How is the module address of Siemens PLC distributed? -Solutions - Huaqiang Electronic Network

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1. How many bits does the first module occupy? Is it 8 bits or is it allocated by the maximum number of 16 bits?

It is 8 digits.

2. Does the first module occupy 32 addresses?

In the S7-300, if it is specified by the system, it is not 32 points. It is 8 o'clock. It is another matter if the user defines it himself.

S7-200 address allocation principle (specified by the system):

The I/O addresses on the S7-200 expansion modules are arranged in increasing distance from the CPU. The closer to the CPU, the smaller the address number.

Between modules, the address of a digital signal is always incremented by 8 bits (1 byte). If the physical input point on the CPU does not occupy exactly one byte, the remaining unused bits cannot be assigned to the same type of signals of subsequent modules.

The analog output module always takes up the output address of both channels. Even though some modules (EM235) have only one actual output channel, it takes up the address of both channels.

When the programming computer and the CPU are actually connected, use the Micro/WIN menu command "plc>Information" to view the actual I/O address assignment of the CPU and expansion modules.

In addition to the digital and analog I/O expansion modules occupying input/output addresses in the S7-200 system, some intelligent modules (special function modules) also need to occupy addresses in the address range. These data addresses are used by the module for functional control and are generally not directly connected to external signals.

The S7-300 address can be specified by the system and can be defined by the user.