Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 81)

APPENDIX 1. LINK MASTER FUNCTIONS 5-3
IM 12A00A01-61E
(3) In the LAS settings of the EXA202, set the
values of V(FUN) and V(NUN) so that they
include the node addresses of all nodes within
the same segment. (See also Figure A1-3.)
Subindex Element
ConfiguredLinkSettingsRecord
(EXA202 Index 369 (SM))
Description Default Value
V (FUN)
V (NUN) 0x25
0xBA FirstUnpolledNodeId
NumConsecUnpolledNodeId 4
7
A1-4 LM Functions
No. Function Description
LM initialization
Startup of other
nodes (PN and
Node Activation
SPDU
transmissions)
PT transmission
(including final bit
monitoring)
CD transmission
Time synchronization
Domain download
server
Live list equalization
LAS transfer
Reading/writing of
NMIB for LM
Round Trip Delay
Reply (RR)
Reply to DLPDU
Long address
1
2
3
4
5
6
7
8
9
10
11
When a fieldbus 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.
Transmits a PN (Probe Node)
message, and Node Activation
SPDU message to devices which
return a new PR (Probe Response)
message.
Passes a PT (Pass Token)
message to devices included in the
live list sequentially, and monitors
the RT (Return Token) and final bit
returned in reply to the PT.
Transmits a CD (Compel Data)
message at the scheduled times.
Supports periodic TD (Time
Distribution) transmissions and
transmissions of a reply to a CT
(Compel Time).
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.)
Transmits SPDU messages to LMs
to equalize live lists.
Transfers the right of being the LAS
to another LM.
See Section A1-5.
Not yet supported in the current
version.
Not yet supported in the current
version.