A7.6 Trouble Shooting - YOKOGAWA digitalYEWFLO Series User Manual

(14) DlmeScheduleDescriptor
This parameter exists for the same number as the
total number of domains, and each describes the
LAS schedule downloaded to the corresponding
domain. For the domain to which a schedule
has not yet been downloaded, the values in this
parameter are all zeros.
Sub- Size
Element
index [bytes]
1 Version 2
2 Macrocycle 4
Duration
3 TimeResolution 2
(15) Domain
Read/write: impossible; get-OD: possible
Carrying out the GenericDomainDownload
command from a host writes an LAS schedule to
the domain.

A7.6 Trouble Shooting

Q1. When the LAS stops, a digitalYEWFLO
does not back it up by becoming the LAS.
Why?
A1-1. Is that digitalYEWFLO 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:
digitalYEWFLO
V(ST) × V(TN) <
Q2. How can I make a digitalYEWFLO become
the LAS?
A2-1. Check that the version numbers of the
active schedules in the current LAS and the
digitalYEWFLO are the same by reading:
LinkScheduleListCharacteristicsRecord
(index 374 for a digitalYEWFLO)
- ActiveScheduleVersion (subindex 3)
Description
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.
Other LMs
V(ST) × V(TN)
<APPENDIX 7. LINK MASTER FUNCTIONS>
A2-2. Make the digitalYEWFLO 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 digitalYEWFLO.
Q3. On a segment where a digitalYEWFLO
works as the LAS, another device cannot
be connected. Why?
A3-1. Check the following bus parameters that
indicate the bus parameter as being the LAS
for the digitalYEWFLO and the capabilities of
being the LAS for the device that cannot be
connected:
• V(ST), V(MID), and V(MRD) of
digitalYEWFLO:
ConfiguredLinkSettingsRecord (index
369)
• V(ST), V(MID), and V(MRD) of
problematic device: DlmeBasicInfo
Then, confirm that the following conditions
are met:
digitalYEWFLO
V(ST)
V(MID)
V(MRD)
A3-2. Check that the node address of the
problematic device does not lie within
either 0x00 to 0x10 or the range of unused
(unpolled) node addresses determined by
the digitalYEWFLO's LM parameter settings,
which is 0x00 to 0x10 or V(FUN) to V(FUN)
+ V(NUM). (Read Section 5.2 "Network
Definition.")
Q4. The LCD keeps showing "— — —". It
is presumed that an LAS does not exist
on the bus or the digitalYEWFLO cannot
establish communication with the LAS.
What should be done?
A4-1. Check that an LAS is connected on the bus.
(When using the digitalYEWFLO as the LAS
[which requires an option], perform steps (1)
to (3) in APPENDIX 7.3 "Transfer of LAS.")
A7-8
Problematic Device
> V(ST)
> V(MID)
> V(MRD)
IM 01F06F00-01EN