Siemens Simatic S7-300 CPU 31xC Series User Manual

Addressing
7.1 Slot-specific addressing of modules
S7-300, CPU 31xC and CPU 31x: Installation
7-2 Operating Instructions, Edition 08/2004, A5E00105492-05
The figure below shows the slots of an S7-300 and the corresponding module start
addresses:
Rack 2 (EM)
Rack 1 (EM)
Rack 3 (EM)
Rack 0
(CU)
1
2
3 4
0
5
4
256 272
6
8
288
7
12
304
8
16
320
9
20
336
10
24
352
11
28
368
Slot number
Digital module start address
Digital module start address
4
4
4
3
3
3
32
64
96
5
5
5
36
68
100
384
512
640
400
528
656
6
6
6
40
72
104
416
544
672
7
7
7
44
76
108
432
560
688
8
8
8
48
80
112
448
576
704
9
9
9
52
84
116
464
592
720
10
10
10
56
88
120
480
608
736
11
11
11
60
92
124
496
624
752
SF
SF
BUSF
BUSF
DC5V
DC5V
FRCE
FRCE
RUN
RUN
STOP
STOP
SIEMEN S
CPUPS IM
IM SM
SM
SM
SM
SM
SM
SM
SM
SM
IM SM
SM
SM
SM
SM
SM
SM
SM
SM
IM SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
Not CPU 31xC
Slot number
Digital module start address
Analog module start address
Slot number
Digital module start address
Analog module start address
Slot number
Digital module start address
Analog module start address

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)