Siemens SIMATIC PCS 7 System Manual page 82

I/O configuration variants
4.7 Connecting redundant I/O to the PROFIBUS DP interface
Additional conditions for specific modules
AI 8x12bit 6ES7 331-7K..02-0AB0
● Use a 50 ohm or 250 ohm resistor to map the current on a voltage:
Resistor
Current measuring range
Input range to be assigned
Measuring range cube position
Resolution
S7 number format
Circuit-specific measuring error
- 2 parallel inputs
- 1 input
"Wire break" diagnostics
Load for 4-wire transmitters
Input voltage for 2-wire transmitters
*) The AI 8x12bit outputs diagnostic interrupt and measured value "7FFF" in the event of wire break.
The listed measuring error results solely from the interconnection of one or two voltage
inputs with a measure resistance. Allowance has neither been made here for the tolerance
nor for the basic/operational limits of the modules.
The measuring error for one or two inputs shows the difference in the measurement result
depending on whether two inputs or, in case of error, only one input acquires the current of
the transmitter.
AI 8x16bit 6ES7 331-7NF00-0AB0
● Use a 250 ohm resistor to map the current on a voltage:
Resistor
Current measuring range
Input range to be assigned
Resolution
S7 number format
Circuit-specific measuring error
- 2 parallel inputs
- 1 input
"Wire break" diagnostics
Load for 4-wire transmitters
Input voltage for 2-wire transmitters
*) It may be possible to use the freely connectable internal 250 ohm resistors of the module
82
50 ohms 250 ohms
+/-20 mA +/-20 mA *)
+/-1 V +/-5 V
"A" "B"
12 bits + sign 12 bits + sign
x x
- 0.5%
- 0.25%
- -
50 ohms 250 ohms
> 1.2 V > 6 V
250 ohms *)
+/-20 mA
+/-5 V
15 bits + sign
x
-
-
-
250 ohms
> 6 V
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
4...20 mA
1...5 V
12 bits
x *)
4...20 mA
1...5 V
15 bits
x