PLC functions and capabilities are being usurped by a new class of emerging products that are best called general machine controllers, or GMCs. These devices are a mix of motion control, PC architectures, Windows operating systems, PLC programming in IEC 61131 languages, and network communications. Many GMCs are being offered by traditional PLC vendors, which call them a variety of names, including automation controllers, automation platforms, or industrial controllers.
It appears that PLCs have carved out a huge, unassailable niche of their own at the low end of the machine control market, while GMCs are moving in from the top, replacing high-priced traditional automation products.
The following is the final installment on PLCs. Click on "New Products" under Recent Articles on the home page to review the first two installments.
Servo Amplifier Boards
The AMP-20420 two-axis and AMP-20440 four-axis servo amplifier boards attach directly to the 96-pin DIN connector of the company's DMC-2143 controller without the need for any cable or wiring, and can drive brush-type servomotors up to 200 W. The 20440 contains four transconductance PWM amplifiers on a single 4.95x3.75 in. board, while the AMP-20420 has two PWM amplifiers. Each amplifier produces up to 200 W and accepts 20-60 VDC, 3.3 A with no external heat sink required.
Galil Motion Control
800/377-6329 www.galilmc.com
Digital Gets Tough
National Instruments
800/258-7022 www.ni.com
Panel-Mount PLC Packs PID
Aromat
800/228-2350 www.aromat.com
High-Speed Driving
Rockwell Automation
800/223-5354 www.ra.rockwell.com
Handles the Harsh
888/462-9466 www.axiomtek.com
Net-Capable PLCs
IDEC
800/262-IDEC www.idec.com
Packaging Machine-Capable
Phoenix Contact
800/586-5525 www.phoenixcon.com