Siemens S7-300 - 4 Addressing and installation; 4.1 Address Assignments in the CPU

Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
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Addressing and installation
4
4.1 Address Assignments in the CPU
Address assignment in standard and safety mode
The fail-safe signal modules occupy the following address ranges in the CPU/F-CPU:
● In standard mode: The full I/O area (within and outside the process image)
● In safety mode for
S7 Distributed Safety and for S7 F/FH Systems in the area of the
process image
Table 4- 1 Address assignment in standard and safety mode
Bytes occupied in the CPU:
Module
In the input area In the output area
SM 326; DI 24 x DC 24 V x + 0 to x + 9 x + 0 to x + 3
SM 326; DI 8 x NAMUR x + 0 to x + 5 x + 0 to x + 3
SM 326; DO 8 x DC 24V/2A PM x + 0 to x + 4 x + 0 to x + 4
SM 326; DO 10 x DC 24V/2A x + 0 to x + 5 x + 0 to x + 7
SM 326; F-DO 10 x DC 24V/2A PP x + 0 to x + 5 x + 0 to x + 7
SM 336; AI 6 x 13Bit x + 0 to x + 15 x + 0 to x + 3
SM 336; F-AI 6 x 0/4 ... 20 mA HART x + 0 to x + 15 x + 0 to x + 3
x = module start address
Address assignment of user data
Of the assigned addresses in standard and safety mode of the F-SMs, the user data occupy
the following addresses in the CPU/F-CPU.
Table 4- 2 Address assignment of user data
Assigned bits in the CPU for each module:
Bytes in the CPU
7 6 5 4 3 2 1 0
SM 326; DI 24 x DC 24 V:
x + 0 Channel 7 Channel 6 Channel 5 Channel 4 Channel 3 Channel 2 Channel 1 Channel 0
x + 1 Channel
15
Channel
14
Channel
13
Channel
12
Channel
11
Channel
10
Channel 9 Channel 8
x + 2 Channel
23
Channel
22
Channel
21
Channel
20
Channel
19
Channel
18
Channel
17
Channel
16
SM 326; DI 8 x NAMUR:
x + 0 Channel 7 Channel 6 Channel 5 Channel 4 Channel 3 Channel 2 Channel 1 Channel 0