Yokogawa EJA115 - Manual (Page 28)

IM 01C22T02-01E 5-6
5. CONFIGURATION
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
T0508.EPS
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 EJA 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.
Five trend objects are factory-set as shown Table 5.9.
Table 5.9 Trend Object are Factory-Set
T0509.EPS
Index Parameters Factory Settings
32000 Not used. TREND_FLT.1
32001 Not used. TREND_FLT.2
32002 Not used. TREND_FLT.3
32003 Not used. TREND_FLT.4
32004 Not used. TREND_DIS.1
F0505.EPS
SMIB
(System
Management
Information
Base)
NMIB
(Network
Management
Information
Base)
AI1 OUT AI2 OUT
FBOD
Alert
Trend
VCR
DLSAP
DLCEP
Fieldbus Cable
EJA
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
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
VIEW_2
VIEW_3
VIEW_4
Set of all the dynamic parameters.
Description
Set of dynamic parameters required by operator
for plant operation. (PV, SV, OUT, Mode etc.)
Set of static parameters which need to be
shown to plant operator at once. (Range etc.)
Set of static parameters for configuration or
maintenance.
T0510.EPS
Table 5.11 View Object for Resource Block
T0511-1.EPS
1 ST_REV 2
2 TAG_DESC
3 STRATEGY
4 ALERT_KEY
5 MODE_BLK 4
6 BLOCK_ERR 2
7 RS_STATE
8 TEST_RW
9 DD_RESOURCE
10 MANUFAC_ID
2 2
4
2
1 1
2
2
1
4
VIEW
1
VIEW
2
VIEW
3
VIEW
4
Relative
Index
Parameter Mnemonic