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Siemens Simatic S7 Series User Manual

Siemens Simatic S7 Series
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29
I/O Numbering S7-200 inputs and outputs are labeled at the wiring terminations
and next to the status indicators. These alphanumeric symbols
identify the I/O address to which a device is connected. This
address is used by the CPU to determine which input is present
and which output needs to be turned on or off.
I designates a discrete input and Q designates a discrete
output. The first number identifies the byte, the second number
identifies the bit.
Image register space for digital I/O is always reserved in
increments of eight bits (one byte). If a module does not
provide a physical point for each bit of each reserved byte,
these unused bits cannot be assigned to subsequent modules
in the I/O chain.
Each analog I/O point is associated with a 16-bit word in the
S7-200 PLC and is identified by AI (for analog input) or AQ
(for analog output) followed by a W (representing a word of
memory) and a starting byte number. Analog I/O words start on
even-numbered bytes (such as 0, 2, or 4).
Analog I/O points are always allocated in increments of two
points. If a module does not provide physical I/O for each of
these points, these I/O points are lost and are not available for
assignment to subsequent modules in the I/O chain.
The following example shows the addressing for one sample
application.
Module 1 Module 3
14 D isc re te In 10 D isc re te O u t
2 A na log In 1 A na log O ut 4 D isc re te In 4 D iscrete O ut 8 D is crete In 4 A na log In 1 A na log O ut 8 D isc re te O ut 4 A na log In 1 A nalog O ut
I0.0 Q 0.0 I2.0 Q 2.0 I3.0 AIW 4 A QW 4 Q 3.0 A IW 12 AQ W 8
I0.1 Q 0.1 I2.1 Q 2.1 I3.1 AIW 6 A QW 6 Q 3.1 A IW 14 A Q W 10
I0.2 Q 0.2 I2.2 Q 2.2 I3.2 AIW 8 Q 3.2 A IW 16
I0.3 Q 0.3 I2.3 Q 2.3 I3.3 A IW 10 Q 3.3 A IW 18
I0.4 Q 0.4 I2.4 Q 2.4 I3.4 Q 3.4
I0.5 Q 0.5 I2.5 Q 2.5 I3.5 Q 3.5
I0.6 Q 0.6 I2.6 Q 2.6 I3.6 Q 3.6
I0.7 Q 0.7 I2.7 Q 2.7 I3.7 Q 3.7
I1.0 Q 1.0 Expa ns ion I/O
I1.1 Q 1.1
A ddress es show n with a blac k b ack g ro und are n ot availab le an d c ann ot be us ed in the pro gra m .
I1.2 Q 1.2
I1.3 Q 1.3
I1.4 Q 1.4
I1.5 Q 1.5
I1.6 Q 1.6
I1.7 Q 1.7
A IW 0 A Q W 0
A IW 2 A Q W 2
Loc al I/O
CPU 224XP
Module 0
Module 2
Module 4
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Siemens Simatic S7 Series Specifications

General IconGeneral
CPUVaries by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication InterfacesPROFIBUS, PROFINET, Ethernet, MPI
ProgrammingTIA Portal, STEP 7
Programming LanguagesLAD, FBD, STL, SCL, GRAPH
I/O ModulesDigital, Analog, Specialty modules available
Operating Temperature0°C to 60°C (standard models)
MountingDIN rail mounting
Operating Voltage24V DC or 120/230V AC (varies by model)
Protection ClassIP20 (standard models)
MemoryVaries depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.

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