Pepperl+Fuchs FD0-VC-Ex4.FF Manual page 26

Within the DI function block, the value of the parameter "FIELD_VAL_D" is assigned to the parameter
"PV_D" and from there to the parameter value of "OUT_D". Thus cyclic transmission of all 8 PFC sensor
values to a DCS is possible as well as making further use of them in a function block application.
Because of the many inputs mapped to a single parameter the status does not reflect the status
of a specific input any more. So failures as lead breakage or short circuit of the sensor wires are
no longer signaled using the status. The status will be always "Good". Only hardware failures of
the VC device will be shown as a status of "Bad - Device Failure".
Using the parameter PV_FTIME, you can determine for how long (in seconds) the PFC sensor
values have to be stable before they are passed on from the parameter FIELD_VSL_D to the
parameter PV_D.
Depending on the application used, PFC sensor values can keep changing and/or influence one
another. In such a case, an inappropriate numeric value can result in the parameter PV_D not
being updated at all.
This is why Pepperl+Fuchs recommends setting the parameter PV_FTIME to 0.
If time monitoring is not necessary, Pepperl+Fuchs recommends setting the parameter "Sensor
usage" to "Use sensor values for PV_D".
Subject to reasonable modifications due to technical advances.
26
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Parameterisation and operation of the valve coupler
Function blocks
DI function block
1100, 40 ms
Transducer blocks
Fieldbus Valve Coupler FD0-VC-Ex4.FF
Copyright Pepperl+Fuchs, Printed in Germany