Thanks for all the suggestions guys. The FitPC looks promising but I didn't see an option for Windows Standard Embedded. Stealth models seem a little dated and they don't offer a high ambient rating. The SEL unit looks good, also a little dated though and no mention of Win embedded.
Here's what I see as our basic requirements:
- Compact, Fanless enclosure, DIN rail mount
- Medium performance
- Low power consumption
- Win Embedded Standard 7
- 24V DC supply
- High ambient operation, at least +55C
- Replaceable battery
We used Stealth until around 2009 or so. Back in the days of WinXP you needed a UPS, when the UPS battery died every boot was like Russian roulette, cross your fingers and hope for the best. And we had numerous HD failures, probably heat related.
The release of XP Embedded was a lifesaver. We used the first generation Siemens Microbox and had good success with it, apart from some overheating issues. It had a CF card for storage, so writes were dead slow, but not a problem for an HMI with minimal data logging. Although we did have a CF failure, in Mexico, so it was probably heat related. The next generation was a big improvement.
Meanwhile, we had been doing some work with Beckhoff and were impressed with their CX5000 series embedded computers. The first ones we used ran TwinCat PLC over Win CE. Win CE is crude by today's expectations, but shortly thereafter Beckhoff released the CX5000 with Win Embedded 7. The CX5100 series variant is very impressive, with only 9W total power dissipation it truly is a fanless computer. If this model may be ordered without the Beckhoff TwinCat PLC software to serve as a general purpose embedded computer; it does include the bus interface for Beckhoff Ethercat or K-bus, which you can ignore.
So here's my shortlist (in order of preference):
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Cincoze DC 1100-10. Configured with wide temp range RAM and CFAST card, Win 7 Embedded, DIN rail mount. -20 to 70C ambient operation. Processor: Intel Bay Trail E3845 quad core CPU. Dual graphics (DVI/DisplayPort). - Lowest price.
www.logicsupply.com/dc-1100-10
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Beckhoff CX-5120. -25 to 60C ambient, Win 7 Embedded Standard, Intel Bay Trail E3815 CPU, Replaceable RTC battery (an advantage if a machine is to sit idle for extended periods). Built in 1s UPS. Many options available. Lowest power dissipation. Reasonable Price. Long availability.
www.beckhoff.com - IPC - Embedded PC - CX5100
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Siemens IPC427D. 0 to 55C ambient. Win 7 Embedded Standard, Intel Celeron 827E CPU. - Highest price
http://w3.siemens.com/mcms/pc-based...-pc/box-pc/simatic-ipc427d/pages/default.aspx