General Technical Specifications
1-9
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Storing backup batteries
Backup batteries must be stored in a cool and dry place. The maximum shelf life is
5 years.
!
Warning
Improper handling of backup batteries can result in injury and damage to property.
If backup batteries are not treated properly, they can explode and cause severe
burning.
Observe the following rules when handling backup batteries used in the S7-300
programmable logic controller:
• never charge them
• never heat them
• never throw them in the fire
• never damage them mechanically (drill, squeeze, etc.)
1.4 Mechanical and Climatic Environmental Conditions for
Operating S7-300s
Operating conditions
S7-300 systems are intended for stationary use in locations protected against the
weather. The operating conditions surpass the requirements of DIN IEC 60721-3-3.
• Class 3M3 (mechanical requirements)
• Class 3K3 (climatic requirements)
Use with additional measures
The S7-300, for example, must not be used without taking additional measures:
• in locations exposed to a high degree of ionizing radiation
• in hostile environments caused, for instance, by
– dust accumulation
– corrosive vapors or gases
– strong electric or magnetic fields
• in installations requiring special monitoring, for example
– elevators
– electrical installations in particularly hazardous areas
An additional measure might be, for instance, installation of the S7-300 in a cabinet
or in a housing.
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