Schneider Electric's Modicon M340 PAC
Simple, intuitive and exceptionally powerful, Modicon M340 PAC provides numerous cost and performance advantages over comparably priced PLCs. It requires no battery and is a compact 4 in. high and 3.7 in. deep with high-density, 64-point I/O cards, and is only 1.25 in. wide. It uses CANopen networks and USB cables. The PAC has 4 Mb of memory upgradeable to 16 Mb and a 70K instructions/ms execution speed.