Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 19)

<5. Configuration>
5-6
IM 01C50T02-01E
5.6 Block Setting
Set the parameter for function block VFD.
5.6.1 Link Object
Link object combines the data voluntarily sent
by the function block with VCR. YTA has 26
link objects. A single link object specifies one
combination. Each link object has the parameters
listed in Table 5.6.
Parameters must be changed together for each
VCR because the modifications made to each
parameter may cause inconsistent operation.
Table 5.6 Link Object Parameters
Sub-
index
Parameters Description
1 LocalIndex Sets the index of function
block parameters to be
combined; set “0” for Trend
and Alert.
2 VcrNumber Sets the index of VCR to be
combined. If set to “0”, this
link object is not used.
3 RemoteIndex Not used in YTA.Set to “0”.
4 ServiceOperation Set one of the following. Set
only one each for link object
for Alert or Trend.
0: Undefined
2: Publisher
3: Subscriber
6: Alert
7: Trend
5 StaleCountLimit Set the maximum number
of consecutive stale input
values which may be
received before the input
status is set to BAD. To
avoid the unnecessary
mode transition caused
when the data is not
correctly received by
subscriber, set this
parameter to “2” or more.
26 Link objects are not factory-set.
5.6.2 Trend Object
It is possible to set the parameter so that the
function block automatically transmits Trend. YTA
has ten Trend objects, six of which are used for
Trend in analog mode parameters and four is used
for Trend in discrete mode parameter. A single
Trend object specifies the trend of one parameter.
Each Trend object has the parameters listed in
Table 5.8. The first four parameters are the items to
be set.
Table 5.8 Parameters for Trend Objects
Sub-
index
Parameters Description
1 Block Index Sets the leading index of the
function block that takes a
trend.
2 Parameter
Relative Index
Sets the index of parameters
taking a trend by a value
relative to the beginning of
the function block.
3 Sample Type Specifies how trends are
taken. Choose one of the
following 2 types:
1: Sampled upon execution
of a function block.
2: The average value is
sampled.
4 Sample Interval Specifies sampling intervals
in units of 1/32 ms. Set
the integer multiple of the
function block execution
cycle.
5 Last Update The last sampling time.
6 to
21
List of Status Status part of a sampled
parameter.
21 to
37
List of Samples Data part of a sampled
parameter.
Five trend objects are factory-set as shown Table
5.9.
Table 5.9 Trend Object are Factory-Set
Index Parameters Factory Settings
32000
to
32005
TREND_FLT.1
to
TREND_FLT.6
Not used.
32006
to
32010
TREND_DIS.1
to
TREND_DIS.4
Not used.