|
Characteristics
|
Relay Systems
|
Digital Logic
|
Computers
|
PLC system
|
|
Price per function
|
Fairly
Low
|
Low
|
High
|
Low
|
|
Physical size
|
Bulky
|
Very compact
|
Fairly compact
|
Very compact
|
|
Operating speed
|
Slow
|
Very fast
|
Fairly fast
|
fast
|
|
Electrical
noise immunity
|
Excellent
|
Good
|
Quite good
|
Good
|
|
Installation
|
Time
– consuming to design and install
|
Design
time-consuming
|
Programming
extremely time-consuming
|
Simple
to program and install
|
|
Capable
of complicated operations
|
No
|
Yes
|
Yes
|
Yes
|
|
Ease
of changing function
|
Very
difficult
|
Difficult
|
Quite
simple
|
Very
simple
|
|
Ease
of maintenance
|
Poor-large
number of contacts
|
Poor
if PLCs soldered
|
Poor
–several custom boards
|
Good
–few standard cards
|
|
|
Design
and install
|
Consuming
|
Time
consuming
|
Install
|
Sunday, November 11, 2012
Comparison of Control System
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