The Siemens 6AG1140-4DK04-4AB3 is a SIMATIC Box PC 627D — a DIN-rail-mountable industrial embedded controller designed for continuous operation in cabinets or on machine frames. It ships with a choice of Celeron 827E, Core i3-3217UE, or Core i7-3517UE processors, up to 8 GB DDR3 SO-DIMM (ECC optional), and a 2.5" SATA SSD of at least 80 GB (160 GB optional). The unit runs 24 V DC and is rated IP20 at the front and rear.
Mounts on DIN rail, directly to a wall, or in portrait orientation — the 262 mm width and 139.7 mm height fit standard enclosures; depth is only 50.5 mm, so it doesn't hog gland-plate space. Comes with 2x PCIe slots (optionally configurable as 1x PCIe x4 or 2x PCIe x1/x4 with card retainer) for motion cards, fieldbus interfaces, or vision grabbers. Onboard PROFIBUS/MPI (isolated, 12 Mbit/s) is CP 5611-compatible, saving a slot. Four USB 3.0 ports and dual display outputs (DisplayPort + DVI-I, plus optional VGA adapter) make peripheral connection straightforward. Serial RS-232 on COM1, optional second RS-232 on COM2. Runs from a single 24 V DC supply; surge immunity tested to ±1 kV symmetric and ±2 kV asymmetric per IEC 61000-4-5, so it holds up in mixed-power cabinets near contactors or drives.
Shock tested to 5 g, 30 ms per DIN IEC 60068-2-29. EMC compliant with EN 55022A (Class A emission), EN 61000-6-4 (generic emission standard for industrial environments), and EN 61000-6-2 (immunity for industrial environments). The watchdog timer and temperature monitoring keep the OS in check during abnormal conditions.