Mounting and connecting the device
3.3 Connecting the device
SIMATIC IPC677D
42 Operating Instructions, 09/2014, A5E32995420-AC
Make sure that the ON/OFF switch is in the pos
i-
tion "0" (OFF) to prevent unintentional startup of
the device when
it is connected to the 24 V power
Switch off the external 24 V DC power supply.
Connect the 24 VDC plug connector to the device.
Observe the correct polarity of the contacts:
DC 24 V
ground
protective conductor
If necessary, install the enclosed cable grip.
VDC cable to the cable grip using a
Note
Reverse-polarity protection
The DC power supply (24V) has a mechanism to protect against reverse polarity. In the
event that the 24 VDC lines are
reversed (24 VDC nominal (-20% / +20%) and connected to
ground, the device will not be damaged. The device will simply fail to turn on. After the power
supply has been connected correctly, the device will again be ready to operate.
General technical specifications (Page 121)
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