User manual

5-4
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
By choosing Parameterize..., you can influence the start-up characteristics
of the DP/ASi link. You can differentiate between ”actual is equal to setpoint
configuration” and ”actual is less than or equal to setpoint configuration”.
By actual configuration we mean the actual configuration of the ASi as de-
tected by the DP/ASi link.
By setpoint configuration we mean the configured configuration of the ASi
as stored in the DP master.
”Actual is equal to setpoint configuration” means that the DP/ASi link starts
up only when the actual configuration is identical with the setpoint configu-
ration. If there is a discrepancy between the actual and setpoint configura-
tions, the DP/ASi link requests a new parameterization message.
”Actual is less than or equal to setpoint configuration” means that the DP/
ASi link compares the actual configuration with the setpoint configuration. If
the DP/ASi link establishes a discrepancy, it reacts in two different ways:
 If the DP/ASi link detects unconfigured ASi slaves, it behaves as for ”ac-
tual is equal to setpoint configuration”, that is, the DP/ASi link does not
start up.
 If a comparison of the actual and setpoint configurations determines that
configured ASi slaves are missing, the non-existent ASi slaves are repor-
ted to have failed in the diagnosis. Data exchange is initiated, however.
If the setpoint and actual configurations are identical, the DP/ASi link starts
without issuing an error message. If the actual and setpoint configurations are
not identical, a diagnosis is generated (refer to Chapter 8).
By pressing the Hex... button, you can view the parameterization table of the
DP/ASi link. The structure of this table is described in Appendix C.
You can later add more ASi slaves to the DP/ASi link or remove them later.
To do this, select the corresponding DP/ASi link from the master system con-
cerned.
Parameterize
Actual
configuration
Setpoint
configuration
Actual equal to
setpoint
configuration
Actual less than or
equal to setpoint
configuration
Hex...
Re-configuring
Configuring the DP/ASi Link