Rear View - Siemens SIMATIC Rack PC 840 Manual

Welcome to the SIMATIC Rack PC 840
2.4

Rear View

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Figure 2-4 Rear View
1 Power Supply Fan
Here are openings for power supply ventilation.
Caution
The air venting slots for outgoing air must not be obstructed. Otherwise, there is a
risk of overheating.
2 Power Supply
Appliance socket for AC power supply or screw terminal for DC power supply.
3 Equipotential Grounding
The connection with the equipotential grounding on the system housing to the
central earth terminal of the cabinet or the unit into which the computer is fitted,
ensures that faults arising from external power supply cables, signalling cables or
cables to peripheral units are diverted.
4 Rear Drive Fan (opcional)
Here are openings for device ventilation.
5 COM1
The COM 1 (TTY) port is used to connect, for example, S5 automation units (AG).
The supplied adapter can be used to convert the port into a 25-pole standard V.24
port for connecting serial port devices such as modem, mouse or printer. Refer to
Section 4.3 of the electronic manual. The line current (TTY) is an optional product
feature.
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SIMATIC Rack PC 840 Manual
A5E00104826-03
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