Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 23)

<5. CONFIGURATION>
5-6
IM 01F06F00-01EN
5.6 Block Setting
Set the parameter for function block VFD.
5.6.1 Link Objects
A link object combines the data voluntarily
sent by the function block with the VCR. Each
digitalYEWFLO has 40 link objects. A single link
object specifi es one combination. Each link object
has the parameters listed in Table 5.6. Parameters
must be changed together for each VCR because
the modifi cations 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 the digitalYEWFLO.
Set to “0”.
4 ServiceOperation Set one of the following. Set
only one each for link object for
Alert or Trend.
0: Undefi ned
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.
Link objects are not factory-set. Set link objects as
shown in Table 5.7.
Table 5.7 Settings of Link Objects (example)
Index Link Object # Settings(example)
30000 1 AI. OUT VCR#6
30001 2 Trend VCR#5
30002 3 Alert VCR#7
30003 to 30039 4 to 40 No used
5.6.2 Trend Objects
It is possible to make settings so that a function
block automatically transmits the trend. For this,
each digitalYEWFLO has ten trend objects: eight
for trends of analog parameters and two for discrete
parameters. For each trend object, specify a single
parameter, the trend of which is to be transmitted.
Each trend object has the parameters listed in
Table 5.8. For the fi rst four parameters, setting is
mandatory. Before writing parameter settings to
a trend object, parameter WRITE_LOCK of the
resource block must be modifi ed to unlock the
write-lock.
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. In the digitalYEWFLO,
the following three types of
trends are possible.
7: PV
8: OUT
19: FIELD_VAL
3 Sample Type Specifi es 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 Specifi es 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.
Ten trend objects are not factory-set.
Table 5.9 Trend Objects
Index Parameter Factory Setting
32000 to
32007
TREND_FLT.1 to
TREND_FLT.8 Not set.
32008 TREND_DIS.1 Not set (these parameters
are used with a DI block or
optional PID block).
32009 TREND_DIS.2