Siemens SIMATIC S7-400H - Page 193

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
193
Library V5.x Library V4.x Library V3.x Module Order number
AI 6xTC 16Bit iso, 6ES7331-7PE10-0AB0 6ES7331-7PE10-0AB0
X X
Notice: These modules must only be used with redundant encoders.
You can use this module with Version 3.5 or higher of FB 450 "RED_IN" in the
library "Redundant IO MGP" and Version 5.8 or higher of FB 450 "RED_IN" in
the library "Redundant IO CGP" V50.
Observe the following when measuring temperatures by means of
thermocouples and parameterized redundancy:
The value specified in "Redundancy" under "Tolerance window" is always based
on 2764.8 °C. For example, a tolerance of 27 °C is checked if "1" is entered, or a
tolerance of 138 °C is checked if "5" is entered.
A firmware update is not possible in redundant mode.
Online calibration is not possible in redundant mode.
Use in voltage measurement
 The "wire break" diagnostics function in HW Config must not be activated
when operating the modules with thermocouples.
Use in indirect current measurement
 Due to the maximum voltage range +/- 1 V, the indirect current measurement
can be carried out exclusively via a 50 ohm resistor. Mapping that conforms
to the system is only possible for the area +/- 20 mA.
AI 4x15Bit [EEx ib] 6ES7331-7RD00-0AB0 X X
You cannot use the module for applications in hazardous areas in redundant
mode.
It is not suitable for indirect current measurement.
Use in direct current measurement
 Suitable Zener diode: BZX85C6v2
 Load capability of 4-wire transmitters: RB > 325 ohms
determined for worst case: 1 input + 1 Zener diode at an S7 overshoot value
24 mA to RB = (RE * I
max +
U
z max
)/I
max
 Input voltage for 2-wire transmitters: Ue–2w < 8 V
determined for worst case: 1 input + 1 Zener diode at an S7 overshoot value
24 mA to Ue–2w = RE * I
max
+ U
z max
Note: You can only connect 2-wire transmitters with a 24 V external supply or 4-
wire transmitters. The internal power supply for transmitters cannot be used in
the circuit shown in figure 8-10, because this outputs only 13 V, and thus in the
worst case it would supply only 5 V to the transmitter.
AI 6x13Bit 6ES7 336–1HE00–0AB0 X X
F module in standard mode
AI 8x0/4...20mA HART 6ES7 331–7TF01-0AB0 X X X
A firmware update is not possible in redundant mode.
Online calibration is not possible in redundant mode.
See Distributed I/O Device ET 200M; HART Analog Modules manual