Example Of Address Assignment For I/O Modules; Addresses Of The Et 200S I/O Modules - Siemens SIMATIC IM 151/CPU Manual

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
Address Area Add A
1 2
Digital IM 151/CPU
modules/
motor starters
Analog
modules,
process-related
modules
Power modules
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.
Slot numbers
ET 200S
Allocated addresses
Figure 2-3
ET 200S Interface Module IM 151/CPU
A5E00058783-01
3 4 5
- 1
- 272 to
287
256 272
1 to 3
IM
151/
CPU

Example of Address Assignment for I/O Modules

Slot Number
6 7 8
2 3 4
288 to 304 to 320 to
303 319 335
288 304 320
4 5 6 7
PM 4 DI 2 AI 2 AO
256 1.0
288 304
to to
to
1.3 307
291
Addressing
... 66
... 62
... 1248 to
1263
1248
8
4 DO
4.0
to
4.3
2-3