Siemens SIMATIC S7-400H - Page 201

Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
S7-400H
System Manual, 03/2012, A5E00267695-11
201
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 250 ohms *)
Current measuring range +/-20 mA 4...20 mA
Input range to be parameterized +/-5 V 1...5 V
Resolution 15 bits + sign 15 bits
S7 number format x
Circuit-specific measuring error
- 2 parallel inputs
- 1 input
-
-
"Wire break" diagnostics - x
Load for 4-wire transmitters 250 ohms
Input voltage for 2-wire transmitters > 6 V
*) It may be possible to use the freely connectable internal 250 ohm resistors of the module
AI 16x16bit 6ES7 431–7QH00–0AB0
● Use a 50 ohm or 250 ohm resistor to map the current on a voltage:
Resistor 50 ohms 250 ohms
Current measuring range +/-20 mA +/-20 mA 4...20 mA
Input range to be configured +/-1 V +/-5 V 1...5 V
Measuring range cube position "A" "A"
Resolution 15 bits + sign 15 bits + sign 15 bits
S7 number format x x
Circuit-specific measuring error 1)
- 2 parallel inputs
- 1 input
-
-
-
-
"Wire break" diagnostics - - x
Load for 4-wire transmitters 50 ohms 250 ohms
Input voltage for 2-wire transmitters > 1.2 V > 6 V