Configuring The Fieldbus Application; Changing The Fieldbus Polling Addresses; Changing The Slot Time - Emerson 375 User Manual

Fieldbus Functionality
CONFIGURING
THE
FIELDBUS
APPLICATION
Changing the
Fieldbus
Polling
Addresses
Changing the
Slot Time
Polling is a method of determining which devices are
present on a network. The V(FUN) is the first unpolled
node address. V(NUN) is the number of unpolled node
addresses. The addresses between V(FUN) and
V(FUN)+V(NUN)-1 are not polled. The default value for
V(FUN) is 200 and the default value for V(NUN) is zero.
Narrowing the range of devices being polled provides a
quicker Live Device List refresh.
The DeltaV System Polling checkbox instructs the 375
Field Communicator to use the same polling scheme as
DeltaV.
To change the polling addresses:
1. From the Fieldbus Application main menu, double-tap
Utility.
2. Double-tap Polling.
3. Enter addresses in the V(FUN) and V(NUN) fields and
tap OK.
From the Fieldbus Utility menu, double-tap Link
Settings. Select the default Slot Time of eight to allow
the devices to be seen on the Live Device List. It may be
necessary to change the Slot Time to 16 to view older
devices on the 375 Field Communicator Live Device
List.
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