Yokogawa AXFA14G/C - Manual (Page 90)

IM 01E20F02-01E A-31
APPENDIX 4. LINK MASTER FUNCTIONS
Element Description
Sub-
index
Size
[bytes]
2
4
2
Indicates the version number of
the LAS schedule downloaded
to the corresponding domain.
Indicates the macro cycle of the
LAS schedule downloaded to
the corresponding domain.
Indicates the time resolution
that is required to execute the
LAS schedule downloaded to
the corresponding domain.
Version
Macrocycle
Duration
TimeResolution
1
2
3
TA0414.EPS
(15)Domain
Read/write: impossible; get-OD: possible
Carrying out the GenericDomainDownload command
from a host writes an LAS schedule to Domain.
CAUTION
When downloading a LAS schedule to AXF,
maximum allowable linkages between devices
are 18.
A4.6 FAQs
Q1. When the LAS stops, an AXF does not back
it up by becoming the LAS. Why?
A1-1. Is that AXF running as an LM? Check that the
value of BootOperatFunctionalClass (index 367)
is 2 (indicating that it is an LM).
A1-2. Check the values of V(ST) and V(TN) in all
LMs on the segment and confirm that the
following condition is met:
AXF Other LMs
V(ST)
ϫV(TN)
< V(ST)
ϫV(TN)
Q2. How can I make an AXF become the LAS?
A2-1. Check that the version numbers of the active
schedules in the current LAS and the AXF are
the same by reading:
LinkScheduleListCharacteristicsRecord (index
374 for an AXF)
- ActiveScheduleVersion (subindex 3)
A2-2. Make the AXF declare itself as and become the
LAS by writing:
• 0x00 (false) to
PrimaryLinkMasterFlagVariable in the current
LAS; and
• 0xFF (true) to
PrimaryLinkMasterFlagVariable (index 364)
in the AXF.
Q3. On a segment where an AXF works as the
LAS, another device cannot be connected.
How come?
A3-1. Check the following bus parameters that
indicate the bus parameter as being the LAS for
the AXF and the capabilities of being the LAS
for the device that cannot be connected:
• V(ST), V(MID), V(MRD) of AXF:
ConfiguredLinkSettingsRecord (index 369)
• V(ST), V(MID), V(MRD) of problematic
device: DlmeBasicInfo
Then, confirm that the following conditions are
met:
AXF Problematic
Device
V(ST) > V(ST)
V(MID) > V(MID)
V(MRD) > V(MRD)
A3-2. Check the node address of the problematic
device is not included in the V(FUN)+V(NUN)
of the AXF.