Using I/O on the S7-400H
7-27
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
AI 16x16bit 6ES7 431-7QH00-0AB0
• For voltage measurements: The “wire break” diagnostic function may not be
enabled in HW Config when the module is operated with measurement
transducers or thermocouples
• You can use a 50 Ohm or 250 Ohm shunt resistor for voltage measurements:
Resistor 50 OHM 250 Ohm *)
Current measurement range +/–20 mA +/–20 mA 4...20 mA
Input range to be configured +/–5 V +/–5 V 1...5 V
Measurement range selector position A A
Resolution 15 bits + sign bits + sign 15 bits
S7 number format X
Measurement error caused by circuit
– 2 parallel inputs – –
– 1 input – –
“wire break” diagnosis X x
Load resistance for 4-wire measurement
transducer
50 Ohm 250 Ohm
Input voltage for 2-wire measurement
transducer
> 1.2 V >6 V
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