YME Engineering Course

J. SEQUENCE CONTROL FUNCTION
Figure: Example of Conditional Branch in step sequence
J.2.5 RULE EXTENSION
The number of rules in one sequence table is fixed at 32 and cannot be modified.
However, if the number of rules in a sequence table is not enough to describe
one phase unit, it can be extended in the 32-rule unit by connecting to another
sequence table. The number of rules can be extended for a step-type sequence
table.
♦ Method of Rule Extension
To extend the number of rules, specify a tag name for the rule extension
block (ST16E) in the sequence table setting area of the extending
sequence table (ST16). It does not matter if the number of signals and
signal contents are different between the extending sequence table
(ST16) and extended sequence table (ST16E). The number of rules can
be extended in the 32-rule unit per block. An example of the number of
rules extended to 64 is shown below.
Figure: Examples of Rule Extension
J.2.6 PROCESSING TIMING
A sequence control block and a logic chart block have the following four types of
execution timing:
♦ Periodic Execution (T)
♦ One-Shot Execution (O)
♦ Initial Execution/Restart Execution (I)
♦ Restricted Initial Execution (B)
YME Training Center J-7
CS3KR3-ENG 1 ST Edition Jan 2002