Siemens CPU 313C Hardware And Installation Manual page 28

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The modules that make up an S7-300 are regarded as open equipment. This
means that you must always install the S7-300 in a cubicle, cabinet or electrical
control room that can only be accessed using a key or tool. Only trained or
authorized personnel are allowed access to such cubicles, cabinets or electrical
operating rooms.
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Depending on the field of application, the operation of an S7-300 in a plant or
system is defined by special rules and regulations . Note the safety and accident
prevention regulations relating to specific applications, e.g. machine protection
directives. This chapter and the appendix *HQHUDO UXOHV DQG UHJXODWLRQV RQ 6
RSHUDWLRQ provide an overview of the most important rules you need to consider
when integrating an S7-300 into a plant or a system.
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An S7-300 PLC consists of a central unit (CU) and – if required – one or multiple
expansion modules (EMs).
The rack containing the CPU is referred to as the central unit (CU). Racks
equipped with modules form the expansion modules (EMs) connected to the
system's CU.
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You can use EMs if the number of CU slots is insufficient for your application.
When using EMs, you might require further power supply modules in addition to
the extra racks and interface modules (IM). When using interface modules you
must ensure compatibility of the partner stations.
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The rack for your S7-300 is a rail. You can use this rail to mount all modules of
your S7-300 system.
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03