Siemens SIMATIC S5-115F, User Manual

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Analog Value Processing S5-115F Manual
6.8 I/O Module Types
There are different types of analog I/Os. These types are suited to the type of sensors and
actuators and to the time characteristics of the input/output signals ( 10.11).
A distinction is made between safety-related and nonsafety-related types.
In the case of nonsafety-related types, a further distinction is made between types for intermittent
signals and types for non-intermittent signals.
An analog signal is intermittent if the whole value range relevant to evaluation within the second
error occurrence time is run through, read in and coded at least once. In doing so, it is of special
importance that those values that lead to a safety response be reached.
For example, an analog input for measuring temperature cannot generally be configured as an
intermittent type since the critical temperatures leading to emergency shutdown are never
reached in normal operation.
Note
If an intermittent type is selected for a safety-related signal, this signal characteristic
must be proved to the licensing authority.
This characteristic is often impossible or difficult to prove. If this is the case, a non-
intermittent type should be selected for which no special proof is required.
When configuring I/O modules, define an I/O type for each AI word according to the
characteristics of the process signals. There are four different I/O types for analog input modules.
( Table 6.15)
Table 6-15. Types of Analog I/O Modules
AI=Analog input
AQ=Analog output
I/O Type
No. I/O Safety-
related AI
Module No. of I/O
Channels
No. of
Sensor/
Actuator
Channels
Inter-
mittent
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
13
14
15
16
16 AI
AI
AI
AI
AI no
yes
yes
yes
yes
460/463
463
463
463
463
1
2
2
2
2 1
1
2
1
2 -
non-interm.
non-interm.
interm.
interm.
18 AQ no 470 1 1 -
I/O types differ according to
•
Safety-related aspects
• Number of I/O channels
• Type of connection
• ”Intermittent” characteristic
• Feedback type
• Number of feedback channels.
EWA 4NEB 811 6148-02
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