I had a customer ask about I/O expansion.
Did you know that cnReach has onboard I/O inputs totaling 8 plus 2 native serial ports? If additional I/O ports are needed, the cnReach I/O expander can be used to fulfill this need for an additional 8/2? Need more? Each I/O expander is individually addressed with an IP address so if MODBUS TCP is being used, connecting to each additional expander is a breeze. Daisy chaining or converging to a switch at the site are two easy solutions.
Does anyone see needs for I/O expansion past 1 I/O Expander Module?
Do you have a similar application or question? Feel free to share or ask.
Thanks to Bruce Collins for the clarification
Depending on the client requirements, you could easily reach 30 i/o lines and this heavily depends on what kind of monitoring is required. Dry contacts are used for just about every type of access, fire and flood detection. A simple circuit can be made to provide high and low battery voltage triggers as a dry contact.
I am sure this is not new to you but there is a very good example of a directly monitored system that can easily get over 12 contacts and depending on the granularity required can be in the order of 100 contacts. Using ModBus tcp and a graphical monitor such as lookout you can build quite the complex monitor system. The serial ports could be used to communicate to actuators that control relays.
I have a scaled down version of something similar monitoring and reporting my tower site conditions and battery states.