24-Relay 16 A Ethernet Board with 8 I/O Channels and Snubbers

It can be controlled over a LAN (Local Area Network), from a smartphone or through the Internet. With Devantech’s powerful dScript language you can add your own functions and controls to the modules that support it, build a custom web page, add your own logo, buttons and features, add a TCP server, answer incoming TCP requests with your own routines, include a TCP client and send TCP data packets to other devices using your own protocol.

Power supply: 12 Vdc-500 mA (not included, see related products), dimensions (mm): 250x123x20. The board is supplied ready assembled and tested.

• Simple configuration and setup from a web browser
• Can be controlled from a web page
• Set up peer-to-peer control in a few clicks
• Up to eight 32-bit counters with capture and reset, 10 counts / second on the inputs
• Daily or weekly timed event schedules
• Sends e-mail notifications on selected events
• Free Android and iPhone apps are available to control this module remotely
• Fitted with a snubber (suppressor) across the common and normally open contact of every relay. It is needed to limit arcing across the relay contacts with inductive loads, which can otherwise stick or weld the contacts together.

Examples of inductive loads that need an RC suppressor:

• Motors
• Solenoids
• Relays (where the coil is driven as a load by the first relay)

RC snubbers are not ideal for every application, because they leak a small amount of AC current, and that is no good for audio signals, for instance. A small AC current flowing in the load can mean power still gets through even when the relay is off. Snubbers should really only be used where the load is inductive.

• Relays: 24 relay outputs with N.O. and N.C. contacts (24 Vdc or 250 Vac / 16 A)
• Snubber: Yes, fitted across the common and normally open contact of every relay
• Power supply: 2.1 mm jack socket – 12 Vdc (adapter not included)

Multi-threading
Multi-threading is the ability to run many parts of the program at the same time. It is like having a separate CPU for each part of the program. Each part or section of the program is called a thread. dScript is a native multi-threading compiler. Any number of threads can be created, up to the limit of the available RAM.

Web server
With the dScript web server you can write your own web pages and upload them to the module. The site can display your variables in any way you like, using AJAX techniques to keep them live and up to date. You can use buttons on the web page to control the module, use CSS to style your site and include images, logos and so on.

Safe and secure
Using a technique similar to the way banks check that you are the owner of a credit card, only your own browser/device combination can reach the web pages. The server sends three independent random numbers that select three random characters from a pre-stored password. These are encrypted and stored as a cookie, and it is that cookie that allows the web page to be displayed. The cookie is deleted when the browser is closed, and is also invalidated by the server after a few seconds of inactivity or when you log out. The result is that you, and only you, can reach the web page.

• dScript downloads