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
191
Library V5.x Library V4.x Library V3.x Module
Order number
Distributed: Redundant AI dual-channel
AI8x12Bit
6ES7331–7KF02–0AB0
X
X
Use in voltage measurement
The "wire break" diagnostics function in HW Config must not be activated,
neither when operating the modules with transmitters nor when
thermocouples are connected.
Use for indirect current measurement
When determining the measuring error, observe the following: The total input
resistance in measuring ranges > 2.5 V is reduced from a nominal 100 kOhm
to 50 kOhm when operating two inputs connected in parallel.
The "wire break" diagnostics function in HW Config must not be activated,
neither when operating the modules with transmitters nor when
thermocouples are connected.
Use a 50 ohm resistor (measuring range +/- 1 V) or 250 ohm resistor
(measuring range 1 - 5 V) to map the current on a voltage, see figure 10-9.
The tolerance of the resistor must be added on to the module error.
This module is not suitable for direct current measurement.
Use of redundant encoders:
You can use a redundant encoder with the following voltage settings:
+/- 80 mV (only without wire break monitoring)
+/- 250 mV (only without wire break monitoring)
+/- 500 mV (wire break monitoring not configurable)
+/- 1 V (wire break monitoring not configurable)
+/- 2.5 V (wire break monitoring not configurable)
+/- 5 V (wire break monitoring not configurable)
+/- 10 V (wire break monitoring not configurable)
1...5 V (wire break monitoring not configurable)
