Siemens SIMATIC S7-400H Manual page 156

Using I/O on the S7-400H
Input range to be configured
Measuring range cube positioning
switching cond. meas. error 1)
Load for 4-wire-measurement transducer
Input voltage for 2-wire-measurement transdu-
*) 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
• 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:
Current measurement range
Input range to be configured
Resolution
S7 number format
Measurement error caused by circuit
– 2 parallel inputs
– 1 input
"wire break" diagnosis
Load resistance for 4-wire measurement
transducer
*) You may be able to connect the free internal 250 Ohm resistors of the module
7-26
Resistance
Current measuring range
Resolution
S7 number format
– 2 parallel inputs
– 1 input
Diagnostics "wire break"
cer
6ES7 331-7NF00-0AB0
Resistor
50 Ohm
+/–20mA +/–20mA
+/–1V +/–5 V
"A"
12bit+sign 12bit+sign
x
–
–
– –
50 Ohm
> 1,2 V
250 Ohm *)
+/–20mA
+/–5V
15 bits + sign
X
–
–
X
250 Ohm
Automation System S7-400H Fault-tolerant Systems
250 Ohm
4...20mA
1...5V
"B"
12bit
x
0.5%
0.25%
x *)
250 Ohm
>6V
4...20mA
1...5V
15 bits
X
A5E00068197-07