ioLogik E2200 Series
Active OPC Server
6-3
Introduction to Active OPC Server
Moxa Active OPC Server Lite is a software package that operates as an OPC driver of an HMI or SCADA system.
It offers seamless connection from Moxa ioLogik series products to SCADA systems, including the most popular
Wonderware, Citect, and iFix. Active OPC Server Lite meets the latest OPC DA3.0 standard that allows
connections to various kinds of devices and host OPC machines.
Active OPC Server—From Pull to Push
The first time a user looks up an I/O divice’s Modbus table, 19 or more steps (including specifying the IP
address, selecting protocols, and defining data type) may be required to create one tag. The procedure needs
to be repeated again and again until tags for all devices are created. A technician can expect to take 1 minute
to create just one tag. But what if there are 400 tags in the OPC system? In addition, creating more and more
tags can put a big load on your CPU.
OPC also requires connected I/O devices to use fixed IP addresses. For applications running on a public network
(which usually means dynamic IPs) or when portable wireless equipment is used, there is no way to connect to
an I/O device using OPC. This architecture is also called “pull” technology because the OPC server continuously
polls I/O devices (based on the tags) and then “pulls” the data back to the server.
Moxa’s Smart Ethernet Remote I/O Devices
have extended the concept of Active Reporting from TCP/UDP
messages, emails, and SNMP Traps to the OPC Server. It is easy to set the IP address of an Active OPC server
and choose updated I/O tags. An Active OPC server running on the host PC will receive these I/O tags and tag
data automatically.
With “push” technology, which also supports tag updates, the ioLogik only sends updates to Active OPC Server
Lite when the I/O status changes. Compared to constantly polling (i.e., pull-based) the status, this feature
efficiently reduces network bandwidth usage and speeds up the response time with event-driven, push-based
status updates. At the same time, the heartbeat function visually confirms that the ioLogik is “alive” and
working.
Summary of Contents for ioLogik E2210
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