Trend Object; View Object - YOKOGAWA vigilantplant EJA Series User Manual

5.6.2 Trend Object

It is possible to set the parameter so that the function
block automatically transmits Trend. EJA has five
Trend objects, four 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-
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
Five trend objects are factory-set as shown Table 5.9.
Table 5.9 Trend Object are Factory-Set
Index Parameters
32000 TREND_FLT.1
32001 TREND_FLT.2
32002 TREND_FLT.3
32003 TREND_FLT.4
32004 TREND_DIS.1
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 EJA AI block,
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.
T0508.EPS
Factory Settings
Not used.
Not used.
Not used.
Not used.
Not used.
T0509.EPS
SMIB
(System
Resource
Management
block
Information
Base)
NMIB
(Network
Management
Information
Base)
Link
object
#1
VCR #2
DLSAP
0xF8 0xF3 0xF4 0xF7 0xF9 0x20 0x21 0x07
DLCEP
Fieldbus Cable
Host 1
Figure 5.5 Example of Default Configuration

5.6.3 View Object

This object forms group of parameters in a block. One
advantage brought by forming groups of parameters is
the reduction of load for data transaction. EJA has four
View Objects for each Resource block, Transducer
block and AI1.AI2 function block, and each View
Object has the parameters listed in Table 5.11 to 5.13.
Table 5.10 Purpose of Each View Object
VIEW_1
Set of dynamic parameters required by operator
for plant operation. (PV, SV, OUT, Mode etc.)
VIEW_2
Set of static parameters which need to be
shown to plant operator at once. (Range etc.)
VIEW_3 Set of all the dynamic parameters.
VIEW_4 Set of static parameters for configuration or
maintenance.
Table 5.11 View Object for Resource Block
Relative
Parameter Mnemonic
Index
1 ST_REV
2 TAG_DESC
3 STRATEGY
4 ALERT_KEY
5 MODE_BLK
6 BLOCK_ERR
7 RS_STATE
8 TEST_RW
9 DD_RESOURCE
10 MANUFAC_ID
5-6
5. CONFIGURATION
Transducer
AI1 OUT AI2 OUT
block
FBOD
#1 #4 #3
#3 #4 #8 #6 #9 #7
Device 1
Host 2 Device 2
Description
VIEW VIEW VIEW
1 2 3
2 2 2
4 4
2 2
1 1
IM 01C22T02-01E
Alert
Trend
#2
#5
F0505.EPS
T0510.EPS
VIEW
4
2
2
1
4
T0511-1.EPS