Function description
Operating Manual PSSu E S 4DO 0.5-(T)D
21951-EN-07
12
4
Function description
4.1
Block diagram
Module Bus
Periphery
Supply
+ 24 V DC
Module
Supply
+ 5 V DC
Data
(ST)
0 V
11 12
0 V
21 22
0 V
14 13
0 V
24 23
13 23
(C-Rail)
4.2
Module features
4.2.1
Functions
Module supply
}
The module supply provides the module with voltage.
Signals at the output
}
"0" signal (0 V) at the output:
– Output is high impedance
– No current to the load
}
"1" signal (+24 V) at the output:
– Output is low impedance
– Current is supplied to the load
Periphery supply
}
The module routes the periphery supply from the module bus to the base module ter-
minals.
}
The periphery supply is used to supply the outputs.
Outputs
}
The head module sets the output status via the module bus.
The module provides advanced diagnostic data, which is also available in a status byte in
the ST-PII (not in system environment B):
}
Output overload/short circuit
}
Excess module temperature
