Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 145)

 
Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
11-9
Glossary of Terms
U
U
Rack unit. A unit of measure used to
describe the height of equipment intended
for mounting in a standard rack. Equivalent
to 44.45mm (1-¾ inches).
V
validation
In quality assurance, confirmation that the
product does what the user requires.
verification
In quality assurance, confirmation that the
product conforms to the specifications.
voting system
A redundant system (m out of n) which
requires at least m of the n channels to be in
agreement before the system can take
action.
W
withstand voltage
The maximum voltage level that can be
applied between circuits or components
without causing a breakdown.