Honeywell Experion PKS User Manual page 155

Scenario
NetX FW reports a network down
condition.
Network is down when PGM starts
up (Warm start).
Impact on DSB load
When initial value is defined for DO and AO channel, it is possible that channel values may change
surprisingly. For example, assume that the initial value for an AO channel is defined as 90% and the slave goes
in power break condition and recovers back. In this scenario, the output value of the channel is 0 during power
break condition and changes to 90% immediately after the connection to PGM is re-established.
During DSB load, PGM sets warning level error for each channel where initial value is changed from zero to a
nonzero value. This error does not prevent loading of DSB block, but indicates that the user has configured a
feature that is rarely used in Profibus devices and may assume specific configuration setting in the slave
configuration.
The following error text appears in the Validation before load dialog box during the DSB load.
This setting will determine the output behavior of the DSB upon the return to normal following a loss of
communication with the slave. The user must ensure that the value entered will result in the minimum negative
impact on the process. Consult the user manual for more details.
Impact on AO/DO channel value in
Experion R410.2 and later
The channel values are initialized from
the user-defined values.
Clears to zero.
7 DEVICE SUPPORT BLOCK (DSB)
Impact on AO/DO channel value in
Experion R410.1 or earlier
Clears to zero.
Clears to zero.
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