Analog Modules
4-85
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Limit values should not be set at values higher than the minimum potential limit
values shown in the table below.
Table 4-53 Minimum Possible Upper and Lower Limit Values of SM 331; AI 8 x 16 bits
Measuring Range
Minimum Possible
Upper Limit Value
Minimum Possible
Lower Limit Value
±10 V 11.368 V
31430
7AC6
H
–11.369 V
–31433
8537
H
±5 V 5.684 V
31430
7AC6
H
–5.684 V
–31430
853A
H
1 to 5 V 5.684 V
32376
7E78
H
0.296 V
–4864
ED00
H
0 to 20 mA 22.737 mA
31432
7AC8
H
–3.519 mA
–4864
ED00
H
4 to 20 mA 22.737 mA
32378
7E7A
H
1.185 mA
–4864
ED00
H
±20 mA 22.737 mA
31432
7AC8
H
–22.737 mA
–31432
8538
H
Wire-Break Check
The wire-break check is available for the 1 to 5 V voltage range and the 4 to 20 mA
current range.
The following applies to both measuring ranges:
Enabled wire-break check, the analog input module enters a wire-break in the
diagnosis if a current falls below 3.6 mA (0.9 V).
If you have enabled diagnostic interrupts during configuration, the module
additionally triggers a diagnostic interrupt.
If no diagnostic interrupt has been enabled, the illuminated SF LED is the only
indication of the wire-break and you must evaluate the diagnostic bytes in the user
program.
With a disabled wire-break check and enabled diagnostic interrupt, the module
triggers a diagnostic interrupt when the underflow is reached.
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