Archive for category Cellular
The situation: Plant operators needed notification and a log of events or alarms happening at a remote pump station, 17 miles away.
The options: First, the engineers considered installing dedicated leased phone lines with modems. But when one engineer asked if anybody really remembered or understood the AT codes the modems used (back in the early Internet days), and noone did, they dropped that option. Next, they investigated license-free wireless. That proved impractical: There were hills and valleys between the plant and remote station (no line of sight), and they’d have to lease property between the two locations and install repeater towers at an additional expense.
So, how did they get the data across 17 miles without leasing land or resurrecting obsolete technology? The answer was much simpler and less expensive than they anticipated. Read the rest of this entry »
The answer to the Which Wireless is Best for Me? webinar question is, “it depends”.
With a decade of license-free industrial wireless experience under our belts, I’m confident that there’s a best wireless solution for everyone. But which technology and network depends on what you’re trying to accomplish. Some people just need a couple I/O points, others a plant-wide network to handle I/O and WiFi.
If you missed the webinar and want to see and hear the considerations for industrial wireless, go here: http://www.lesman.com/train/webinars/Webinar_Which-Wireless.htm
I just got my hands on a cellular modem that can stream analog data from a remote site to a SCADA/HMI/PLC/DCS/PAC, send a text message or an email on alarm, or receive a text message that can control a relay output (yes, it’s all secure ! !).