YME Engineering Course

J. SEQUENCE CONTROL FUNCTION
J.2.7 OUTPUT TIMING OF SEQUENCE CONTROL BLOCK
The output timing of sequence control block and logic chart block indicates the
conditions to execute the output processing when the sequence table is started
periodically or as a one shot. There are two types of output timing as below:
♦ Output only when conditions change (C)
♦ Output each time conditions are satisfied (E)
The output timing of function blocks excluding sequence control blocks is “Output
each time conditions are satisfied (E).”
J.2.8 CONTROL PERIOD FOR SEQUENCE TABLE BLOCKS
The control period for the ST16, ST16E blocks refers to the interval at which the
periodic execution- type ST16 or ST16E block executes the sequence table. The
control period can be set in the Function Block Detail Builder.
♦ Control period: Set a value between 1 and 16 seconds. Default is 1
second.
J.2.9 CONTROL PHASE FOR SEQUENCE TABLE BLOCKS
The control phase for the ST16, ST16E blocks refers to the timing at which the
sequence table is executed in the control period. It sets the execution timing
relative to the execution timing of the phase-zero sequence table. The control
phase can be set in the Function Block Detail Builder.
♦ Control phase: Set a value between 0 and 15 seconds. Default is 0
second.
J.3. LOGIC CHART BLOCK (LC64)
Logic Chart Block (LC64) may combine or arrange the signals of other function
blocks; process I/O and software I/O into an application for interlock sequence
control. An architecture of LC64 Logic Chart Block is shown as follows.
LC64 block is a sequence control function block with 32 input and 32 output
signal channels and it can handle 64 logic operators.
Figure: Function Block Diagram of Logic Chart Block (LC64)
YME Training Center J-8
CS3KR3-ENG 1 ST Edition Jan 2002