For your safety
C9900-G05x 7Version: 1.0
2.3 Fundamental safety instructions
The following safety instructions must be followed when handling the compact push-button extensions.
Application conditions
• Do not use the push-button extensions in extreme environmental conditions. Protect the components
against dust, moisture and heat.
• Never use the push-button extensions in potentially explosive atmospheres.
• Never carry out any work on the push-button extensions when they are live. Always switch off the
supply voltage for the device before mounting it, replacing device components or rectifying
malfunctions.
• Never connect the push-button extension during a thunderstorm. There is a risk of electric shock.
• Ensure that the device has a protective and functional earth connection.
Damage to property, loss of data and impairment of functions
• Only make the documented modifications to the hardware and software configurations. Unauthorized
modifications of these configurations can limit the function or lead to damage to property and loss of
data.
• Ensure that only technical personnel trained in control and automation engineering operate the push-
button extensions. Use by unauthorized persons can lead to damage to property and loss of data.
• Protect the power supply cable with a fuse with a max. rating of 16A. The functionality may be
impaired if the fuse rating is too high.
• If it should catch fire, extinguish the push-button extension with powder or nitrogen.
2.4 Operator's obligation to exercise diligence
The operator must ensure that
• the products are used only for their intended purpose (see chapter 2.2 Intended use [}6]).
• the products are only operated in sound condition and in working order.
• the products are operated only by suitably qualified and authorized personnel.
• the personnel is instructed regularly about relevant occupational safety and environmental protection
aspects, and is familiar with the operating instructions and in particular the safety instructions contained
herein.
• the operating instructions are in good condition and complete, and always available for reference at the
location where the products are used.
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