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SIMATIC 545/555/575 System Manual

Pre-installation Guidelines

2.2 Safety Considerations

Pre-installation planning and site preparation must include consideration of

hazards to personnel in the event of a system failure. The equipment

connected to the control system must include interlocks and safety switches

to help prevent operation during a system failure. Although the specific

steps depend on the application, the general precautions include the

following considerations.

WARNING

Control devices can fail in an unsafe condition. Unless proper safeguards are

incorporated by the user, malfunctions of these devices could lead to sudden

equipment startup or shutdown. Failure can also be exhibited as erratic or

unexpected operation.

Such startup or shutdown or unexpected operation could result in death or

serious injury to personnel, and/or damage to equipment.

If you, or your company, use any programmable controllers with equipment

which requires an operator or attendant, you should be aware that this potential

safety hazard exists, and take appropriate precautions.

The precautions below conform to the National Electrical Manufacturers

Association guidelines for installation of programmable controllers as

recommended in the NEMA ICS 3–304 Programmable Control Standards.

ICS 3-304.81 Safety Recommendations:

Consideration should be given to the use of an emergency stop function

which is independent of the programmable controller.

Where the operator is exposed to the machinery, such as in loading or

unloading a machine tool, or where the machine cycles automatically,

consideration should be given to the use of an electromechanical override or

other redundant means, independent of the programmable controller, for

starting and interrupting the cycle.

If provision is required for changing programs while the equipment is in

operation, consideration should be given to the use of locks or other means of

assuring that such changes can be made only by authorized personnel.

These recommendations are intended as safeguards against the failure of

critical components and the effects of such failures or the inadvertent errors

that might be introduced if programs are changed while the equipment is in

operation.

The ICS 3-304.81 Safety Recommendations from NEMA ICS 3-304, Programmable Controller

Standard. Recommendations are reproduced by permission of the National Electrical

Manufacturers Association.

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Siemens SIMATIC TI500 Especificaciones Pagina 38