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NOTICE
Non-hot-plug I/O devices
I/O devices that do not support hot-plugging may not be connected until the device is powered
off. Strictly adhere to the specifications in the I/O manuals.
Note
Wait at least ten seconds before you reinsert USB devices.
Note that the EMC immunity of standard USB devices is designed only for office environments.
These USB devices are appropriate for handling commissioning and service tasks. Only
industrial grade USB devices are permitted for use in industrial environments. The USB
devices are developed and marketed by the respective supplier. The respective product
supplier provides support for the USB devices. The manufacturer's terms of liability shall apply.
Note
A monitor should be connected and switched on before device booting to ensure it is correctly
detected and run by the BIOS and the operating system. The screen may otherwise remain
dark.
Note
The connected or built-in I/Os should not introduce a counter emf into the device.
A counter e.m.f. greater than 0.5 V to ground on the + 3.3 V DC / + 5 V DC / + 12 V DC 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.
● During the measurement, all cables from the plant to the computer should be connected.
● All other components in the plant must be active.
8.8
Power supply X80
8.8.1
Properties
This interface is provided exclusively for connection of the external power supply.
Note
When using external power supplies (e.g. SITOP), the ground potential must be connected with
the protective ground terminal (PELV).
MCU 1720
Equipment Manual, 09/2019, A5E47437728B AB
Connecting
8.8 Power supply X80
65
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