Endress+Hauser Proline Prosonic Flow 93 - Page 181

PROline Prosonic Flow 93 FOUNDATION Fieldbus 5 Discrete Output function block
Endress+Hauser 181
5 Discrete Output function block
The Discrete Output (DO) function block processes the discrete setpoint value received
from an upstream function block or higher-level process control system, with which
various instrument functions (e.g. zero point adjustment or totalizer reset) can be
initiated in the downstream Transducer Blocks.
5.1 Signal processing
The figure shows the internal structure of the Discrete Output function block of PROline
Prosonic Flow 93 FOUNDATION Fieldbus:
Fig. 4: Signal processing in the Discrete Output function block
In the CAS (cascade operation) operating mode, the Discrete Output function block
receives, via the CAS_IN_D function block input, a discrete signal from an upstream
function block. This signal controls the setpoint value (SP_D parameter) of the function
block and, after internal calculation, is sent as an output signal (OUT_D parameter) to
the Transducer Blocks for control of instrument functions (e.g. zero point adjustment).
The output value and status of the Discrete Output function block is communicated to
the upstream block via the BKCAL_OUT_D output.
CAS_IN_D = Remote input value and status from an upstream block
OUT_D = Discrete output value and status
BKCAL_OUT_D = Output value and status for the BKCAL_IN_D input of another block.
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RCAS_IN_D
IO_OPTS
SIMULATE_D SIMULATE_D
Discrete
Input
Transducer Blocks
Discrete
Output
MODE_BLK
CAS_IN_D
PV_D
BKCAL_OUT_D
OUT_D
(Mode Man)
(Mode Auto)
SP_D
Discrete Output Function Block
Invert.
RCAS_OUT_D
(Mode CAS)
(Mode RCAS)
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