INFICON Cygnus Thin Film Deposition Controller - Manual (Page 90)

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Cygnus Operating Manual
 Single or multiple actions may be triggered by Inputs or the fulfillment of a user
specified logical condition.
 Single or multiple complex defined conditions are used to define an event.
 The logical operators; AND, OR, and NOT (negate) as well as grouping
operators (parentheses) are available to define very precise conditionality.
 It is possible to execute an action immediately or delay it for a defined period of
time through the use of a timer or counter.
 Each Logic Statement is evaluated every measurement cycle of 100 ms.
 The components of the Logic statements may be the transition between or
entry of a specific state, specific programmable time limits, programmable
thickness limits or various error conditions
 Inputs and outputs may be named on the I/O MAP display. Additionally on this
display, the outputs may be defined as normally open (NO) or normally closed
(NC).
 Logic statements may be chained together using the Statement ### Event.
These features allow moderately complex vacuum processing plants to be
controlled without the addition of any other intelligent machines. Fourteen TTL
inputs and eight relay outputs are standard. An additional fourteen inputs and eight
relay outputs are available with an optional I/O card. With a second optional I/O
card, eight more relays and fourteen open collector outputs are available.
Cygnus has the capacity for 100 logic statements.
4.4.2 Editing Logic Statements
A series of conditional events and a related series of actions may be defined
through the Logic Statements. When a logic statement has an event or action
defined, the Logic Directory screen will display ">" character after the statement
number. When the event string is determined to be true the associated actions are
executed in left to right order. The state of the Logic statement is indicated on the
Logic Directory display. Three small asterisks under the Logic Statement number
indicate the statement is true (active). The expressions are evaluated in numerical
sequence starting with logic statement 1.
To initiate Logic Statement Set-Up, select function key F1 (GENERAL
PARAMETERS) on the All Channels display. Then, select function key F1 (LOGIC
DIRECTORY). On the Logic Directory display, select F5, SELECT LOGIC
STATEMENT, to define and edit the logic statement. This will invoke the Logic
Statements display (see
Figure 4-5 ). Upon entry, the cursor will be placed at the
last referenced Logic statement. Entries for four statements are shown on each
display page.