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How industrial PC have changed since IBM introduced its first hardened PC

Posted 01-26-2018 at 12:28 AM by Allen123

One reason for this is the vast amount of MS-DOS software available for industrial control. A quick look through computer and trade publications reveals a number of interesting software products for PC-based design, monitoring, and control. Another reason for PC proliferation is the significant improvements made in the electronics and packaging of PCs. When asked how industrial pc have changed since IBM introduced its first hardened PC, manufacturers cite a number of enhancements.

PC vs PLC

When the first [URL="http://www.szjawest.cn/index.php/windows-panel-pc.html"]industrial PC[/URL]s were introduced, there was considerable skepticism. Frequent comparisons between the PC and PLC usually rated the PC on the short side. Since then, the electronics and packaging engineers have taken a good look at PCs (PLCs) so that specifications for industrial PCs now meet or exceed those of the PLC.

Many manufacturers have designed their PCs to be more PLC-like. Packages have become modular, with models available in NEMA-rated enclosures; communication ports are optically isolated; and operating specifications have been expanded to include factory floor temperature and vibration levels. Many PCs for the control environment are based on a passive backplane system. Active and passive components are on plug-in, replaceable boards to increase system reliability and repairability.

A large growth area for ruggedized PCs is in their use as operator interfaces to PLCs. Nematron Corp. added a built-in monitor and keyboard to an AT. The result is its Ultra Workstation series which includes 14 and 19-in. monitors and bundled software products such as ScreenWare2 from Computer Technology Corp. and The Fix from Intellution. According to Nematron, a single industrial PC can replace an entire, complicated control panel consisting of hardwired components.

PC Bus Clones

Although IBM charted new territory with its Microchannel bus, the PC Bus remains the most popular architecture for factory floor PCs. The defacto standard created by an almost universal adoption of PC Bus and MS-DOS ensures many more years on the factory floor for the IBM PC clone. The following is a sampling of some of the products available. Well known for its Shoebox PCs, Action Instruments has 32-bit, 16-MHz, 80386-based BC-30 and BC-32 computers. As upgrades to Action's BC-20 and 22 computers, these units use the same passive backplanes and accept both XT and AT cards. Standard on-board RAM is 1 Mbyte, with expansion up to 8 Mbytes of RAM available on the processor board. With modular plug-ins and shroud packaging, the BC-32 is an example of a PLC look-alike.

Color Graphics

Many industrial PCs are being applied as operator interfaces. The 80386 Industrial Workstation from Comark Corp. offers NEMA 4 or 12 packaging for its AT-compatible workstation and an integral tilt/swivel display. The 14 or 19-in. display is available with CGA, EGA, or VGA graphics and an optional touchscreen. The user has a complete operator-interface system including 80386 CPU, 2 Mbytes of memory, 19-in. display, membrane keyboard, a 720 Kbyte floppy disk drive, and a 40 Mbyte Winchester drive, all for under $10,000.

Mac Attack

Although the IBM clone is king of the industrial PCs, there are exceptions to the PC Bus rule. One comes in the form of a Macintosh designed for industrial use. Back in 1987, Automatix Inc. introduced its AI90, an industrialized version of Apple's Macintosh II. Although NuBus is touted as an open architecture, Apple holds all rights to proprietary Mac logic. To build the AI90, Automatix buys a Mac II from Apple, strips it down to board level, adds some enhancement boards, and repackages it, all in a steel NEMA 2 enclosure. With its main business in the machine vision and robotics industry, Automatix offers a vision system based on the AI90, the Autovision 90. To the Motorola 68020-based AI90, Automatix adds its own vision software, ASAP.

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