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General programming notes

8.3.1

Address symbols

-4

8.3 Address structure

8.3.1 Address symbols

Each STEP7 bit is represented by an address starting with a symbol that identifies the func-

tion of the bit (e.g., input or output). The symbol of the address of an output bit is letter Q,

not letter O (to distinguish from number 0).

In this manual, all bit addresses are expressed in accordance with the IEC international stan-

dard representation. Thus the function of each bit can be easily identified by looking at its

symbol (for example, "I" means an input bit, and "Q" means an output bit).

8.3.2 Bit address

A bit address is expressed in the following format:

Symbol Function Examples

I Input I5.2

Q Output Q54.3

M Memory (internal relay) M12.7

D Data DBX1.1

Timer T24

Counter C15

P Peripheral

(e.g., analog, direct I/O access)

PIW128

PQW128

Local stack L1.2, LW2

Byte address

Bit address

Address symbol

I 0.0

I 0.1

I 0.2

I 0.3

I 0.4

I 0.5

I 0.6

I 0.7

I 1.0

I 1.1

I 1.2

I 1.3

I 1.4

I 1.5

I 1.6

I 1.7

I 2.0

Q 0.0

Q 0.1

Q 0.2

Q 0.3

Q 0.4

Q 0.5

Q 0.6

Q 0.7

Q 1.0

Q 1.1

Q 1.2

Q 1.3

Q 1.4

Q 1.5

Q 1.6

Q 1.7

Q 2.0

M 0.0

M 0.1

M 0.2

M 0.3

M 0.4

M 0.5

M 0.6

M 0.7

M 1.0

M 1.1

M 1.2

M 1.3

M 1.4

M 1.5

M 1.6

M 1.7

M 2.0

T 0

T 1

T 2

T 3

T 4

T 5

T 6

T 7

T 8

T 9

T 10

T 11

T 12

T 13

T 14

T 15

T 16

C 0

C 1

C 2

C 3

C 4

C 5

C 6

C 7

C 8

C 9

C 10

C 11

C 12

C 13

C 14

C 15

C 16

DBX 0.0

DBX 0.1

DBX 0.2

DBX 0.3

DBX 0.4

DBX 0.5

DBX 0.6

DBX 0.7

DBX 1.0

DBX 1.1

DBX 1.2

DBX 1.3

DBX 1.4

DBX 1.5

DBX 1.6

DBX 1.7

DBX 2.0

入力､出力､ビットメモリ､データの表記

Address for input, output, memory, and data bits

T 1

Address symbol

Number

Address for timers and counters

(0,1,2,3,4,5,6,7,8,9,10,11)

(0,1,2,3,4,5,6,7,)

(I,Q,N,DBX)

(0,1,2,3,4,5,6,7,8,9,10,11)

(T,C)

I 1.2

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 372 373

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Drivedata DR2 Especificaciones Pagina 126

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