Expansion of Basic System with External I/Os S5-95F
5.8 Electrical Potentials for the Onboard and External I/Os
5.8.1 Onboard I/Os of the S5-95F Programmable Controller
The onboard I/Os of the S5-95F are galvanically isolated from the control circuit by optocouplers and
allow a floating configuration.
The onboard I/Os are electrically subdivided into several groups:
• 1 group with 16 failsafe inputs
• 1 group with 8 failsafe outputs
• 1 group with 4 non-failsafe outputs
• 1 group with 4 failsafe interrupt inputs and 2 failsafe counters
Each group has its own 24 V DC connection.
Figure 5-21. Simplified Representation of the Electrical Potentials for the Basic Unit
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Internal voltage controller
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Interrupt/counter
interface
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M
intern.
= Reference potential of the internal logic
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M
1
= Reference potential of the onboard DI/DQ
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M
2
= Reference potential of the counter/interrupts inputs
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5-24
EWA 4NEB 812 6210-02
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