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3
Programming with Symbols
3.1
Absolute Addresses
Every input and output has an absolute address predefined by the hardware
configuration. This address is specified directly; that is, absolutely.
The absolute address can be replaced by any symbolic name you choose.
ON
OFF
Absolute address:
STEP 7 Getting Started
A5E00171228-01
Digital input
module
Byte 0
Bits 0 to 7
RUN P
RUN
STOP
M RES
Digital input
L+
N
module
Byte 1
L+
M
M
Bits 0 to 7
L+
L+
M
M
Input
Byte 1
0
SF
1
BATF
2
DC 5V
3
FRCE
RUN
4
STOP
5
6
7
0
1
2
3
4
5
6
7
I
1.5
Bit 5
You should only use absolute programming if you do not
have to address many inputs and outputs in your S7
program.
Digital output
0
0
1
1
module
2
2
Byte 4
3
3
4
4
Bits 0 to 7
5
5
6
6
7
7
0
0
Digital output
1
1
2
2
module
3
3
Byte 5
4
4
5
5
Bits 0 to 7
6
6
7
7
3-1
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