Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
S7-400H
190
System Manual, 03/2012, A5E00267695-11
Library V5.x Library V4.x Library V3.x Module
Order number
Central: Redundant AI dual-channel
AI 16x16Bit
6ES7431–7QH00–0AB0
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 in indirect current measurement
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.
Use in direct current measurement
Suitable Zener diode: BZX85C6v2
Load capability of 4-wire transmitters: R
B
> 325 ohms
(determined for worst case: 1 input + 1 Zener diode at an S7 overload value
24 mA to R
B
= (R
E
* I
max
+ U
z max
)/I
max)
Input voltage in the circuit when operating with a 2-wire transmitter: U
e-2w
< 8
V
(determined for worst case: 1 input + 1 Zener diode at an S7 overshoot value
24 mA to U
e-2w
= R
E
* I
max
+ U
z max
)
Note: The circuit shown in figure 10–10 works only with active (4-wire)
transmitters or with passive (2-wire) transmitters with external power supply.
Always parameterize the module channels for operation as "4-wire transmitter",
and set the measuring range cube to position "C".
It is not possible to power the transmitters via the module (2DMU).
Содержание SIMATIC S7-400H
Страница 24: ...Preface 1 1 Preface S7 400H 24 System Manual 03 2012 A5E00267695 11 ...
Страница 46: ...Getting Started 4 5 Special layout features of SIMATIC Manager S7 400H 46 System Manual 03 2012 A5E00267695 11 ...
Страница 120: ...Memory concept 10 1 Overview of the memory concept of S7 400H CPUs S7 400H 120 System Manual 03 2012 A5E00267695 11 ...
Страница 258: ...Communication 14 8 General issues regarding communication S7 400H 258 System Manual 03 2012 A5E00267695 11 ...
Страница 354: ...Synchronization modules 18 3 Selecting fiber optic cables S7 400H 354 System Manual 03 2012 A5E00267695 11 ...
Страница 434: ...Technical data 20 6 Runtimes of the FCs and FBs for redundant I Os S7 400H 434 System Manual 03 2012 A5E00267695 11 ...
Страница 460: ...Function modules and communication processors supported by the S7 400H S7 400H 460 System Manual 03 2012 A5E00267695 11 ...