Issue
140 March 2002
Replacing
Relays with Ladder Logic
Part
1: Getting Ready for the Climb
by
Fred Eady
SOURCES
& PDF
Part
2
Download
the PDF of this article (parts 1 & 2).
Fred Eady has
more than 20 years of experience as a systems engineer.
He has worked with computers and communication systems
large and small, simple and complex. His forte is embedded-systems
design and communications. Fred may be reached at fred@edtp.com.
SOURCES
ULN2003,
ULN2803 Arrays
Allegro MicroSystems, Inc.
(508) 853-5000
Fax: (508) 853-7861
www.allegromicro.com
T100MD888+
PLC
Triangle Research International, Inc.
(877) 689-3245
www.tri-plc.com
