I thought I would share what I use for Controlling everything from lighting to electric wall heaters to electric boiler, garage door openers, wind turbine controller etc.
Here is a picture of one of my lighting controllers.
Supply voltage - 24 VDC
Has 8 Digital inputs which can take up to supply voltage (24V)
Has 6 Digital Outputs which can handle up to Supply voltage as well.
Has 2 built in 14bit Analog input Channels which are 0-10Volt
CPU processing times:
for bit operations, typ. 0.085 µs; / instruction
for word operations, typ. 1.7 µs; / instruction
for floating point arithmetic, typ. 2.3 µs; / instruction
Digital Output Switching frequency - 100 kHzBuilt in Web Server
Builtin PID Controllerand Ethernet programmable with excellent software.Here is the basic setup of the PID controller.
And it has a nice tuner built into it.
Siemens Family Product Page
http://w3.siemens.com/mcms/programmable-logic-controller/en/basic-controller/s7-1200/pages/default.aspxSiemens Technical Datasheet
http://tinyurl.com/z4j9h3lEbay Link to one for 180$
http://tinyurl.com/hmhqw54