Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 120)

<APPENDIX 7. LINK MASTER FUNCTIONS>
A7-3
IM 01F06F00-01EN
(3) In the LAS settings of the digitalYEWFLO,
set the values of V(FUN) and V(NUN) so
that they include the node addresses of all
nodes within the same segment. (Refer to
Figure A7.3.)
Confi guredLinkSettingsRecord
(digitalYEWFLO Index 369 (SM))
Subindex Element
Default
Value
Description
4 FirstUnpolledNodeId 0x25 V (FUN)
7 NumConsecUnpolledNodeId 0xBA V (NUN)
A7.4 LM Functions
No. Function Description
1 LM initialization When a fi eldbus segment starts, the
LM with the smallest [V(ST) × V(TN)]
value within the segment becomes
the LAS. At all times, each LM is
checking whether or not a carrier is
on the segment.
2 Startup of
other nodes
(PN and Node
Activation SPDU
transmissions)
Transmits a PN (Probe Node)
message, and Node Activation
SPDU message to devices which
return a new PR (Probe Response)
message.
3 PT transmission
(including fi nal bit
monitoring)
Passes a PT (Pass Token) message
to devices included in the live list
sequentially, and monitors the RT
(Return Token) and fi nal bit returned
in reply to the PT.
4 CD transmission Transmits a CD (Compel Data)
message at the scheduled times.
5 Time
synchronization
Supports periodic TD (Time
Distribution) transmissions and
transmissions of a reply to a CT
(Compel Time).
6 Domain download
server
Sets the schedule data. The
schedule data can be equalized
only when the Domain Download
command is carried out from outside
the LM in question. (The version of
the schedule is usually monitored,
but no action takes place, even
when it changes.)
7 Live list equalization Transmits SPDU messages to LMs
to equalize live lists.
8 LAS transfer Transfers the right of being the LAS
to another LM.
9 Reading/writing of
NMIB for LM
Refer to APPENDIX 7.5 “LM
Parameters.”
10 Round Trip Delay
Reply (RR)
Reply to DLPDU
Not yet supported in the current
version.
11 Long address Not yet supported in the current
version.