Block Setting; Link Objects; Trend Objects - YOKOGAWA digitalYEWFLO Series User Manual

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 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-
Parameters
index
1 LocalIndex
2 VcrNumber
3 RemoteIndex
4 ServiceOperation
5 StaleCountLimit
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 #
30000 1
30001 2
30002 3
30003 to 30039 4 to 40
Description
Sets the index of function block
parameters to be combined; set
"0" for Trend and Alert.
Sets the index of VCR to be
combined. If set to "0", this link
object is not used.
Not used in the digitalYEWFLO.
Set to "0".
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
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.
Settings(example)
AI. OUT VCR#6
Trend VCR#5
Alert VCR#7
No used
<5. CONFIGURATION>

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 first four parameters, setting is
mandatory. Before writing parameter settings to
a trend object, parameter WRITE_LOCK of the
resource block must be modified to unlock the
write-lock.
Table 5.8 Parameters for Trend Objects
Sub-
Parameters
index
1 Block Index
2 Parameter Relative
Index
3 Sample Type
4 Sample Interval
5 Last Update
6 to 21 List of Status
21 to 37 List of Samples
Ten trend objects are not factory-set.
Table 5.9 Trend Objects
Index Parameter
32000 to TREND_FLT.1 to
32007 TREND_FLT.8
32008 TREND_DIS.1
32009 TREND_DIS.2
5-6
Description
Sets the leading index of the
function block that takes a
trend.
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
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.
Specifies sampling intervals in
units of 1/32 ms. Set the integer
multiple of the function block
execution cycle.
The last sampling time.
Status part of a sampled
parameter.
Data part of a sampled
parameter.
Factory Setting
Not set.
Not set (these parameters
are used with a DI block or
optional PID block).
IM 01F06F00-01EN