Varec 8300 series, Инструкция по установке и эксплуатации, Страница: 75 / 150

8303
Varec, Inc. 65
5.7 MTG Tank Gauge Interface (MG5000)
The MG5000 Tank Gauge point provides an interface to a MTS Magnetostrictive Tank
Gauge (MTG) that uses the Modbus protocol. The MTS MTG consist of
magnetostrictive level and RTD temperature sensors providing highly accurate
digital output data. This data is transmitted over an EIA-485 communication data
bus which allows multi-drop connection, eliminating the requirement for individual
cable runs to each gauge.
The MG5000 point provides product level, product water interface level, and temperature data,
as well as gauge status information. Configuration and diagnostic information is also available
from the MG5000, and can be modified if necessary.
The MG5000 point can execute on the Model 8203 Dual RS-485 Interface Module. The Model
8203 provides 2 EIA-485 data busses which can interface to a maximum of 16 MTS MTG gauges
per bus. A MG5000 point is needed for each tank being monitored.
To use this point, you must have a Tank Gate Interface with the Model 8203 Dual RS-485
Interface Module with MDTGx_xx series firmware, version MDTG1_10 or later.
5.7.1 Parameters
The database parameters used by the MG5000 point are listed and described below:
i
Configuration Parame-
ters Function
Tag A Tag can contain 15 bytes of data and can include any printable ASCII
character. Tags can be used to identify the name of the tank being monitored
The default tag is set to the number, i.e., point 0 = “MG5000.00”.
Description The point description can contain 30 bytes of data and can include any printable
ASCII character. Descriptions can be used as information relevant to any aspect
of the point, such as its use, location, operating information, etc. The default
description is set to “MG5000.00”
Chan 8203 channel.
ID Physical Address (0x01-0xF7) [decimal equivalent 1 - 274]. The default is 0xF7.
LevelUnits Specifies the engineering units for the level data.
F: feet
m: Millimeters
M: Meters
I: Inches
The LevelUnits needs to match the units specified during the gauge setup. The
Level can be converted from Metric to English (or vice-versa) by setting the
LevelConvert parameter in the appropriate MSCAN or RKSCN point.
LevelConvert Determines the units in which the level data will be displayed.
F: Feet
M: Meters
Default is F.
TempUnits Specifies the engineering units for the temperature data.
F: Fahrenheit
C: Celsius
The TempUnits needs to match the units specified during the gauge setup. The
Temp can be converted from Metric to English (or vice-versa) by setting the
TempConvert parameter in the appropriate MSCAN or RKSCN point.