FX-TRN-BEG-E
A: Let’s Learn the FX Series PLC! 1
B-5
1.1.3
Points of Learning and Control Specifications
1) What is sequence control?
"Sequence control"
This is not a familiar term generally but sequence control happens around us every day. You
probably have seen or touched objects under sequence control.
In a dictionary*, the word "sequence" is explained as follows:
a)succession
b)connected line of events, ideas, etc.
c)the order in which they occur
d)three or more next to each other in value
* Oxford Advanced Learner’s Dictionary of Current English" (Oxford University Press)
Based on the above, we can see that the word "sequence" indicates "succession" and "the
order in which they occur".
The meaning of the term "sequence control" is derived from the word "sequence", and
indicates the control of operations in accordance with the predetermined order. The word
"control" indicates "means by which a machine, etc. is operated or regulated".
Let’s take a look at a familiar example and see how the PLC is used.
In the picture below, a door is opened and closed.
The person follows the necessary procedure and manipulates the door to allow a car to
pass through.
Opening and closing of the door (manual)
The car approaches
the door.
The person opens
the door.
The car passes
through the opening.
The person closes
the door.
Operation sequence
Summary of Contents for MELSEC-F FX-TRN-BEG-E
Page 1: ...USER S MANUAL FX TRN BEG E Sections INTRODUCTION A EXERCISES B LADDER PROGRAMS C APPENDIX D ...
Page 2: ...FX TRN BEG E ...
Page 4: ...FX TRN BEG E ii ...
Page 6: ...FX TRN BEG E iv ...
Page 8: ...FX TRN BEG E INTRODUCTION A 2 MEMO ...
Page 10: ...FX TRN BEG E Introduction 1 A 4 MEMO ...
Page 28: ...FX TRN BEG E Outline of the Lesson Plan 2 A 22 MEMO ...
Page 40: ...FX TRN BEG E A Let s Learn the FX Series PLC 1 B 12 MEMO ...
Page 52: ...FX TRN BEG E B Let s Study the Basics 2 B 24 MEMO ...
Page 76: ...FX TRN BEG E D Beginner Challenge 4 B 48 MEMO ...
Page 90: ...FX TRN BEG E E Intermediate Challenge 5 B 62 MEMO ...
Page 106: ...FX TRN BEG E F Advanced Challenge 6 B 78 MEMO ...
Page 110: ...FX TRN BEG E Outline 1 C 4 MEMO ...
Page 162: ...FX TRN BEG E D 32 MEMO ...
Page 163: ......