Siemens SIMATIC S7 System Manual page 48

Installation
3.1 Guidelines for installing S7-200 SMART devices
Provide adequate clearance for cooling and wiring
S7-200 SMART devices are designed for natural convection cooling. For proper cooling, you
must provide a clearance of at least 25 mm above and below the devices. Also, allow at
least 25 mm of depth between the front of the modules and the inside of the enclosure.
Temperature considerations
Vertical mounting reduces the maximum allowable ambient temperature by 10 degrees C.
Operating outside the maximum temperature range could result in erratic process operation
and could result in minor personal injury.
If your installation includes expansion modules, mount the CPU below them as shown in
the following figure. Follow the prescribed guidelines for mounting modules to ensure
proper cooling.
①
②
When planning your layout for the PLC, allow enough clearance for the wiring and
communications cable connections.
48
CAUTION
Side view
Horizontal installation
③
Vertical installation
④
Clearance area
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART