Yokogawa EJX930A - Manual (Page 33)

<5. Configuration>
5-6
IM 01C25R03-01E
Table 5.6 Link Object Parameters
Sub-
index
Parameter 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 EJX. 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.
Set link objects as shown in Table 5.7.
Table 5.7 Factory-Settings of Link Objects
(example)
Index Link Object # Factory Settings
30000 1 AI1.OUT → VCR#6
30001 2 Trend → VCR#5
30002 3 Alert → VCR#7
30003 4 AI2.OUT → VCR#9
30004
to
30039
5 to 40 Not used
5.6.2 Trend Object
It is possible to set the parameter so that the
function block automatically transmits Trend. EJX
multivariable transmitter has seven Trend objects,
six of which are used for Trend in analog mode
parameters and one 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. Before writing to a Trend object, it is
necessary to release the WRITE_LOCK parameter.
Table 5.8 Parameters for Trend Objects
Sub-
index
Parameter 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 EJX
AI block, the following three
types of trends are possible.
7: PV
8: OUT
19: FIELD_VAL
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.
Seven 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.5
Not used.
32006 TREND_DIS.1 Not used.
F0505.ai
SMIB
(System
Management
Information
Base)
NMIB
(Network
Management
Information
Base)
AI1 OUT AI2 OUT
FBOD
Alert
Trend
VCR
DLSAP
DLCEP
Fieldbus Cable
EJX
0xF8 0xF3 0xF4 0xF7 0xF9 0x20 0x21 0x07
#1 #2 #3 #4
Resource
block
Transducer
block
Host 1 Host 2 Device 1 Device 2
Link
object
#1 #2 #3 #4 #5 #6 #7 #8 #9
Figure 5.5 Example of Default Configuration