Connecting Peripherals - Siemens SIMATIC IPC847D Operating Instructions Manual

Installing and connecting the device
3.3 Connecting the device
3.3.4

Connecting peripherals

Note before connecting
Note
Connect only I/Os approved for industrial applications according to EN 61000-6-2. Shielded
interface cables must be used for interfaces integrated ex factory.
Note
Hot-plug I/O modules (USB) may be connected while the PC is in operation.
NOTICE
I/O devices that are incapable of hot-plugging may only be connected after the device has
been disconnected from the power supply.
Strictly adhere to the specifications in the I/O manuals.
Note
The connected or built-in I/Os 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.
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WARNING
Operating Instructions, 01/2014, A5E32997454-AA
SIMATIC IPC847D