3 I/O Processing and Response Delay

FX3S/FX3G/FX3GC/FX3U/FX3UC Series



6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.4



6.4 Mutual Relationship Among Program Flow Control Instructions



Mutual Relationship Among Program Flow Control Instructions

The table below shows the mutual relationship among various program flow control instructions.

In the table below, "

overlapped.



" indicates containment relationship, and "



Instruction in top line



Instruction in top line



Instruction in

left line



Instruction in

left line



Example 1: MC −− CJ −− P −− MCR

Top line

Left line



" indicates that zones are partially



MC-MCR

octet



Example 2: MC −− CJ −− MCR −− P

CJ-P



EI-DI



FOR-NEXT



Example

1



MC-MCR

Example

2



CJ-P



EI-DI



quintet



FOR-NEXT

*2

inside

one

STL



STL-RET



P-SRET



I-IRET



FEND-END

*1



O-FEND



O-END

(no FEND)



172



*1



STL-RET



FX3S/FX3G/FX3GC/FX3U/FX3UC Series



6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.4 Mutual Relationship Among Program Flow Control Instructions



1

Introduction



2

Overview



:This combination can be used without any problem.

× :This combination is not allowed; Operation error may be occurs.

:This combination is allowed, but is better not to be used because the operation will be complicated.

I-IRET



3



Remarks



FEND-END

*1



Instruction

List



P-SRET



The DI skip status occurs, but this is not an

error.



4



*2



FOR



NEXT



NEXT



Devices

in Detail



FOR



The operation indicated by continuous lines is

described.



*1



The first FEND or END is valid, but the intended

processes will not occur. But this is not an

error.



5

Specified the

Device &

Constant



*3



6

Before

Programming



Instructions having containment relationship can

be combined except some combinations as

follows:



7



2) STL-RET cannot be used in FOR-NEXT, P-SRET

and I-IRET.

3) MC-MCR, FOR-NEXT, P-SRET and I-IRET cannot

be interrupted by I, IRET, SRET, FEND, END, etc.



*3



*3



8

FNC00-FNC09

Program Flow



*3



Basic

Instruction



1) MC-MCR cannot be used in FOR-NEXT, STL-RET,

P-SRET and I-RET.



9

FNC10-FNC19

Move & Compare



*3



*3



10



*3



FNC20-FNC29

Arith. & Logic

Operation



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6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.5 General Rules for Applied Instructions



6.5



General Rules for Applied Instructions



6.5.1



Expression and operation type of applied instructions



Instructions and operands

- Both a function number FNC 00 to FNC

and a symbol (mnemonic) indicating the contents are given to

each applied instruction.

For example, a mnemonic "SMOV (shift move)" is assigned to FNC 13 instruction.

- Some applied instructions function only with their instruction part, but many instructions consist of the instruction

part and following operands.

Command

input



S



FNC 13

SMOV



S



m1



m2



D



n



: An operand whose contents do not change by execution of the instruction is called "source", and is

indicated by this symbol.

When a device number can be indexed with index registers, the source is expressed as

with addition of " ".

When there are two or more sources, they are expressed as S1



D



, S2



, etc.



: An operand whose contents change by execution of the instruction is called "destination", and

indicated by this symbol.

When indexing is allowed and there are two or more destinations, they are expressed as



m, n



S



D1



,



D2 , etc. in the same way as sources.

: Operands not falling under source or destination are expressed as m and n.

When indexing is allowed and there are two or more such operands, they are expressed as m1 ,

m2 , n1 , n2 ,etc. in the same way as sources and destinations.



- In applied instructions, the program step of the instruction part always occupies 1 step, but each operand

occupies 2 or 4 steps depending on whether the instruction is 16-bit type or 32-bit type.



Devices handled as operands

- Bit devices themselves such as X, Y, M and S may be handled.

- Combined bit devices, KnX, KnY, KnM, KnS, etc, may be handled as numeric value data.

→ Refer to Section 5.4.

- Data registers (D) and current value registers for timers (T) and counters (C) may be handled.

- Though data registers (D) are the 16-bit type, two serial data registers are combined when 32-bit data is

handled.

For example, when a data register D0 is specified as an operand in a 32-bit instruction, D1 and D0 are combined

to handle 32-bit data. (D1 handles high-order 16 bits, and D0 handles low-order 16 bits.)

When current value registers for T and C are used as general data registers, they are handled in the same way.

However, each of 32-bit counters C200 to C255 can handle 32-bit data, and cannot be specified as an operand

in a 16-bit instruction.



174



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6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.5 General Rules for Applied Instructions



1



Applied instructions are classified into "16-bit type" or "32-bit type" by the size of handled numeric values. And by the

operation type, applied instructions are classified into "continuous operation type" or "pulse operation type".

Some applied instructions have every combination of this form and type, and others do not.



1. 16-bit type and 32-bit type



Command 1

Command 2



FNC 12

MOV



D10



D12



This instruction transfers the contents of D10 to D12.



FNC 12

DMOV



D20



D22



This instruction transfers the contents of D21 and D20 to D23

and D22.



X001



FNC 12

MOVP



D10



D12



6

FNC 12

MOV



D10



D12



In the continuous operation type of some instructions such as INC (FNC 24) and DEC (FNC 25), the contents of the

destination change in every operation cycle.

" is added to the



No.

FNC 12

Instruction name P

MOV



8

FNC00-FNC09

Program Flow



In any case, instructions are not executed while the drive input X000 or X001 is OFF. And the destinations do not

change except when instructions specify otherwise.



7

Basic

Instruction



For applied instructions requiring attention in using the continuous operation type, the symbol "

title of the explanation of such instructions as shown in the figure below.



D



5



Before

Programming



Continuous operation type

The figure on the right shows a continuous operation type instruction.

While X001 is ON, the instruction is executed in every operation cycle.



X000



Specified the

Device &

Constant



Pulse operation type

In the example shown in the figure on the right, when X000 turns from

OFF to ON , the instruction is executed only once, and is not executed

in any other case.

When it is not necessary to continually execute an instruction, use the

pulse operation type.

The symbol "P" indicates the pulse operation type.

"DMOVP" indicates also the pulse operation type.



4

Devices

in Detail



2. Pulse operation type and continuous operation type



3

Instruction

List



- In a 32-bit type instruction, the symbol "D" is added (example: DMOV).

- Either an odd or even device number can be specified, and a specified device is combined with a device having

the subsequent larger number (in the case of word devices such as T, C and D).

For avoiding confusion, it is recommended to specify an even device number (which will be the low-order side)

for an operand in a 32-bit instruction.

- 32-bit counter (C200 to C255) is regarded as 32 bits, and cannot be used as an operand in a 16-bit instruction.



2

Overview



- Applied instructions handling numeric values are classified into the 16-bit type or the 32-bit type by the bit length

of the numeric value data.



Introduction



Instruction form and operation type



9

FNC10-FNC19

Move & Compare



10

FNC20-FNC29

Arith. & Logic

Operation



175



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6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.5.2



6.5 General Rules for Applied Instructions



Handling of general flags

In some types of applied instructions, the following flags operate:

Examples:

M8020: Zero flag

M8021: Borrow flag

M8022: Carry flag

M8029: Instruction execution complete flag

M8090: Block comparison signal

M8328: Instruction non-execution flag

M8329: Instruction execution abnormal complete flag M8304: Zero Flag

M8306:Carry Flag

These flags turn ON or OFF every time various instructions turn ON, but do not change when various instructions turn

OFF not driven or when errors have occurred.

Because these flags turn ON or OFF in many instructions, the ON/OFF status of flags change every time such

instructions are executed.

Program flag contacts directly under each instruction while referring to the examples below.



1. Program containing many flags (example of instruction execution complete flag M8029)

When two or more instruction execution complete flags M8029 are programmed together for applied instructions, it is

difficult to determine which instruction executes which flag.

For using flags in any positions other than directly under applied instructions, refer to the next page.



...



Good example

M8000



FNC 72

DSW

M8029

Execution is

completed



FNC 22

MUL



Y10



D0



D0



K10



K1



D20



...



M8029 works as

a flag to indicate

that execution of

DSW is

completed.



X10



X000

SET

FNC 57

DPLSY



M0

M8029 works as

a flag to indicate

that execution of

DPLSY is

completed.



Bad example



M8029 works as

a flag to indicate

that execution of

DSW is

completed.



RST



Y000



M0



RST



Execution is

completed



M0



M8029

Execution is

completed



M8000



FNC 72

DSW



X10



SET



M0



FNC 57

DPLSY



Program for the second DPLSY

instruction



Y10



D0



K1



K1000



D20



Y000



First DPLSY instruction



FNC 22

MUL



D0



K10



D20



Program for DSW

instruction



FNC 57

DPLSY



K1000



D22



Y001



Second DPLSY

instruction



X000



M8029

Execution is

completed



M1



176



D20



M8029



M0



M8029 works as

a flag to indicate

that execution of

the first DPLSY

is completed.



K1000



...



M8029 works as

a flag to indicate

that execution of

the second

DPLSY is

completed.



M0



FX3S/FX3G/FX3GC/FX3U/FX3UC Series



6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.5 General Rules for Applied Instructions



1

When two or more applied instructions are programmed, general flags turn ON or OFF when each applied instruction

turns ON.

Accordingly, when using a flag in any position other than directly under an applied instruction, set to ON or OFF

another device just under the applied instruction, and then use the contact of the device as the command contact.



DSW execution

complete flag

M8029 is

changed to

M100.



FNC 72

DSW



Y10



D0



K1



3

Instruction

List



M8029

M100



Execution is

completed



M0



FNC 57

DPLSY



K1000



D20



Y000



4



M8029

RST



Execution is

completed



Devices

in Detail



DPLSY

execution

complete flag

M8029 is

changed to

M200.



X10



M0



M200



5



FNC 22

MUL



Specified the

Device &

Constant



...



It works as DSW

execution

complete flag.

M100



2

Overview



...



M8000



Introduction



2. Introduction of method for using flags in any positions other than directly under applied

instructions



D0



K10



D20



6

Before

Programming



It works as

DPLSY execution

complete flag.

M200

Y030



7

Basic

Instruction



8

FNC00-FNC09

Program Flow



9

FNC10-FNC19

Move & Compare



10

FNC20-FNC29

Arith. & Logic

Operation



177



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6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



6.5.3



6.5 General Rules for Applied Instructions



Handling of operation error flag

When there is an error in the applied instruction configuration, target device or target device number range and an

error occurs while operation is executed, the following flag turns ON and the error information is stored.



1. Operation error

Error flag



Error code storage device



M8067



Error detected step number storage device



D8067



FX3S/FX3G/FX3GC PLCs



FX3U/FX3UC PLCs



D8069



D8315, D8314

D8069



• When an operation error has occurred, M8067 turns ON and D8067 stores the operation error code number.

• In the FX3U/FX3UC PLCs, D8315 and D8314 (32 bits in total) store the step number in which the error has occurred.

When the error occurrence step number is up to 32767, the error occurrence step can be checked also in D8069

(16 bits).

• In the FX3S/FX3G/FX3GC PLCs, D8069 stores the error occurrence step number.

• If another error occurs in another step, the stored data is updated in turn to the error code and step number of the

new error. (These devices are set to OFF when errors are cleared.)

• When the PLC mode switches from STOP to RUN, these devices are cleared instantaneously, and then set to ON

again if errors have not been cleared.



2. Operation error latch

Error flag



Error code storage device



M8068



Error detected step number storage device



−



FX3S/FX3G/FX3GC PLCs



FX3U/FX3UC PLCs



D8068



D8313, D8312

D8068



• When an operation error has occurred, M8068 turns ON.

• In the FX3U/FX3UC PLCs, D8313 and D8312 (32 bits in total) store the step number in which the error has occurred.

When the error occurrence step number is up to 32767, the error occurrence step can be checked also in D8068

(16 bits).

• In the FX3S/FX3G/FX3GC PLCs, D8068 stores the error occurrence step number.

• Even if another error has occurred in another step, the stored data is not updated, and remains held until these

devices are forcibly reset or until the power turns OFF.

• When the error occurrence step is up to the 32767th step, the error occurrence step can be checked in D8068 (16

bits).



6.5.4



Handling functions of extension flag

In some applied instructions, the function can be extended by combining a specific special auxiliary relay determined

for each applied instruction. An example is explained below.

- When X000 turns ON, this instruction exchanges the

contents of D10 and D11 with each other.



- If M8160 has been driven before the XCH instruction and

the source and destination of the XCH instruction are

specified to the same device, high-order 8 bits and loworder 8 bits are exchanged with each other inside the

device.

- For returning this XCH instruction to the normal XCH

instruction, it is necessary to set M8160 to OFF.



X000



X000



FNC 17

XCHP



D10



D11



M8160 Function extension flag

for the XCH instruction

FNC 17

XCHP

M8160



D10



D10



Same number



When using an instruction requiring the function extension flag in an interrupt program, program DI instruction (for

disabling interrupt) before driving the function extension flag, and program EI instruction (for enabling interrupt) after

turning OFF the function extension flag.



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6 What to Understand before Programming



Programming Manual - Basic & Applied Instruction Edition



1



Limitation in the number of instructions and limitation in simultaneous instruction

instances



Introduction



6.5.5



6.5 General Rules for Applied Instructions



Limitation in the number of instructions



2



Some applied instructions can only be used up to the specified number of times.

Allowable number of times of

use



FNC 52 (MTR)



Remarks

MTR instruction can only be used once in program.



FNC 56 (SPD)



8 (1 instruction/1 input or less)



Pay attention so that this instruction does not overlap the input numbers of in DVIT

instruction, DOG inputs in ZRN instruction, zero point signal in DSZR instruction,

input interrupt numbers and high-speed counter input numbers.



FNC 60 (IST)



1



−



FNC 69 (SORT)



1



−



FNC 70 (TKY)



1



−



FNC 71 (HKY)



1



−



FNC 75 (ARWS)



1



−



FNC 77 (PR)



2



−

−



FNC280 (HSCT)



1



4



−



5 (1 instruction/1 input or less)



−



Devices

in Detail



2



FNC186 (DUTY)



FNC149 (SORT2)



3

Instruction

List



1



Overview



Instruction name



Limitation in simultaneous instances of instructions



1. Positioning instructions



2. High-speed processing instructions

• FX3S/FX3G/FX3GC PLCs

The FNC 53 (HSCS), FNC 54 (HSCR) and FNC 55 (HSZ) instructions can be driven up to 6 times in total at the

same time.



3. External device communication instructions



• It is impossible to combine and use "FNC 80 (RS), FNC 87 (RS2)", "FNC270 (IVCK) to FNC275 (IVMC)", "FNC276

(ADPRW)", "FNC300 (FLCRT) to FNC305 (FLSTRD)" instructions for the same port.

• In FNC270 (IVCK) to FNC275 (IVMC) instructions, two or more instructions can be driven at the same time for the

same port.



9

FNC10-FNC19

Move & Compare



• In FNC 80 (RS) and FNC 87 (RS2) instructions, do not drive two or more instructions at the same time for the same

port.



8

FNC00-FNC09

Program Flow



• FX3U/FX3UC PLCs

In FNC 53 (HSCS), FNC 54 (HSCR) and FNC 55 (HSZ) instructions (including FNC280 (HSCT) instruction), make

sure that up to 32 instructions are driven at the same time. [FNC280 (HSCT) instruction can only be used once.]

Note that "FNC280 (HSCT) instruction", "table high-speed comparison mode of FNC 55 (HSZ) instruction)" and

"frequency control mode of FNC 55 (HSZ) instruction" can each only be used once.



7

Basic

Instruction



Do not drive FNC 57 (PLSY), FNC 58 (PWM), FNC 59 (PLSR), FNC150 (DSZR), FNC151 (DVIT), FNC156 (ZRN),

FNC157 (PLSV), FNC158 (DRVI) and FNC159 (DRVA) instructions at the same time for the same output number.



6

Before

Programming



Some applied instructions can be programmed two or more times, but the number of simultaneous instances is

limited.

Even in instructions not shown below, if two or more instructions are driven at the same time for the same I/O number,

it is regarded as double outputs. In some combinations of instructions, the operation may be disrupted, or the

instructions cannot be executed.

For details, refer to the caution described in each instruction page.

For combinations of instructions, refer to "6.4 Mutual Relationship Among Program Flow Control Instructions".



5

Specified the

Device &

Constant



When using above instructions beyond the allowable number of times of use

For instructions whose operands allow indexing, device numbers and numeric values in such instructions can be

changed by index registers.

By indexing, when driving multiple instances simultaneously is not required, such instruction can be used as if they

were used beyond the allowable number of times.

→ Refer to "Subsection 5.7.3. Indexing example for instruction with limited number of use.".



10

FNC20-FNC29

Arith. & Logic

Operation



179



FX3S/FX3G/FX3GC/FX3U/FX3UC Series

Programming Manual - Basic & Applied Instruction Edition



6 What to Understand before Programming

6.6 Symbolic information storage and block password



6.6



Symbolic information storage and block password



6.6.1



Storage of symbolic information

The FX3U/FX3UC PLC Ver. 3.00 or later can store symbolic information (data indicating the program configuration such

as structure and labels).

By using this function, you can read symbolic information from the PLC, and edit labels, function blocks, etc.

GX Works2 Ver. 1.62Q or later is required to store symbolic information.

→ Refer to the GX Works2 Version 1 Operating Manual (Common) for the details on symbolic information.



Cautions

• When symbolic information is stored, it is deleted if the memory capacity set by parameters is changed.

After changing the memory capacity, write the symbolic information again.

• Memory cassettes (except for the FX3U-FLROM-1M) which save symbolic information are also supported

by FX3U/FX3UC PLCs whose version is earlier than Ver. 3.00. In that case, the FX3U/FX3UC PLC operates,

but the written symbolic information is invalid.

• For writing symbolic information and changing the set values of timers and counters using a peripheral

device, it is recommended to create programs with set values specified indirectly.

If the set values are specified directly, programs cannot be restored from symbolic information after the set

values are changed.



6.6.2



Block password

In GX Works2, program parts can be protected by setting the block password.

In the FX3U/FX3UC PLC Ver. 3.00 or later, the setting "Read-protect the execution program" is available for the block

password.

→ Refer to the GX Works2 Version 1 Operating Manual (Common) for the details on the block password.



Cautions

• In the PLC written by the computer using a project including a block password for which the setting "Readprotect the execution program" is valid, restoration of programs is enabled only when the PLC stores the

symbolic information.

For editing programs using a peripheral device which cannot read symbolic information (only supported by

GX Works2 Ver. 1.62Q or later), do not use a block password for which the setting "Read-protect the

execution program" is valid.

• When a peripheral device tries to read an execution program from the PLC that has been written to by a

computer using a project including a block password for which the setting "Read-protect the execution

program" is valid, a communication error occurs and reading is disabled.

• For writing a program using a peripheral device other than GX Works2 (Ver. 1.62Q or later) to a PLC that

has been written to by a computer using a project including a block password for which the setting "Readprotect the execution program" is valid, execute "Clear PLC memory" to clear programs before writing.

If a program is written without executing "Clear PLC memory" in advance, the written program cannot be

read.

• It is not possible to write programs including the block password for which the setting "Read-protect the

execution program" is valid to the FX3U/FX3UC PLC whose version is earlier than 3.00.

• If a memory cassette which saves programs including a block password for which the setting "Readprotect the execution program" is valid is used for the FX3U/FX3UC PLC whose version is earlier than 3.00,

the FX3U/FX3UC PLC does not run normally.



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7 Basic Instruction



Programming Manual - Basic & Applied Instruction Edition



1

Introduction



7.



Basic Instruction



Mnemonic



Name



Symbol



Function



Applicable devices



Reference



3



Contact Instruction

X,Y,M,S,D .b,T,C



Section 7.1



Initial logical operation

contact type NC (normally

closed)



X,Y,M,S,D .b,T,C



Section 7.1



LD



Load



LDI



Load Inverse



Applicable devices



LDP



Load Pulse



Applicable devices



Initial logical operation of

rising edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



LDF



Load Falling Pulse



Applicable devices



Initial logical operation of

falling/trailing edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



AND



AND



Applicable devices



Serial connection of NO

(normally open) contacts



X,Y,M,S,D .b,T,C



Section 7.3



ANI



AND Inverse



Applicable devices



Serial connection of NC

(normally closed) contacts



X,Y,M,S,D .b,T,C



Section 7.3



ANDP



AND Pulse



Applicable devices



Serial connection of rising

edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



ANDF



AND Falling Pulse



Applicable devices



Serial connection of falling/

trailing edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



Applicable devices



Parallel connection of NO

(normally open) contacts



X,Y,M,S,D .b,T,C



Section 7.4



Applicable devices



Parallel connection of NC

(normally closed) contacts



X,Y,M,S,D .b,T,C



Section 7.4



7



Applicable devices



Parallel connection of rising

edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



Basic

Instruction



Initial logical operation

contact type NO (normally

open)



Instruction

List



Applicable devices



2

Overview



This chapter explains types and functions of basic sequence instructions.

For beginners to sequence control, we offer "Introduction Course" and "Relay Ladder Course" learning texts for

reference.

We can also offer the PLC learning software "Beginner Course".



Applicable devices



Parallel connection of falling/

trailing edge pulse



X,Y,M,S,D .b,T,C



Section 7.5



8



OR Inverse



ORP



OR Pulse



ORF



OR Falling Pulse



6

Before

Programming



ORI



5

Specified the

Device &

Constant



OR



Devices

in Detail



OR



4



FNC00-FNC09

Program Flow



9

FNC10-FNC19

Move & Compare



10

FNC20-FNC29

Arith. & Logic

Operation



181



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7 Basic Instruction



Programming Manual - Basic & Applied Instruction Edition



Mnemonic



Name



Symbol



Function



Applicable devices



Reference



Connection Instruction

ANB



AND Block



Serial connection of multiple

parallel circuits



−



Section 7.7



ORB



OR Block



Parallel connection of

multiple contact circuits



−



Section 7.6



MPS



Memory Point

Store



MPS



Stores the current result of

the internal PLC operations



MRD



Memory Read



MRD



Reads the current result of

the initial PLC operations



MPP



Memory POP



MPP



Pops (recalls and removes)

the currently stored result



INV



Inverse



MEP



MEF



Section 7.8



−



Section 7.8



Section 7.8



Invert the current result of

the internal PLC

operations



−



Section 7.10



MEP



Conversion of

operation result

to leading edge pulse



−



Section 7.11



MEF



Conversion of

operation result

to trailing edge pulse



−



Section 7.11



INV



Out Instruction



Applicable devices



Final logical operation type

coil drive



Y,M,S,D .b,T,C



Section 7.2



SET Applicable devices



Set bit device latch ON



Y,M,S,D .b



Section 7.13



Reset



RST Applicable devices



Reset bit device OFF



Y,M,S,D .b,T,C,

D,R,V,Z



Section 7.13



PLS



Pulse



PLS Applicable devices



Rising edge pulse



Y,M



Section 7.12



PLF



Pulse Falling



PLF Applicable devices



Falling/trailing edge pulse



Y,M



Section 7.12



Denotes the start of a master

Y,M

control block



Section 7.9



OUT



OUT



SET



SET



RST



Master Control Instruction

MC



Master Control



MC N Applicable devices



MCR



Master Control

Reset



MCR N



Denotes the end of a master

control block



−



Section 7.9



No operation or null step



−



Section 7.14



Program end, I/O refresh and

return to step 0



−



Section 7.15



Other Instruction

NOP



No Operation



End Instruction

END



182



END



END