SIMATIC Box PC 827B
Getting Started, 07/2008, A5E01127540-02
25
Connecting
5
5.1
Connecting peripherals
Note before connecting
NOTICE
Connect only peripheral devices approved for industrial applications to EN 61000-6-2:2005.
Note
Hot-plug peripheral devices (USB) may be connected while the PC is in operation.
CAUTION
Peripheral devices that are incapable of hot-plugging may only be connected after the
device has been disconnected from the power supply.
CAUTION
Strictly adhere to the specifications in the manuals for the peripheral devices.
NOTICE
The connected or built-in peripherals should not introduce a counter emf into the device.
A counter emf greater than 0.5 V to ground on the + 3.3 VDC / + 5 VDC / + 12 VDC power
rail due to a connected or integrated component can prevent normal operation or even
destroy the computer.
When measuring the counter emf, remember the following:
•
The computer in question must be turned off and the power supply connector should be
plugged in.
•
During the measurement, all cables from the plant to the computer should be
connected.
•
All other components in the plant must be active.
