12 Discrete Output Function Block Proline Prowirl 72 FOUNDATION Fieldbus
120 Endress + Hauser
Input assignment of the CAS_IN_D, RCAS_IN_D, OUT_D, SP_D parameters
Example for controlling positive zero return via the Discrete Output Function Block
The following example is intended to illustrate how positive zero return can be activated and
deactivated during a rinsing process by an upstream function block via the Discrete Output Function
Block.
1. First of all, the connection between the Discrete Output Function Block and the Transducer
Blocks must be established. For this purpose, the value "16" (= Discrete Output) has to be
assigned to the CHANNEL parameter.
2. By means of the SHED_OPT parameter, select the response in the event of the monitoring time
being exceeded (SHED_OPT) in the RCAS operating mode.
! Note!
The option SHED_OPT = 0 (uninitialized) is not valid.
3. Download all the data and parameters into the field device.
In the CAS operating mode, the Discrete Output Function Block processes the set point specified by
an upstream function block at the CAS_IN_D input and transmits this to the Transducer Blocks.
Switching on positive zero return
Starting from the output value 0 (Discrete state 0), positive zero return is switched on through a
change in state from 0 2 at the CAS_IN_D input.
Switching off positive zero return:
Positive zero return can only be switched off again if the input value at CAS_IN_D is set to the
output value 0 (Discrete state 0) beforehand. Only then can positive zero return be switched off by
a change in state from 0 3 at the CAS_IN_D input.
Status change Action
Discrete state 0 Discrete state 1 Reserved
Discrete state 0 Discrete state 2 Positive zero return ON
Discrete state 0 Discrete state 3 Positive zero return OFF
Discrete state 0 Discrete state 4 Reserved
Discrete state 0 Discrete state 5 Reserved
Discrete state 0 Discrete state 6 Reserved
Discrete state 0 Discrete state 7 Reserved
Discrete state 0 Discrete state 8 Reset totalizer
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