Moxa NA-4010 [7/94] Traditional remote i o

Moxa NA-4021 [7/94] Traditional remote i o
ioLogik E4200 Introduction
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ioLogik Active Ethernet Modular I/O System
Overview
The ioLogik Active Ethernet modular I/O family of slice-type network I/O products can connect sensors and
on/off devices in any combination and can transfer the captured data or device status to a host computer via
an Ethernet or IP-based network.
ioLogik Active Ethernet modular I/O products consist of two main parts: (1) the network adaptor, and (2) I/O
modules. The network adaptor provides system and field power to connected I/O modules. Up to 16 I/O
modules can be connected to one network adaptor.
Network I/O expansion modules; up to 16 slots
Adaptor (up to 256 DIOs or 64 AIOs)
Traditional Remote I/O
Remote Ethernet modular I/O solutions have been on the market for a long time. Traditional solutions are
“passive,” in the sense that I/O devices wait passively to be polled by a host computer. The response time in
this type of setup, however, tends to be on the order of seconds. The “passive” remote modular I/O structure
is inadequate for data acquisition and control systems that require an efficient, real-time I/O solution with a
response time on the order of hundredths of a second.
Active Ethernet Modular I/O
Moxa’s Active Ethernet modular I/O solutions were developed specifically to address the limitations of the
traditional passive approach. With the passive approach, the host computer polls the I/O device over the
network for the status of each I/O device. With the active approach, the Active Ethernet modular I/O product
intelligently sends the host computer status information only when specified events occur. Using push
technology, the ioLogik I/O device greatly reduces the load on the CPU and network resources. Far fewer
network packets are required and in general the packets are smaller in size since I/O information is only sent
when needed, and only information from the specified I/O device is sent.
Moxa’s active I/O messaging system uses TCP or UDP for I/O messaging and supports sending messages to up
to ten host computers simultaneously. In addition to providing intelligent status reporting, Active Ethernet I/O
products are backwards compatible. That is, they support all of the functions and capabilities of traditional
passive remote I/O products.

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