SMAR LD292, Руководство по эксплуатации, техническому обслуживанию и инструкциям

Страница: 25 / 76

Section 3
3.1
CONFIGURATION
One of the many advantages of Fieldbus is that device configuration is independent of the
configurator. The
LD292 may be configured by a third party terminal or operator console. Any
particular configurator is therefore not addressed here.
This section describes the characteristics of the blocks in the
LD292 . They follow the Fieldbus
specifications, but in terms of transducer blocks, the input transducer block and display, they have
some special features on top of this.
Transducer Block
Transducer block insulates function block from the specific I/O hardware, such as sensors,
actuators. Transducer block controls access to I/O through manufacturer specific implementation.
This permits the transducer block to execute as frequently as necessary to obtain good data from
sensors without burdening the function blocks that use the data. It also insulates the function block
from the manufacturer specific characteristics of certain hardware.
By accessing the hardware, the transducer block can get data from I/O or passing control data to it.
The connection between Transducer block and Function block is called channel. These blocks can
exchange data from its interface.
Normally, transducer blocks perform functions, such as linearization, characterization, temperature
compensation, control and exchange data to hardware.
Rel.
Index
Param Mnemonic Description
1.
ST_REV Indicates the level of static data.
2.
TAG_DESC
Description of Transducer Block.
3.
STRATEGY
This parameter is not checked and processed by Transducer Block.
4.
ALERT_KEY
Number of identification in the plant.
5.
MODE_BLK Indicates the operation mode of Transducer Block.
6.
BLOCK_ERR
Indicates the status associated with hardware or software in theTransducer.
7.
UPDATE_EVT
It is the alert for any static data.
8.
BLOCK_ALM
It is used for configuration, hardware and others fails.
9.
TRANSDUCER_DIRECTORY It is used to select several Transducer Blocks.
10.
TRANSDUCER_TYPE
Indicates the type of Transducer according to its class.
11.
XD_ERROR
It is used to indicate calibration status.
12.
COLLECTION_DIRECTORY
Specifies the number of transducer index into Transducer Block.
13.
PRIMARY_VALUE_TYPE
Defines the calculation type for Transducer Block.
14.
PRIMARY_VALUE
It is the value and status used by channel.
15.
PRIMARY_VALUE_RANGE
The High and Low range limit values, the engineering unit code and the number of digits
to the right of the decimal point to be used for Primary Value.
16.
CAL_POINT_HI
The highest calibrated value.
17.
CAL_POINT_LO
The lowest calibrated value.
18.
CAL_MIN_SPAN
The minimum calibration span value allowed. This minimum span information is
necessary to ensure that when calibration is done, the two calibrated points (high and
low) are not too close together.
19.
CAL_UNIT
The Device Description engineering units code index for the calibration values.
20.
SENSOR_TYPE
The type of sensor.
21.
SENSOR_RANGE The range of sensor.
22.
SENSOR_SN The serial number of sensor.
23.
SENSOR_CAL_METHOD
The method of last sensor calibration. ISO defines several standard methods of
calibration. This parameter is intended to record that method, or if some other method
was used.