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3. Fieldbus Integration With Experion System
3.5. Tags, Addresses, and Live List
Node
Addresses:
0
10
Hexadecimal
0
16
Decimal
Standard, Global,
and Flat Node
Addresses
Figure 13 Summary of address allocations for fieldbus devices
ATTENTION
Temporary devices such as handheld interfaces are not assigned tags or
addresses. They join the network through one of four data link visitor
addresses reserved for them in the data link layer protocol.
Note that the Experion system will show address assignments in Decimal
notation rather than Hexadecimal in Control Builder configuration forms and
Station displays. The address range in Decimal is 0 to 255 and 0 to FF in
Hexadecimal.
A word about fieldbus address assignments in Control Builder
The Fieldbus Interface Module will be given 16 as its assigned address. The preferred
address range for fieldbus devices is 20 to 40 decimal (14 to 28 hexadecimal). This
provides the most optimized default network range where the first unused node address
(FUN) is 41 decimal (29 hexadecimal) and the number of unused addresses (NUN) is
206. We recommend that the fieldbus device designated as the backup Link Master be
given 21 decimal (15 hexadecimal) as its assigned address.
Live List and Uncommissioned Devices
F
Fieldbus defines a live list as a 32-byte bitstring (256 bits) where each bit
OUNDATION
represents an address of the fieldbus network. A set bit at a particular bit number means
that a device is present at that address. The LAS of the network owns the live list and
maintains it as part of its operation.
70
Experion PKS Series A Fieldbus Interface Module User's Guide
Number of
First Unused
Unused Node
Node Address
Addresses
V(FUN)
V(NUN)
X
X
Usable
Addresses
Honeywell
Non-Visitor addresses,
used as default
addresses for devices
Visitor addresses
used for temporary
requiring address
assignments
(handheld) devices
Y
F8
FB FC
248
251 252
Y
Usable Addresses
FF
255
R400
July 2010
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