8.4 Control output function block settings
Depending on the actual function blocks used in the application there will be different requirements for
some of the Transducer block settings. All of the Transducer block parameters are described in
section 6.2. This section shows the most popular settings that can be adopted for control of the
actuator.
The action of including the function blocks in the application declares to the LAS those instances to be
included in the exchange of information. All the available function blocks need not be added to the
application, but those not included will not provide their information to the fieldbus.
In normal operation, both the Resource and Transducer Blocks must be in Auto Mode for
control to take place.
When multistate is selected, the desired Digital Output control block also needs to be
placed in Cascade/Auto Mode.
All other DO blocks should be placed in OOS Mode.
If either the control mode and / or discrete block are modified via the Transducer
Block, it must be set to OOS prior to the modification for the changes to be
accepted. Once accepted, the Transducer Block must be returned to Auto.
In order for a configuration tool such as those supplied by SMAR, NI and Yokogawa to parameterise
the Actuator Fieldbus Card, the correct Device Definition files need to be loaded in to the configuration
environment. These files are freely available for download from www.rotork.com
The Foundation Fieldbus control of the actuator can be:
Analogue only using just position demand set-point commands.
Discrete only using just digital Open/Stop/Close commands.
Mixed Discrete/Position using both position demand set-point and digital commands.
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