Yokogawa YVP110 - Manual (Page 131)

<Appendix 2. Link Master Functions>
A-20
IM 21B04C01-01E
To set up a YVP as a device that is capable of
backing up the LAS, follow the procedure below.
NOTE: When changing the settings in a YVP, add
the YVP to the segment in which an LAS is
running. After making changes to the settings,
do not turn off the power to the YVP for at least
60 seconds.
(1) Set the node address of the YVP. In general,
use an address from 0x10 to [V(FUN) - 1].
Bridge device
Not used
LM device
Not used
Basic device
Default address
Portable-device address
V (FUN)
V (FUN) + V (NUN)
V (NUN)
0xFF
0xFD
0xFC
0xF8
0xF7
0x14
0x13
0x0F
0x10
0x00
FA0203.ai
Figure 3. Node Address Ranges
(2) In the LAS settings of the YVP, set the values
of V(ST), V(MRD), and V(MID) to the same as
the respective lowest capability values in all
the devices within the segment. An example is
shown below.
DlmeBasicInfo (YVP Index 361 (SM))
Sub-
index
Element EJA Device
1
Device
2
Device
3
Description
1
SlotTime
4 8 10 20
Capability
value for V
(ST)
3
MaxResponse
Delay 3 6 3 5
Capability
value for V
(MRD)
6
MinInterPdu
Delay 4 8 12 10
Capability
value for V
(MID)
In this case, set SlotTime, MaxResponseTime,
and MinInterPduDelay as follows:
ConfiguredLinkSettingsRecord (YVP Index 369 (SM))
Subindex Element
Setting
(Default)
Description
1 SlotTime 20 (4095) V (ST)
3 MaxResponseDelay 6 (5) V (MRD)
6 MinInterPduDelay 12 (12) V (MID)
(3) In the LAS settings of the YVP, 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 3.)
ConfiguredLinkSettingsRecord (YVP Index 369 (SM))
Sub-
index
Element
Default
Value
Description
4 FirstUnpolledNodeId 0x25 V (FUN)
7 NumConsecUnpolledNodeId 0xBA V (NUN)
A2.4 LM Functions
No. Function Description
1 LM initialization 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.
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 final bit
monitoring)
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.
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
See Section A2.5.
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.