4 function description, 1 module features, 1 function description – Pilz PSSu E S 4DI User Manual
Page 12: Section 4, Function description, Module features, 4function description
Function description
Operating Manual PSSu E S 4DI(T)
21340EN06
12
4
Function description
4.1
Module features
4.1.1
Function description
Module supply
}
The module supply provides the module with voltage.
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 input devices.
}
The module does not switch the periphery supply.
}
The periphery supply has no current limitation.
Inputs
}
The input status is signalled to the head module via the module bus.
}
The inputs have input filters.
Signal detection at the inputs
}
A signal (“0” signal or “1” signal) is always ignored if it is present for less than the min
imum processing time (see Technical details).
}
A signal is always detected and transmitted to the process image (PII) if it is present for
longer than the maximum processing time plus the scan time of the module bus (t
2
+ t
3
,
see diagram and Technical details).
Timing diagram
Input
PII
t
2
+t
3
t
t
1
t
1
t
2
+t
3
t
1
}
Input: Signal at the input
}
PII: Status of process image (PII)
}
t
1
Minimum processing time (see Technical details)
}
t
2
Maximum processing time (see Technical details)
}
t
3
Cycle time of module bus
Shaded area: Status of process image (PII) undefined.