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101

CPU and Input/Output Configuration

6-2

S7-200 Programmable Controller System Manual

C79000-G7076-C233-01

6.1 Local I/O and Expansion I/O

The inputs and outputs are the system control points: the inputs monitor the

signals from the field devices (such as sensors and switches), and the outputs

control pumps, motors, or other devices in your process. You can have local I/O

(provided by the CPU) or expansion I/O (provided by an expansion I/O module):

 The S7-200 CPU provides a certain number of digital local I/O points. For more

information about the amount of local I/O provided by your CPU, refer to the

specifications in Appendix A.

 The S7-200 CPU 222 and CPU 224 support the addition of both digital and

analog expansion I/O. For more information about the capabilities of the

different expansion I/O modules, refer to the specifications in Appendix A.

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 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.

Discrete or digital expansion modules always reserve process-image register

space 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 in reserved bytes are set to zero with each input update cycle.

Analog expansion modules 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.

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