Table of Contents
Advertisement
Function description
4
Function description
4.1
Block diagram
4.2
Functions
Module supply
}
The module supply provides the module with voltage.
Periphery supply
}
The module switches the periphery supply from the module bus to the base module ter-
minals.
}
The periphery supply is used to supply or provide test pulses to the input devices.
Inputs
}
The input status is signalled to the head module via the module bus.
}
Test pulses can be used to check the inputs for shorts across contacts and correct
functionality.
}
The inputs have input filters.
Test pulse outputs
}
2 test pulse outputs that use different test pulses (test pulse 0, test pulse 1)
}
Short circuit-proof
}
Current limitation
}
Test pulses can be switched on or off.
}
Test pulses are switched on in the default setting.
}
When test pulses are switched off, the periphery supply is constantly available at the
outputs.
Detection of shorts across contacts
}
The test pulses are used to detect shorts between inputs. Shorts between inputs are
detected when
–
Operating Manual PSSu E F 4DI(-T)(-R),
21310-EN-08
Periphery
Supply
+ 24 V DC
Module
Supply
+ 5 V DC
Data
(FS)
the test pulses are different (test pulse 0, test pulse 1) or when
11
12
21
22
14
13
Input
Input
Input
24
23
Input
12
Advertisement
Table of Contents
