2. INSTRUCTIONS
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MELSEC-A
2. INSTRUCTIONS
2.1 Classification
The instructions of MELSEC-A series are largely classified into sequence
instruc-tions, basic instructions, and application instructions. These instructions are
shown in Table 2.1.
Table 2.1 Classification of Instructions
Classification of instructions Description page
Contact instruction
Operation start, series connection, parallel
connection
5-2 to 5-4
Connection instruction
Ladder block connection, operation result
storage/read
5-5 to 5-13
Output instruction Bit device output, pulse output, output reverse 5-14 to 5-26
Shift instruction Bit device shift 5-28 to 5-29
Master control instruction Master control 5-30 to 5-33
Termination instruction Program termination 5-34 to 5-35
Sequence
instruction
Other instructions Program stop, no operation, etc. 5-36 to 5-43
Comparison operation instruction Comparison such as =, >, and < 6-2 to 6-7
Arithmetic operation instruction
Addition, subtraction, multiplication, and
division of BIN and BCD
6-8 to 6-37
BCD ↔ BIN conversion instruction Conversion from BCD to BIN and BIN to BCD 6-38 to 6-45
Data transfer instruction Transfer of specified data 6-46 to 6-57
Program branch instruction Program jump, subroutine/interrupt program call 6-58 to 6-69
Program switching instruction Switching between main and subprogram 6-70 to 6-82
Basic
instruction
Refresh instruction Link refresh, partial refresh execution 6-83 to 6-90
Logical operation instruction
Logical operation such as logical sum and logical
product
7-2 to 7-21
Rotation instruction Rotation of specified data 7-22 to 7-30
Shift instruction Shift of specified data 7-31 to 7-39
Data processing instruction
Data processing such as 16-bit data search,
decode, and encode
7-40 to 7-58
FIFO instruction Read/write of FIFO table 7-59 to 7-63
Buffer memory access instruction
Data read/write with special function modules and
remote terminals(A2C/A52G).
7-64 to 7-87
FOR to NEXT instruction
Program repeated between FOR and NEXT
instruction
7-88 to 7-89
Local, remote I/O station access
instruction
Local, remote I/O station data read/write 7-90 to 7-103
Display instruction ASCll code print, character display on LED, etc. 7-104 to 7-120
Others
Instructions which are not included in the above
classification, such as WDT reset, and set/reset of
carry flag.
7-121 to 7-138
Application
instruction
Instructions for servo programs Servo program execution and set value change 7-139 to 7-148
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