Measuring range adjustment
• Disable

measuring range
greater than lower
limit
High limit Yes Channel Channel 4)
• Measuring range adjustment
low limit (mV
or µA)
Value within the
nominal range of the
measuring range
smaller than high
limit
Low limit Yes Channel Channel 4)
• Scaled high nominal
range limit
Scale
• High limit
• Low limit
High limit Yes Channel ---
• Scaled low nominal
range limit
Scale
• High limit
• Low limitHardware interrupt high
limit 1
Yes/No No Yes Channel --- 4)
• Hardware interrupt low
limit 1
Yes/No No Yes Channel --- 4)
• Hardware interrupt high
limit 2
Yes/No No Yes Channel --- 4)
• Hardware interrupt low
limit 2
Yes/No No Yes Channel --- 4)
1) If you enable diagnostics for multiple channels, you will receive an alarm surge on failure of the supply voltage because
each enabled channel will detect this fault.
You can prevent this message burst by assigning the diagnostics function to one channel only.
2) When "Wire break" diagnostics is disabled, the current limit of 1.185 mA applies to the value status. For measured
values below 1.185 mA, the value status is always: 0 = fault.
3) You can set the effective range of the diagnostics for each channel in the user program with data records 0 to 7.
4) You can set the current limit for wire break diagnostics, the "Hardware interrupt" parameter, the "Measuring range adjustment
high and low limit" and the hardware interrupt limits in the user program with data records 0 to 7.nabling of the diagnostics, with missing or too little supply voltage L+.
Overflow
Enabling of the diagnostics if the measured value violates the high limit.
Underflow
Enabling of the diagnostics if the measured value violates the low limit.
Wire break
Enabling of the diagnostics if the module has no current flow or the current is too weak for
the measurement at the corresponding configured input or the applied voltage is too low.
Current limit for wire break diagnostics
Threshold for reporting wire breaks. The value can be set to 1.185 mA or 3.6 mA, depending
on the sensor used.
Interference frequency suppression
Suppresses the interference affecting analog input modules that is caused by the frequency
of the AC voltage network used.
The frequency of the AC voltage network can negatively affect the measured value, in
particular when measuring in low voltage ranges and with thermocouples. With this
parameter, the user specifies the line frequency that is predominant in the plantThe individual measured values are smoothed using filtering. The smoothing can be set in 4
levels.
Smoothing time = number of module cycles (k) x cycle time of the module.
The following figure shows after how many module cycles the smoothed analog value is
almost 100%, depending on the set smoothing. Is valid for each signal change at the analog
input.Specifies the low limit threshold that triggers hardware interrupt 1 or 2.
High limit 1 or 2
Specifies the high limit threshold that triggers hardware interrupt 1 or 2.You can use this parameter to determine the operating mode for the module.
● Fast mode; easy integration time with less frequency suppression (minimal integration
time 2.5 ms)
● Standard mode; triple integration time with higher frequency suppression (minimal
integration time 7.5 ms)With this parameter, you specify the high limit of the measuring range.
Measuring range adjustment low limit
With this parameter, you specify the low limit of the measuring range.
Scaled high nominal range limit
With this parameter, you set the desired display value (in REAL) for the high nominal range
limit of the measuring range.
Scaled low nominal range limit
With this parameter, you set the desired display value (in REAL) for the low nominal range
limit of the measuring rangThe module can be configured differently in STEP 7; see following table. Depending on the
configuration, additional/different addresses are assigned in the process image of the inputs.
Configuration options of AI 8xU/I HF
You can configure the module with STEP 7 (TIA Portal) or with a GSD file.
When you configure the module by means of the GSD file, the configurations are available
under different abbreviations/module names.
The following configurations are possible: x 8-channel without value status AI 8xU/I HF X X
1 x 8-channel with value status AI 8xU/I HF QI X X
8 x 1-channel without value status AI 8xU/I HF S X
(PROFINET IO only)
X
(PROFINET IO only)
8 x 1-channel with value status AI 8xU/I HF S QI X