S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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we shall explain the steps required for the mechanical assembly of an S7-300.
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Note the installation guidelines and notes on safety in this manual when mounting,
commissioning and operating S7-300 systems.
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S7-300 modules are "Open Components" according to IEC 61131-2 and
EU directive 73/23/EEC (Low-Voltage directive), and to UL/CSA Approval an "open
type".
In order to conform with specifications on safe operation relating to mechanical
strength, inflammability, stability and touch-protection, the following alternative
installation modes are prescribed:
• Installation in a suitable cubicle
• Installation in a suitable cabinet
• Installation in an appropriately equipped and closed operating area
Access to these areas must only be possible with a key or tool. Only trained or
authorized personnel is allowed access to these cubicles, cabinets or electrical
operating rooms.
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