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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
Electrical connection
The AS-i power supply
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5.2
The AS-i power supply
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To operate an AS-i system a special AS-i power supply is required, e.g. AC1236 from
ifm electronic
.
The AS-i power supply supplies the connected slaves with energy via the yellow AS-i cable and at the
same time implements data decoupling from the voltage regulator of the power supply. Standard
switched-mode power supplies do not feature data decoupling and are therefore not suited for use as
AS-i current supply.
In the
ifm
AS-i power supplies the two terminals AS-i+ and AS-i- are designed redundantly, so that
they can additionally be connected to the terminals ASI 1+ and ASI 1- of the gateway without
additional terminals. The same applies to ASI 2+ and ASI 2- for the second AS-i master circuit.
For the operation of the optional second AS-i master a second AS-i power supply is required, because
the two master circuits must be electrically isolated.
NOTE
Overcurrent in case of short circuit!
Risk of damage to devices. In case of short circuits, the AS-i power supply provides the maximum
current.
►
Disconnect the power supply before the device is connected.
NOTE
Interference or corruption of the AS-i signals possible.
When the AS-i power supply is grounded, the signals AS-i+ and AS-i- are no longer symmetrical to the
mass potential of the machine/plant.
►
Do NOT ground the AS-i network.
►
Connect the "Shield" terminal on the AS-i power supply to the machine ground (GND potential) so
that it is well conductive.
