台达DVP-ES2_EX2_SS2_SA2_SX2操作手册.pdf_台达es2接线端子说明,台达dvp32es2说明书

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1-1

PLC Concepts

This chapter introduces basic and advanced concepts of ladder logic, which is the mostly

adopted programming language of PLC. Users familiar with the PLC concepts can move to

the next chapter for further programming concepts. However, for users not familiar with the

operating principles of PLC, please refer to this chapter to get a full understanding of PLC

concepts.

Chapter Contents

1.1 PLC Scan Method...............................................................................................................1-2

1.2 Current Flow........................................................................................................................1-3

1.3 NO Contact, NC Contact ....................................................................................................1-3

1.4 PLC Registers and Relays.................................................................................................1-4

1.5 Ladder Logic Symbols.......................................................................................................1-5

1.5.1 Creating a PLC Ladder Program...........................................................................1-6

1.5.2 LD / LDI (Load NO contact / Load NC contact).....................................................1-7

1.5.3 LDP / LDF (Load Rising edge trigger/ Load Falling edge trigger).........................1-7

1.5.4 AND / ANI (Connect NO contact in series / Connect NC contact in series)..........1-7

1.5.5 ANDP / ANDF (Connect Rising edge in series/ Connect Falling edge in series)..1-7

1.5.6 OR / ORI (Connect NO contact in parallel / Connect NC contact in parallel) .......1-8

1.5.7 ORP / ORF (Connect Rising edge in parallel/ Connect Falling edge in parallel)..1-8

1.5.8 ANB (Connect block in series) ..............................................................................1-8

1.5.9 ORB (Connect block in parallel)............................................................................1-8

1.5.10 MPS / MRD / MPP (Branch instructions) ..............................................................1-8

1.5.11 STL (Step Ladder Programming) ..........................................................................1-9

1.5.12 RET (Return) .......................................................................................................1-10

1.6 Conversion between Ladder Diagram and Instruction List Mode...............................1-11

1.7 Fuzzy Syntax.....................................................................................................................1-12

1.8 Correcting Ladder Diagram.............................................................................................1-14

1.9 Basic Program Design Examples ...................................................................................1-16

DVP-ES2/EX2/SS2/SA2/SX2 Operation Manual - Programming

1-2

1.1 PLC Scan Method

PLC utilizes a standard scan method when evaluating user program.

Scanning process:

Scan input status

Read the physical input status and store the data in internal

memory.

Evaluate user program

Evaluate the user program with data stored in internal memory.

Program scanning starts from up to down and left to right until

reaching the end of the program.

Refresh the outputs

Write the evaluated data to the physical outputs

Input X

Input terminal

Store to memory

Input signal memory

Device Memory

Read X0 status from memory

Write Y0 state into

Read Y0 state from memory

Write M0 state into

Output

Program

Input signal

Output

Output Y

Output terminal

Output latched memory

Input signal:

PLC reads the ON/OFF status of each input and

stores the status into memory before evaluating

the user program.

Once the external input status is stored into

internal memory, any change at the external

inputs will not be updated until next scan cycle

starts.

Program:

PLC executes instructions in user program from

top to down and left to right then stores the

evaluated data into internal memory. Some of this

memory is latched.

Output:

When END command is reached the program

evaluation is complete. The output memory is

transferred to the external physical outputs.

Scan time

The duration of the full scan cycle (read, evaluate, write) is called “scan time.” With more I/O or

longer program, scan time becomes longer.

Read

scan time

PLC measures its own scan time and stores the value (0.1ms) in register

D1010, minimum scan time in register D1011, and maximum scan time in

Measure

scan time

Scan time can also be measured by toggling an output every scan and then

measuring the pulse width on the output being toggled.

Calculate

scan time

Scan time can be calculated by adding the known time required for each

instruction in the user program. For scan time information of individual

instruction please refer to Ch3 in this manual.

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