Function description
Operating Manual PSSu E S 2AI RTD(-T)
22017-EN-07
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4
Function description
4.1
Block diagram
Module Bus
Periphery
Supply
+ 24 V DC
Module
Supply
+ 5 V DC
Data
(ST)
Input
11 12
21
22
ADC
13 23
(C-Rail)
J
Input
14 15
24
25
J
16 26
(C-Rail)
4.2
Module features
4.2.1
Integrated protection mechanisms
When the PSSu E F PS1(-T) or PSSu E F PS2(-T)(-R) is used to supply the system, the
module supply is buffered for 20 ms if the supply voltage is interrupted.
The module detects the following errors:
}
Start-up error
}
Configuration error
}
ST communication error
}
Bus termination error
4.2.2
Functions
The module supply provides the module with voltage. The periphery supply provides the
analogue section with voltage.
The input signals are read in and converted into digital signals. The resolution depends on
the configured measuring range. Additional signal processing can be defined using the sys-
tem software (see schematic representation of signal processing). The individual steps are
described in the "Configuration" section.
The input signals are transmitted to the head module via the ST module bus. As an option
the input module can send status information for each input.
All the configuration data is stored in the head module and is assigned to the input module
on restart. This way the configuration data is retained even if you change the input module.
