*Learn below listed*
ABB/Elsag Bailey/Alfa Laval
Alfa Laval/ABB/Elsag Bailey
Allen-Bradley
ALSTOM/Cegelec
Aromat/Matsushita
Array Electronics
AutomationDirect/PLC Direct/Koyo/
B&R Industrial Automation
Bachmann
Beck Electronic/Festo
Beckhoff
Berthel gmbh
Bosch
Bristol Babcock
Cegelec/ALSTOM
CNI
Control Microsystems
Crouzet Automatismes
Control Technology Corporation
Cutler Hammer/IDT
Delta
Divelbiss
Eberle/GE-Fanuc (Europe)
Elsag Bailey/ABB/Alfa Laval
Elsist
Entertron
Fatek Automation
Festo/Beck Electronic
FF Automation
Fisher & Paykel
Fuji Electric
GE-Fanuc
GE-Fanuc/Eberle (Europe)
Gefran/SIEI
Giddings & Lewis
Gould/Modicon
Groupe Schneider
Hima
Hitachi
Honeywell
Horner Electric
Ibercomp
Idec
IDT/Cutler Hammer
Industrial Control Links
International Parallel Machines
Jetter gmbh
Keyence Corporation
Kirchner Soft
Klockner-Moeller
Koyo/AutomationDirect/PLC Direct
LG Industrial Systems
Liyan Electric
Matsushita (Europe)/Aromat
Messung
Microconsultants/SPLat
Mitsubishi
Modicon/Gould
Moore Products/Siemens
Nyquist/P8
Omron
Opto22
P8/Nyquist
Pilz
Pixsys
PLC Direct/Koyo/AutomationDirect
Poscon
Reliance
Rockwell Automation
Rockwell Software
RTP Corporation
SAIA-Burgess
Schleicher
Schneider Electric
Selectron
Sharp
Shihlin
SIEI/Gefran
Siemens/Moore Products
Sigmatek
Sixnet
SMAR
SoftPLC/Tele-Denken
SPLat/Microconsultants
Square D
Teco a. s.
Tele-Denken/SoftPLC
Telemecanique
Toshiba
Toyoda/Toyopuc
Triangle Research
Triconex
Unitronics
Yokogawa
The PLCopen(IEC 61131-3)