Programmable Logic Controllers (PLC's)
- Allen-Bradley Incorporated - Motor control, switchgear, PLC's
- American Digital Corp - PLC's, front-end processors, etc.
- Control Technology Corporation - Controllers for servo, steppers, sensing, and I/O
- Cutler-Hammer - PLC's
- Eurotherm Controls - Temperature and process controllers
- Hitachi - PLC's
- Honeywell Inc. IAC - TDC control systems and controllers
- Industrial Controls Div of Williamsport Electric, Inc. - PLC's, control panels
- Omron Electronics, Inc. - Factory automation equipment and control components
- PLC Direct - by Koyo, small PLC's
- Schneider Automation - Programmable controllers
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Siemens - Electronics and electrical equipment
- Square D - Electrical distribution and factory automation products
- Texas Instruments - Programmable controllers, industrial microprocessors