Siemens SIMATIC S7-400H System Manual page 194

Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
Library V5.x Library V4.x Library V3.x Module
Distributed: Redundant AO dual-channel
X
X X
X
X X
NOTICE
You need to install the F ConfigurationPack for F modules.
The F ConfigurationPack can be downloaded free of charge from the Internet.
You can get it from Customer Support at:
http://www.siemens.com/automation/service&support.
Quality levels in the redundant configuration of signal modules
The availability of modules in the case of an error depends on their diagnostics possibilities
and the fine granularity of the channels.
Using digital input modules as redundant I/O
The following parameters were set to configure digital input modules for redundant
operation:
● Discrepancy time (maximum permitted time in which the redundant input signals may
● Response to a discrepancy in the input values
First, the input signals of the paired redundant modules are checked for consistency. If the
values match, the uniform value is written to the lower memory area of the process input
image. If there is a discrepancy and it is the first, it is marked accordingly and the
discrepancy time is started.
During the discrepancy time, the most recent matching (non-discrepant) value is written to
the process image of the module with the lower address. This procedure is repeated until the
values once again match within the discrepancy time or until the discrepancy time of a bit
has expired.
If the discrepancy continues past the expiration of the configured discrepancy time, an error
has occurred.
194
X AO4x12 Bit
X AO8x12 Bit
X AO4x0/4...20 mA [EEx ib]
You cannot use the module for applications in hazardous areas in redundant
mode.
X AO 8x0/4...20mA HART
A firmware update is not possible in redundant mode.
Online calibration is not possible in redundant mode.
Distributed I/O Device ET 200M; HART Analog Modules
See
differ). The configured discrepancy time must be a multiple of the update time of the
process image and therefore also the basic conversion time of the channels.
When there is still a discrepancy in the input values after the configured discrepancy time
has expired, an error has occurred.
Order number
6ES7332–5HD01–0AB0
6ES7332–5HF00–0AB0
6ES7332–5RD00–0AB0
6ES7 332–8TF01-0AB0
manual
System Manual, 03/2012, A5E00267695-11
S7-400H