S5-95F
Expansion of Basic System with External I/Os
5.7
Power Supplies for the S5-95F
The control for the S5-95F consists of several electrical circuits:
•
Internal control circuits for the S5-95F (24 V DC)
•
Control circuit for the onboard DI/DQ logic (24 V DC)
•
Control circuit for the counter and interrupt logic (24 V DC)
•
Sensor circuits (24 V DC for onboard I/Os) and
•
Load circuits for the actuators (24 V DC for onboard I/Os)
Internal Control Circuits
The internal control circuits for the S5-95F have a common reference potential. They include:
programmer interface, supply of the bus units and the control circuits for the external I/Os. The
internal control circuits are supplied via the 24 V DC feeder on the basic unit.
Control Circuit for the Onboard DI/DQ Logic
The control circuit for the onboard DI/DQ logic has its own reference potential and is galvanically
isolated from the other circuits. You must supply this circuit with 24 V DC.
Control Circuit for the Counter and Interrupt Logic
The control circuit for the counter and interrupt logic has its own reference potential and is
galvanically isolated from the other circuits. You must supply this circuit with 24 V DC.
Sensor Circuits
The sensor circuits supply the sensors for the onboard and external digital input modules.
Depending on the digital input module used, you can have 24 V DC, 120 V AC and 230 V AC
sensor circuits (input circuits).
Load Circuits
The load circuits supply the actuators of the process I/Os. Depending on the digital output module
used, you can have 24 V DC, 115 V AC and 230 V AC load circuits (output circuits).
Requirements for 24 V DC Supplies
You must supply all 24 V DC circuits from electrically isolated power supplies to DIN VDE 0551 or
EN 60742 and DIN VDE 0160 (see section 4.1.2).
Make sure that the voltage lies between 20 to 30 V (including ripple).
The AC ripple content must not exceed ±1.2 V.
Note
If you use a switched-mode power supply unit to supply floating analog modules and
BEROs, then this supply must be filtered through a network.
EWA 4NEB 812 6210-02
5-23
