Easy Cabling and Expansion with Daisy-chain Ethernet I/O
Applications
Distributed Ethernet Data Acquistion for Facilities and Environmental Monitoring in Factories

Background

In addition to using an Ethernet infrastructure, facility and environmental monitoring systems in factories have changed from a centralized PC-based architecture to distributed, larger scale systems. The host PC is now focused on monitoring and analyzing, and also hosts a graphical programming environment (SCADA) that shows real-time messages, the status of tasks, and alarms, and provides a bridge to the IT database. Sensors, gauges, and meters are now implemented far away from the central PC. Data acquisition hardware is also being moved from the central PC, which uses an I/O expansion card, to a dedicated embedded device, such as a remote Ethernet I/O product.

System Requirements

Distributed Ethernet data acquisition for facilities and environmental monitoring requires:

  1. Centralized monitoring and analysis
  2. Control and data collection in the field
  3. More remote sites, and larger coverage with Ethernet LAN/WAN connections
  4. Greater flexibility for adding, removing, and replacing remote devices
  5. Low learning curve and easy implementation
  6. Less cable required

System Description

Modern distributed facilities and environmental monitoring systems can be divided into three layers based on topology: the central SCADA system, field control, and remote sites.

Central SCADA
The central SCADA (Supervisory Control and Data Acquisition) system handles analysis and management of the information collected from remote sites. For most operations, a PC-based machine communicates with the remote devices, provides visual diagrams with the current status, handles the database connectivity bridged to another system, and is able to provide some intelligence via a programming language.
 
Field Control
Field control uses devices to handle real-time data processing, respond immediately to the current status in the field, and off load from the central SCADA system. A human-machine interface (HMI) machine is sometimes used for field monitoring.
 
Remote Sites
This is where data and information is collected from sensors. The sensors, switches, meters, and gauges are attached to a remote Ethernet I/O device that transforms a digital signal or analog waveforms to network packets, which are used for remote site control or passed back to the central SCADA system.

Moxa's ioLogik E1200 remote Ethernet I/O products play a big role in distributed Ethernet data acquisition applications. The E1200 is an external breakout box that interfaces between the signal and a PC or controller. By providing various types of input and output connections, the real-world status of different parts of a complicated system can be sampled and collected. Remote Ethernet I/O modules contains a CPU that can process the attached digital or analog data, and waits to be polled.

 

Benefits from Moxa

Moxa's ioLogik E1200 remote Ethernet I/O products optimize distributed Ethernet data acquisition applications in several different ways:

  • Built-in Ethernet switch ports save on wiring and labor costs
  • Shorter response time from remote I/O to SCADA with Moxa's free Active OPC Server, which can provide instant I/O status reports with event-driven "Active Tags."
  • The ioLogik E1200's user-defined Modbus address function offers the flexibility of dynamic Modbus addresses, which can be configured to be compatible with other Modbus devices, making it easier to upgrade existing systems.
  • Key Products

    ioLogik E1200 Series of Remote Ethernet I/O Products
  • Built-in 2-port Ethernet switch for daisy-chain topologies
  • Free push-based Moxa Active OPC Server Lite
  • User-defined Modbus/TCP addressing
  • MXIO programming library for Windows/WinCE VB/VC.NET and Linux C APIs
  • Web configuration with Import/Export function
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