Proline Prowirl 72 FOUNDATION Fieldbus 12 Discrete Output Function Block
Endress + Hauser 119
12 Discrete Output Function Block
The Discrete Output Function Block (DO) processes the discrete set point received from an
upstream function block or higher-level process control system which can be used to trigger various
device functionalities (e.g. totalizer reset) in the downstream Transducer Blocks.
A0003816-EN
Fig. 37: Example for Discrete Output Function Block
CAS_IN _D = External input value and status from an upstream block
OUT_D = Discrete output value and status
BKCAL_OUT_D = Output value and status for the BCAL_IN_D input of another block
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Note!
For a description of the most important parameters and functions of the Discrete Output Function
Block, refer to the Operating Instructions "FOUNDATION Fieldbus Overview" (BA013S). Available
at: www.endress.com Download.
The most important parameter settings of the Discrete Output Function Block are listed below.
12. 1 Assignment: Discrete Output Function
Block/Transducer Blocks
The assignment or connection between the Discrete Output Function Block and the Transducer
Blocks is established by means of the CHANNEL parameter (option "16" = Discrete Output Function
Block).
12. 2 Values for the CAS_IN_D, RCAS_IN_D, OUT_D, and
SP_D parameters
By means of the Discrete Output Function Block, various device functionalities can be triggered in
the Transducer Blocks in question via manufacturer-specific, specified set points from an upstream
function block.
Here, you must note that the desired function is not executed until a change of state from the
value 0 (Discrete state 0) to the corresponding function value takes place (Page 120). Thus, the
value = 0 always serves as the starting point for triggering the device functions. A change of status
from a value other than 0 to another value does not have any effect.
OUT_D
BKCAL_OUT_D
CAS_IN_D
DO
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