YOKOGAWA Dpharp EJX910A, Руководство пользователя

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IM 01C25R03-01E A-59
APPENDIX 6. 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
TA0214.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 EJX910A,
maximum allowable linkages between devices
are 18.
A6.6 FAQs
Q1. When the LAS stops, an EJX910A does not
back it up by becoming the LAS. Why?
A1-1. Is that EJX910A 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:
EJX Other LMs
V(ST) V(TN) < V(ST) V(TN)
Q2. How can I make an EJX910A become the
LAS?
A2-1. Check that the version numbers of the active
schedules in the current LAS and the EJX910A
are the same by reading:
LinkScheduleListCharacteristicsRecord (index
374 for an EJX910A)
- ActiveScheduleVersion (subindex 3)
A2-2. Make the EJX 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 EJX910A.
Q3. On a segment where an EJX910A 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 EJX910A and the capabilities of being the
LAS for the device that cannot be connected:
• V(ST), V(MID), V(MRD) of EJX910A:
ConfiguredLinkSettingsRecord (index 369)
• V(ST), V(MID), V(MRD) of problematic
device: DlmeBasicInfo
Then, confirm that the following conditions are
met:
EJX910A 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 EJX910A.
Q4. “AL.20” is kept shown on LCD.
The LAS does not exist or is not identified in the
fieldbus network, or the EJX910A is not able to
establish communication with the LAS.
A4-1. Check that the LAS is connected on the net-
work. When using the EJX910A as the LAS,
follow the steps described in section A6.3.
A4-2. Adjust the parameters of the LAS to that of the
EJX910A. Refer to section 5.2 for details.
LAS EJX910A
V(ST) > V(ST) 4 or above
V(MID) > V(MID) 4 or above
V(MRD) > V(MRD) 12 or above
A4-3. Check that the correct Node Address is used for
the EJX910A. Refer to section 5.2 for details.
Confirm that the Node Address of EJX910A
should be out of the parameters of the LAS of V
(FUN)
⬃
V (FUN) V (NUN)
Confirm that the Node Address is not within the
default address (0xF8 to 0xFB).