Electrical Potentials For The Onboard And External I/Os; Onboard I/Os Of The S5-95F Programmable Controller - Siemens SIMATIC S5-95F Manual

Expansion of Basic System with External I/Os
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.
Internal voltage controller
L+
M
PE
Figure 5-21. Simplified Representation of the Electrical Potentials for the Basic Unit
5-24
Onboard DI/DQ
1
L+
10
L+
M
1
11
V
intern.
M
1
20
M
intern.
M = Reference potential of the internal logic
intern.
M = Reference potential of the onboard DI/DQ
1
M = Reference potential of the counter/interrupts inputs
2
M
1
Serial interface
Interrupt/counter
interface
L+
1
M
2
2
M
M
2
2
20
3
S5-95F
I/O bus
9 V DC
intern.
M
intern.
EWA 4NEB 812 6210-02