Wireless monitoring of instrumentation sensors such as temperature, flow, pressure, voltage, current, levels, weight, speeds, revolutions and others is a common requirement in the control industry. The term 'wireless' is used for any system used to transfer of information over a distance without the use of electrical conductors or 'wires'. The distances involved may be short (a few meters) like with a television remote or long (thousands or millions of kilometers) for radio or satellite communications. Wireless OPC solutions exist to meet all needs.
OPC and the Wireless Network:
In order to extend OPC connectivity beyond a wired LAN, complementary technology that effectively supports DCOM-style interfaces across wider network connections is needed. All that is required to support such technology is a TCP/IP-capable layer, which extends OPC communications over wireless networks. For many applications there is little difference between communicating over a LAN verses a WLAN.
To read in detail this article by MAtrikonOPC please click 'Wireless OPC'
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