Siemens SIMATIC IM 151/CPU User Manual

Addressing
2-3
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Address Assignment
Depending on the slot, 1 byte is reserved for digital I/Os and 16 bytes are reserved
for analog I/Os in the address areas of the IM 151/CPU for each I/O module
(maximum of 63).
The table below indicates the default address assignment for analog and digital
modules per slot. The address areas of the I/O modules are ”visible” only to an
IM 151/CPU in the ET 200S, not to the associated DP master. The DP master has
no direct access to the I/O modules.
Table 2-1 Addresses of the ET 200S I/O Modules
Reserved
Add A
Slot Number
Address Area
1 2 3 4 5 6 7 8 ... 66
Digital
modules/
motor starters
IM 151/CPU - 1 2 3 4 ... 62
Analog
modules,
process-related
modules
- 272 to
287
288 to
303
304 to
319
320 to
335
... 1248 to
1263
Power modules 256 272 288 304 320 1248
The unassigned addresses in the range 64 to 127 are in the process image in
default addressing and can be used any way you choose in the user program. If
2 bits in a byte are already occupied by a digital module, the remaining 6 bits
cannot be used as you choose (e.g. the bits 1.4 to 1.7 in Figure 2-3).
You can use the bytes in the address areas that are not used by modules in any
way you choose in your user program. In the configuration in Figure 2-3, for
example, bytes 2 and 3 can be used as you choose.
Example of Slot-Oriented Address Assignment for I/O Modules
The figure below illustrates a sample ET 200S configuration, showing an example
of the address allocation for I/O modules. The addresses for the I/O modules are
predefined in default addressing.
PM 4 DI
IM
151/
CPU
2 AI 2 AO
256
Allocated addresses
Slot numbers
45 6 78
1 to 3
1.0
to
1.3
288
to
291
304
to
307
4.0
to
4.3
4 DO
ET 200S
Figure 2-3 Example of Address Assignment for I/O Modules

Siemens SIMATIC IM 151/CPU Specifications

General

Brand	Siemens
Model	SIMATIC IM 151/CPU
Category	Control Unit
Language	English