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Case Study
A typical inquiry was, "I want to receive an email when my CNC machine finishes a long job. How do I hook up an embedded server to do that?"
"Oh, there's one catch: My CNC machine is old. Can I just hook up something across one of the lights on the panel?"
You can handle this with any of the Control Solutions embedded servers that have I/O points, including i.Board, i.Board-2, AddMe Jr., and AddMe III.
The example shown below uses an i.Board, and illustrates both inputs and outputs. You can apply this same approach to AddMe Jr. You can use just the input part of this example with i.Board-2. You can use the input part of this example to expand to up to 8x 120VAC inputs on i.Board, or 12x 120VAC inputs on AddMe Jr.
Components required in addition to the i.Board are: 1 ea. Opto 22 PB4 motherboard (not PB4A), 2 ea. IAC24 solid state input relay, 2 ea. OAC24 solid state output relay.
The '24' in the part numbers IAC24 and OAC24 means 24VDC logic. You only need a single 24VDC power supply if you use the 24V versions of the Opto 22 parts. Other voltages are available. The input and output voltage rating for IAC24 and OAC24 is 90-140VAC. The output rating is 2 amps.
We used 120VAC I/O in our example here just because that is one very common requirement. Opto 22 has DC versions of input and output relays, and other load ratings as well. Furthermore, Opto 22 is not the only brand of solid state relay that could be used in this manner. In fact, some of our customers have even used mechanical relays instead.
You do not need additional I/O modules at all if you are using 24VDC or less. The FET outputs on all Control Solutions devices are rated for 30VDC at 1 amp, and relays are rated even higher. The inputs are all tolerant of inputs to 24VDC and will correctly sense on/off at up to 24VDC. You will only get linear voltage measurements in the range of 0-10VDC, but will get reliable on/off detection to 24VDC due to internal current limiting and voltage clamping.
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