Using I/O on the S7-400H
7-26
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Resistance 50 Ohm 250 Ohm
Current measuring range +/–20mA +/–20mA 4...20mA
Input range to be configured +/–1V +/–5 V 1...5V
Measuring range cube positioning “A” “B”
Resolution 12bit+sign 12bit+sign 12bit
S7 number format x x
switching cond. meas. error 1)
– 2 parallel inputs
– 1 input
–
–
0.5%
0.25%
Diagnostics “wire break” – – x *)
Load for 4-wire-measurement transducer 50 Ohm 250 Ohm
Input voltage for 2-wire-measurement transdu-
cer
> 1,2 V >6V
*) The AI 8x12bit outputs diagnostic interrupt and measuring value “7FFF” in the event of wire
break
The listed measurement error is caused only by the connection of one or two
inputs to a shunt resistor. Neither the resistance tolerance, nor the basic /
operational error limits of the modules are here taken into account.
The measurement error at one or two inputs indicates the difference in the
measurement result, depending on whether one or two inputs record the current of
the measurement transducer when an error occurs.
AI 8x16bit 6ES7 331-7NF00-0AB0
• 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 250 Ohm shunt resistor for voltage measurements:
Resistor 250 Ohm *)
Current measurement range +/–20mA 4...20mA
Input range to be configured +/–5V 1...5V
Resolution 15 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
250 Ohm
*) You may be able to connect the free internal 250 Ohm resistors of the module
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