Common Point Technologies Inc. (Sugar Grove, IL) is an automation systems integrator whose "Interposing PLC" allows packaging machines with proprietary controllers to communicate with other controllers, whether they're proprietary or industry-standard PLCs or PCs.
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A white paper from Electro Cam (Roscoe, IL) titled "Internal High-Speed Logic" explains in plain language what a programmable limit switch is and how it performs machine logic by using inputs from sensors and switches to trigger outputs such as solenoids.
Orion® PC-based motion controllers from Ormec (Rochester, NY) now offer Ethernet connections to Allen-Bradley PLCs that support Ethernet. The controllers can also be used for communications with PCs running popular human-machine interface software packages.
REB's (Menomonie, WI) PLC-controlled IVS system uses air purge and vacuum to clean containers before filling with aqueous or viscous product. It handles volumes from less than 1 oz to 1 L with accuracies of ±0.5% of the fill weight.