S5-90U/S5-95U
Installation Guidelines
3.4
Electrical Configuration with External I/Os
3.4.1
Electrical Configuration of the S5-90U with External I/Os
Figure 3-26 shows a possible configuration.
Pay attention to the following points when you design
your configuration.
•
You must have a main switch (1) in accordance with VDE 0100 for your PLC, the sensors, and
the actuators.
•
You do not need an additional fuse (2) to connect your PLC and the load circuit to power if your
radial lines are a maximum of 3 meters (9.84 feet) long and are inherently earth-fault-proof and
short-circuit-proof.
•
You should ground the load circuit at one end.
Provide a removable connection (3) to the
ground conductor on the load power supply (terminal M) or on the isolating transformer.
You must provide earth-fault monitoring for any non-grounded load circuits.
•
You must separately fuse (4 and 5) the load voltage for sensor circuits and for actuator circuits.
•
Sensors and actuators can be supplied with 24 V DC/300 mA via the IM 90 (8). Connect the
ground of the IM 90 power supply with the standard mounting rail (PE) (9).
•
You must have a low-resistance connection between the standard mounting rail and the
cabinet's chassis ground (7) for grounded configuration.
•
You need a power fuse (6) to protect against a short-circuit occurring in the power supply.
•
The IM 90 interface module has its own monitor for the supply voltage. When it reports a power
failure to the S5-90U, the PLC goes into the "STOP" mode with the "NAU" error message
(power failure). For this reason, it is recommended that you wire the S5-90U and the IM 90
interface module to the main power line in unison.
EWA 4NEB 812 6115-02b
3-25
Содержание SIMATIC S5-90U
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