A1-6 faqs, A1-6 faqs -8 – Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer User Manual

Page 86

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5-8 APPENDIX 1. LINK MASTER FUNCTIONS

IM 12A00A01-61E

(14) dlmeScheduledescriptor
This parameter exists for the same number as
the total number of domains, and each describes
the LAS schedule downloaded to the correspond-
ing domain. For the domain to which a schedule
has not yet been downloaded, the values in this
parameter are all zeros.

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

(15) domain
Read/write: impossible; get-OD: possible
Carrying out the GenericDomainDownload com-
mand from a host writes an LAS schedule to the
domain.

A1-6 FAQs
Q1.

When the LAS stops, a EXA202 does not
back it up by becoming the LAS. Why?

A1-1. Is that EXA202 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 fol-
lowing condition is met:

EXA202

Other LMs

V(ST) 3 V(TN)

<

V(ST) 3 V(TN)

Q2.

How can I make a EXA202 become the
LAS?

A2-1. Check that the version numbers of the active

schedules in the current LAS and the EXA202
are the same by reading:

LinkScheduleListCharacteristicsRecord
(index 374 for a EXA202)

- ActiveScheduleVersion (subindex 3)

A2-2. Make the EXA202 declare itself as and be-

come the LAS by writing:

• 0x00 (false) to PrimaryLinkMasterFlagVari-

able in the current LAS; and

• 0xFF (true) to PrimaryLinkMasterFlagVari-

able (index 364) in the EXA202.

Q3.

On a segment where a EXA202 works as
the LAS, another device cannot be con-
nected. Why?

A3-1. Check the following bus parameters that indi-

cate the bus parameter as being the LAS for
the EXA202 and the capabilities of being the
LAS for the device that cannot be connected:

• V(ST), V(MID), and V(MRD) of EXA202:

ConfiguredLinkSettingsRecord (index 369)

• V(ST), V(MID), and V(MRD) of problematic

device: DlmeBasicInfo

Then, confirm that the following conditions are
met:

EXA202

Problematic Device

V(ST)

>

V(ST)

V(MID)

>

V(MID)

V(MRD)

>

V(MRD)

A3-2. Check that the node address of the problem-

atic device does not lie within either 0x00 to
0x10 or the range of unused (unpolled) node
addresses determined by the EXA202’s LM
parameter settings, which is 0x00 to 0x10 or
V(FUN) to V(FUN) + V(NUM). (Refer to Sec-
tion 3-3-2, “Network Definition.”)

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