module alarm is set to ACTIVE,
parameter = wrong module (3).
Module error IN • Alarms of channels reporting
error are set to ACTIVE.
• Alarms of channels not
reporting error are set
RETURNED to NORMAL.
Module alarm is set to RETURNED to
NORMAL.
OUT - Module alarm is set ACTIVE,
parameter = module error (2).
Data valid IN/OUT All channel alarms of module are
set RETURNED TO NORMAL. Module alarm is set RETURNED TO
NORMAL.
7 DEVICE SUPPORT BLOCK (DSB)
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