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Supervision and Data acquisition tools. |
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General
Description
The Arian instruments send continuouslly data (e.g. temperatures,
counts, positions of valves) to a PC by means of a single
wire pair across the plant.
Having in the PC a continuous historical data registry
makes possible to generate automatically production reports.
Derived benefits will be improvements in the productivity,
cost reduction and a superior quality control.
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How it works
Each instrument haves the optional RS485 isolated output
card installed.
The RS485 bus is a low cost twisted single wire pair that
connects the devices thru the plant and ends in the ISO485
interface module that converts RS485 in to galvanically
isolated RS232.
Finally the RS232 connects to a PC serial communications
port.
By other side, from the software point of view, the
instruments use the Modbus RTU protocol for exchanging
data with the PC thru the RS485 bus.
On the PC must be running the Arian Opc V4 server software
making it the Modbus arbiter that collects data from
the instruments (slaves).
Data is displayed on the software console, stored as
text files (for later processing) and presented in OPC
format to other applications executed on the same PC
or in the Net.
Such applications are typically HMI/MMI (Human Machine
Interfaces / Man Machine Interfaces) software packages
for displaying information in a friendly way.
OPC is a client-server based architecture for enabling
communication between two applications running on distributed
computers.
The OPC Data Access Specification utilizes DCOM for
communication between the OPC Client ( eg. An HMI application)
and the OPC server.
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do you need to start up communicating |
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Each of the devices must have installed
comunications option. |
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One ISO485 interface device for isolating and
controlling the RS485 bus from the PC RS232 port |
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The Arian Opc Server software (free download)
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| Technical
specifications |
| General |
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Galvanic isolation of instruments
from the bus and from the bus to the PC. |
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RS485 Half duplex (1 pair). Modbus RTU software
protocol. |
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Maximum bus length is 1200 meters. Using a twisted
pair AWG # 24. |
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Digital communications by means of RS485 serial
bus was conceived specially for industrial environments
where noise and interference immunity is required. |
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The scheme of distributed control and centralized
supervision universally is accepted as the most
reliable. When a device fails, the rest continue
operating independantly. |
| Arian OPC V4 Software |
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Run s on a X86 PC compatible computer with windows
W95, W98, W2000, XP operating system. |
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Modbus RTU bus arbiter on serial ports comm1 to
comm4 |
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OPC server under DA2 specification. |
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| Arian
S.A. El Comendador 2340, Providencia, Santiago, Chile, Phone 56-2-4218333 |
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