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Hello, 

I intended  gap addressing as in figure 4-11 

 Hello,

Please have a look:

Which addresses do the inputs/outputs of the S7-200 expansion ...

Hello,

From System manual above Fig 4-11

Addressing the Local and Expansion I/O

The local I/O provided by the CPU provides a fixed set of I/O addresses. You can add I/O points to

the S7-200 CPU by connecting expansion I/O modules to the right side of the CPU, forming an I/O

chain. The addresses of the points of the module are determined by the type of I/O and the

position of the module in the chain, with respect to the preceding input or output module of the

same type. For example, an output module does not affect the addresses of the points on an input

module, and vice versa. Likewise, analog modules do not affect the addressing of digital modules,

and vice versa.

Tip

Process-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. For input modules, the

unused bits are set to zero with each input update cycle.

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.

Hello,

How to explain: the addresses are fixed

e.g: if after the CPU you have an analog module 4AI...  the address always starts from AIW4 and not from AIW0 because it is reserved for the CPU with analog inputs

Hello,

simply you can look to menu PLC->Information, there you can see addresses of modules, occupation of areas.

Hello Ste39,

Hello William,

 I have confused      

Can you give us a rule?

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Hello Ste39,

Hello William,

 I have confused      

Can you give us a rule?

 Hello,

 sorry if I have explained myself badly  If you have a CPU without analog I/O the expansion will start from AIW0 

Hello Ste39,

What about the CPU or analog modules have 1 signal only?

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Hello Ste39,

What about the CPU or analog modules have 1 signal only?

 Hello,

only XP CPU has  analog onboard so, with XP CPU will start with AIW0 and since have 2 analog input the expansion will start from AIW4 like explain above if you have 22x CPU that no have analog onboard

the expansion will start from AIW0

Hello,

How can we know the 2nd address not used in XP CPU?