Siemens SIMATIC PCS 7 OSx - Minimizing Effects of Electrical Noise; Static Electricity and Lightning

Hardware Overview
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SIMATIC PCS 7 OSx 4.0.0 Hardware (PA RISC)
Avoid sources of electrical noise when installing your system. The main
sources of electrical noise are those devices (and their wiring) that produce
and switch high voltages/currents. T ypical examples include:
• Power lines carrying 480 volts or higher
• Generators
• Electric motors
• Transformers
• Electric welders
• Induction furnaces and heaters
• Power inverters
• Radio transmitters
• W alkie-talkies that generate a signal greater than 50 mV
• Teletypes
Consider the following guidelines when installing your system.
• A void parallel runs of AC cables and signal cables.
• A void running unshielded cables together for long distances.
An electrostatic discharge to magnetic media (for example: hard disk,
diskette, or tape) erases data. The following factors contribute to static
electricity problems.
• Carpeting without anti-static properties or treatment
• Extremely low humidity
• Plastic or vinyl upholstery
• Specific clothing/shoe/carpeting or upholstery combinations
Areas subject to lightning storms may require installation of a lightning
protector , particularly if the building is serviced by aerial power lines or if
the power utility has installed lightning protectors on the primary source.
Minimizing Ef fects
of Electrical Noise
Static Electricity
and Lightning