Yokogawa RotaMASS 3-Series - Manual (Page 170)

APPENdIX 7. LINK MASTEr FUNCTIONS
a-70 IM 01R04B05-00E-E 3rd edition July 30, 2010 -00 all Rights Reserved. Copyright © 2005, Rota Yokogawa
A7.5.2 descriptions for LM Parameters
the following describes LM parameters of a
RotaMaSS transmitter.
notE: Do not turn off the power to the RotaMaSS for 60
seconds after making a change to its parameter set-
tings.
(1) dlmeLinkMasterCapabilitiesVariable
Meaning
Bit
Position
Value Description
1
0
0
LaS Schedule
in non-volatile
Memory
Last Values
Record
Supported
Link Master
Statistics
Record
Supported
Whether the LaS schedule can
(= 1) or cannot (= 0) be saved
to the non-volatile memory
Whether to support (= 1) or not
to support (= 0)
LastValuesRecord.
Whether to support (= 1) or not
to support (= 0)
DlmeLinkMasterStatisticsRecord.
B3: 0x04
B2: 0x02
B1: 0x01
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(2) dlmeLinkMasterInforecord
Element
Sub-
index
Descrip-
tion
Size
[bytes]
1
2
2
2
2
4
2
2
V(MSo)
V(DMDt)
V(DtHt)
V(ttRt)
V(LtHt)
V(tDP)
V(MICD)
V(LDDP)
MaxSchedulingoverhead
DefMintokenDelegtime
DeftokenHoldtime
targettokenRottime
LinkMainttokHoldtime
timeDistributionPeriod
MaximumInactivitytoClaimLasDelay
LasDatabaseStatusSpduDistributionPeriod
1
2
3
4
5
6
7
8
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(3) PrimaryLinkMasterFlagVariable
Explicitly declares the LaS. Writing “true” (0xFF)
to this parameter in a device causes that de-
vice to attempt to become the LaS. However,
a request of writing “true” to this parameter in a
device is rejected if the value of the same param-
eter in any other device that has a smaller node
address within the same segment is true.
(4) LiveListStatusArrayVariable
a 32-byte variable, in which each bit represents
the status of whether a device on the same seg-
ment is live or not. the leading bit corresponds
to the device address 0x00, and final bit to 0xFF.
the value of LiveListStatusarrayVariable in the
case where devices having the addresses 0x10
and 0x15 in the fieldbus segment is shown below.
0x00 00 84 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
Bit correspondences: 0 0 0 0 0 0 0 0 0 0 0
0x00
0 0 0 0 0 1 0 0 0 0 1 0 0...
0x10 0x15
(5) MaxTokenHoldTimeArray
an 8- by 64-byte array variable, in which each set
of 2 bytes represents the delegation time (set as
an octet time) assigned to a device. the delega-
tion time denotes a time period that is given to a
device by means of a Pt message sent from the
LaS within each token circulation cycle.
the leading 2 bytes correspond to the device
address 0x00, and the final 2 bytes to the device
address 0xFF. Specify the subindex to access
this parameter.
(6) BootOperatFunctionalClass
Writing 1 to this parameter in a device and restart-
ing the device causes the device to start as a
basic device. on the contrary, writing 2 to this
parameter and restarting the device causes the
device to start as an LM.
(7) CurrentLinkSettingrecord and Config-
uredLinkSettingsrecord
CurrentLinkSettingRecord indicates the bus pa-
rameter settings currently used. ConfiguredLink-
SettingsRecord indicates the bus parameter
settings to be used when the device becomes the
LaS. thus, when a device is the LaS, its Cur-
rentLinkSettingRecord and ConfiguredLinkSetting-
sRecord have the same values.
Element
Sub-
index
Descrip-
tion
Size
[bytes]
2
1
1
1
2
1
1
1
1
1
1
V(St)
V(PhLo)
V(MRD)
V(Fun)
V(tL)
V(MID)
V(nun)
V(PhPE)
V(PhGE)
V(PhIS)
V(tSC)
Slottime
PerDlpduPhloverhead
MaxResponseDelay
FirstunpollednodeId
thisLink
MinInterPduDelay
numConsecunpollednodeId
PreambleExtension
PosttransGapExtension
MaxInterChanSignalSkew
timeSyncClass
1
2
3
4
5
6
7
8
9
10
11
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