Table of Contents
Advertisement
Module
AI8x12Bit
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 kilohm to 50 kilohm 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 11-4. 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)
AI 8x16Bit
Use in voltage measurement
The "wire break" diagnostics function in HW Config must not be activated when operating the modules with
•
transmitters.
Use in indirect current measurement
When using indirect current measurement, ensure a reliable connection between the sensor resistances and the actual
•
inputs, because a reliable wire break detection cannot be guaranteed in the case of a wire break of individual cables of
this connection.
Use a 250 ohm resistor (measuring range 1 - 5 V) to map the current on a voltage; see figure 11-4.
•
Use in direct current measurement
Suitable Zener diode: BZX85C8v2
•
Circuit-specific additional error: If one module fails, the other may suddenly show an additional error of approx. 0.1%.
•
Load capability of 4-wire transmitters: R
•
(determined for worst case: 1 input + 1 Zener diode at an S7 overload value 24 mA to R
Input voltage in the circuit when operating with a 2-wire transmitter: U
•
(determined for worst case: 1 input + 1 Zener diode at an S7 overload value 24 mA to U
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
4.7 Connecting redundant I/O to the PROFIBUS DP interface
> 610 ohms
B
I/O configuration variants
Order number
6ES7331-7KF02-0AB0
6ES7 331-7NF00-0AB0
= (R
B
E
< 15 V
e-2w
= R
e-2w
* I
+ U
)/I
max
z max
max)
* I
+ U
)
E
max
z max
71
Advertisement
Table of Contents
