Important Notes On Safety - Siemens SIMATIC S5 Manual

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Important Notes on Safety

Note
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Before starting up the system, the plant must be equipped with emergency stop
limit switches , which directly affect the power supply.
If the plant is operated from the PG, the emergency stop switch, to switch off the
whole plant must be accessible from the PG.
If the positioning module is linked into the programmable controller, an emer-
gency stop switch must be integrated in the control panel used for operation.
Despite extensive measures both in development and production to achieve the high reliability
of S1 MATIC S5, errors can never be completely excluded. Whenever an error could lead to dam-
aged equipment or even personal injury, all measures must be taken to ensure a safe configura-
tion according to the pertinent regulations.
The commissioning and starting up of a drive always demands particular care, The possibility
that the drive might start moving unexpectedly for whatever reason can never be fully excluded.
Such a movement can, for example, result from accidental triggering of commands or from
faults in the electronics.
To be able to stop the, in some cases, enormous energy of a moving drive, emergency stop limit
switches at the ends of the traversing range, which switch off the power supply directly, must al-
ways be present, Depending on the type of drive, these limit switches must also be combined
with mechanical brakes and buffers to prevent any possible damage.
The positioning module has inputs for two limit switches for each axis, however, these can never
be a substitute for emergency stop limit switches directly connected to the power supply.
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