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Product Information
SIMATIC S7-300
Analog Input Module SM 331; AI 8RTD24 Bit
Release
X4
5 6
New Analog Input Module Available
The S7-300 Analog Input Module SM 331; AI 8RTD24 Bit has been added to
the S7-300 family. The order number for this module is 6ES7 331-7PF00-0AB0.
This product information includes details about the characteristics and technical
specifications of analog input module SM 331; AI 8RTD24 Bit. Refer to the
S7-300 Installation and Hardware Manual for more information about the S7-300
product family.
You will also learn:
How to start up analog input module SM 331; AI 8RTD24 Bit
The measuring ranges available for analog input module
SM 331; AI 8RTD24 Bit
How to configure analog input module SM 331; AI 8RTD24 Bit
Additional Assistance
For assistance in answering technical questions, for training on this product, or for
ordering, contact your Siemens distributor or sales office.
Copyright 2000 by Siemens Energy & Automation, Inc.
2807946–0002
Characteristic Features and Technical Specifications of the Analog Input
Module SM 331; AI 8RTD24 Bit
Order No.
6ES7 331-7PF00-0AB0
Characteristic Features
The analog input module SM 331; AI 8RTD24 Bit has the following
characteristic features:
8 differential inputs for resistance thermometers (RTD) in 4 channel groups
Measured-value resolution 23 Bit + sign (independent of integration time)
Fast update mode for up to 4 channels
Arbitrary RTD type selection per channel group
Programmable diagnostics
Programmable diagnostic interrupt
Eight channels with limit monitoring
Programmable limit interrupt
Programmable end of cycle interrupt
Galvanic isolation >500V to CPU
Special Feature
The analog input module SM 331; AI 8RTD24 Bit can only be used in the
ET200M distributed I/O configuration with the following versions of the IM153 (or
later)
IM153-1
6ES7 153-1AA03-0XB0 V.1
IM153-2
6ES7 153-2AA02-0XB0 V.5
6ES7 153-2AB01-0XB0 V.4
Note
The analog input module SM 331; AI 8RTD24 Bit can only be used with S7
PROFIBUS Masters.
2
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Terminal Connection Diagram
Figure 1 shows the terminal connection diagram and the 4-wire wiring diagram for
the SM331 AI824 Bit RTD Module for the analog.
The detailed technical specifications for this analog input module are on the
following page.
L
1
M0+
3
M0–
CH0
Ic0+
ADC
4
23
24
M4+
M4–
Ic4+
6
26
M1+
7
27
8
28
M5–
29
Ic5+
Ic1+
M2+
Ic2+
Ic2–
9
DAC
30
31
11
ADC
Ic3+
Ic3–
ADC
12
32
Logic
and
back
plane
bus
interface
13
14
15
M3–
DAC
10
M3+
Figure 1
ADC
DC
to
DC
Ic0–
M2–
CH3
L+
22
25
Ic1–
CH2
21
5
M1–
CH1
M
2
33
34
M5+
CH5
Ic5–
M6+
M6–
Ic6+
CH6
Ic6–
35
36
17
37
DAC
Ic4–
M7+
16
18
CH4
DAC
38
19
39
20
40
M7–
Ic7+
CH7
Ic7–
M
Connection Diagram of Analog Input Module SM 331; AI 8RTD24 Bit
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
3
Dimensions and Weight
Dimensions W H D
Weight
40 125 120mm
(1.564.88 4.68
in.)
approx. 272 g
(9.6 oz.)
Data for Specific Module
Number of inputs
max. 200 m
(218 yd.)
24 VDC
Reverse polarity
Yes
max. 5 mA
Isolation
Yes
backplane bus
Yes
power supply of the
electronics
Between the channels
120 VAC
(ECM )
Between MANA and
120 VAC
Minternal (EISO)
Insulation Tested with
500 VAC
max. 100 mA
bus
From the power supply
max. 240 mA
L+
Power dissipation of the
module
4
80
Additional conversion time for 1851
resistance test in milliseconds
open-circuit monitoring in
milliseconds
24 bits
400/60/50
voltage for interference
frequency f1 in Hertz
Smoothing of the measured
values
none/weak/
medium/strong
Conversion time
(per channel)
100 ms
Basic response time of module
(all channels enabled)
200 ms
Module Filtering Mode
8 Ch S/W
Integration time/conversion time/
resolution (per channel)
Parameters can be assigned
Basic conversion time in
Yes
8/25/30
milliseconds
Current source
From the back plane
Yes
Yes
Permitted potential
difference
Between the inputs
8 Ch H/W
Integration time/conversion time/
resolution (per channel)
Resolution including sign
Suppression of interference
protection
Between channels and
Module Filtering Mode
Additional conversion time for 100
Power rated voltage of the
electronics L+
Between channels and
Integrating
milliseconds
Voltage, Currents, Potentials
Constant measured current
for resistance-type sensor
Measuring Principle
Parameters can be assigned
Basic conversion time in
8
Length of cable
Shielded
Analog-to-Digital Converter Performance
Characteristics
typ. 4.6 W
Additional conversion time for 45/79/891
resistance test in milliseconds
Additional conversion time for 20/37/42
open-circuit monitoring in
milliseconds
Resolution including sign
Suppression of interference
24 bits
400/60/50
voltage for interference
frequency f1 in Hertz
Smoothing of the measured
values
none/weak/
medium/strong
Conversion time
(per channel)
20/37/42 ms
Basic response time of module
(all channels enabled)
40/79/84 ms
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Analog-to-Digital Converter Performance
Characteristics (continued)
Measuring Principle
Integrating
Module Filtering Mode
4 Ch H/W
Integration time/conversion time/
resolution (per channel)
Parameters can be assigned
Basic conversion time in
Yes
3.3
milliseconds
Additional conversion time for 1851
resistance test in milliseconds
Additional conversion time for 852
open-circuit monitoring in
milliseconds
Resolution including sign
Suppression of interference
24 bits
400/60/50
voltage for interference
frequency f1 in Hertz
Smoothing of the measured
values
none/weak/
medium/strong
Conversion time
(per channel)
10 ms
Basic response time of module
(all channels enabled)
10 ms
Suppression of interference, Limits of Error
Suppression of
interference for
F=n(fl ± 1%),
(f1=interference
frequency) n=1,2,...
Common-mode
> 100 dB
interference
(Ecm < 120 VAC)
Series mode
RTD Input
± 1.0 ° C
Pt 100, Pt 200,
Pt 500, Pt 1000,
Ni 100, Ni 120,
Ni 200, Ni 500,
Ni 1000, Cu 10
Resistance Input
± 0.1%
150/300/600
Basic error
(operational limit at
25° C, with reference to
the input range)
RTD Input
± 0.5° C
Pt 100, Pt 200,
Pt 500, Pt 1000,
Ni 100, Ni 120,
Ni 200, Ni 500,
Ni 1000, Cu 10
Resistance Input
±0.05%
150/300/600
Temperature error (with
reference to the input
range)
±0.005%/K
Linearity error (with
reference to the input
range)
± 0.02%
Repeatability (in steady
state at 25° C, with
reference to the Input
range)
±0.01%
Status, Interrupts, Diagnostics
> 90 dB
interference (peak
value of the
interference< rated
value of the input
range)
Crosstalk between the
inputs
Operational limit (in the
entire temperature
range, with reference to
the input range)
(0 to 60° C)
Interrupts
Hardware interrupt
when limit has been
exceeded
> 100 dB
Programmable
all channels
Diagnostics interrupt
Programmable
Diagnostics functions
Programmable
Group error display
Diagnostics information
Red LED (SF)
Possible
can be displayed
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
5
Data for Selecting a Sensor
Input range (rated values)
input resistor
Resistance
thermometer
Pt 100, Pt 200,
Pt 500, Pt 1000,
Ni 100, Ni 120,
Ni 200, Ni 500,
Ni 1000, Cu 10
Resistor
150, 300, 600
Maximum input voltage for
voltage input
(destruction limit)
35 VDC continuous
75 VDC for max. 1 s
((pulse
ulse duty factor
1:20)
Connection of the Sensor
With two-conductor
terminal
With three-conductor
three conductor
Yes (without line
resistance
correction)
Yes
terminal
With four-conductor
Yes
terminal
Characteristic linearization
For RTD Resistance
Temperature Detector
Pt100, Pt200, Pt500
Pt1000, Ni100,
Ni120, Ni200, Ni500,
Ni1000, Cu10
(standard and
climatic range)
Note1: Resistance test for 3-wire measurments is performed once every 5 minutes.
Note2: Wirebreak test for 4-ch H/W filtering mode is preformed once every 3 seconds.
6
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Starting Up the Analog Input Module SM 331; AI 8RTD24 Bit
Parameter Assignment
The analog input module SM 331; AI 8RTD24 Bit is set:
With STEP 7 (see the STEP 7 User Manual) or
In the user program by means of SFCs (see the STEP 7 System and Standard
Functions Reference Manual)
Default Setting
The analog input module SM 331; AI 8RTD24 Bit has default settings for
operating mode, measuring type, diagnostics, interrupts, etc., (see Table 1).
These default settings apply, if you have not re-initialized the module with STEP 7.
Table 1
Parameters and Default Settings for the Analog Input Module
SM 331 AI8 x RTD x 24 Bit.
Parameter
SM 331; AI 8RTD24 Bit
Value Range
Default
Settings
Parameter
T
Type
Scope
Enable
Process interrupt when
Yes/No
No
Dynamic
Module
Yes/No
No
32511 to –32512
32767
Dynamic
Channel
–32512 to 32511
–32768
Yes/No
No
Static
Channel
group
Yes/No
No
400 Hz; 60 Hz;
50 Hz
50 Hz
Dynamic
Channel
group
deactivated
RTD–4W
Dynamic
Channel
group
limit value is exceeded
Diagnostics interrupt
Trigger for process interrupt
Upper Limit
Lower Limit
Diagnostics
Group Diagnostics
With wire-break check
Measurement
Interference frequency
suppression
Measurement type
R–4W Resistance
(4-wire connection)
R–3W Resistance
(3-wire connection)
RTD-4W Thermal
resistance (linear,
4-wire-connection)
RTD-3W Thermal
resistance (linear,
3-wire-connection)
Measuring Range
For the settable
measuring ranges
of the input
channels, please
refer to Table 17
and Table 18.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
PT100Ω Cl
.003850
7
Channel Groups
The channels of the analog input module SM 331; AI 8RTD 24Bit are arranged
in groups of two. You must assign the same parameters to both channels in each
group, with the exception of alarm limits.
Table 2 shows which channels of the analog input module
SM 331; AI 8RTD24 Bit are configured as one channel group. You need the
channel group numbers to set the parameters in the user program with an SFC.
See Figure A-3 in Appendix A of the S7-300 Installation and Hardware Manual for
more information.
Table 2
Assignment of Channels of the Analog Input Module
SM 331; AI 8RTD24 Bit to Channel Groups
Channels ...
...Form One Channel Group Each
Channel 0
Channel group 0
Channel 1
Channel 2
Channel group 1
Channel 3
Channel 4
Channel group 2
Channel 5
Channel 6
Channel group 3
Channel 7
Operating Modes
The analog input module SM 331; AI 8RTD24 Bit operates in the following
modes:
8 Channel Hardware Filtering
8 Channel Software Filtering
4 Channel Hardware Filtering
Channel Isolation
If you configure the analog input module SM 331; AI 8RTD24 Bit for four
channels, with one channel connected in each group, the maximum isolation is 500
VAC. If you configure more than four channels, the common mode withstand
voltage between two channels in a group is 120 VAC.
8
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
8 Channel Hardware Filtering Mode
Module Cycle Description
When operating in the 8 Channel Hardware Filtering Mode the analog input module
SM331; AI 8RTD24 Bit switches between the two channels in each group.
Since the module contains four analog-to-digital converters (ADC), all four ADCs
convert simultaneously for channels 0, 2, 4 and 6. Upon completion of the even
numbered channels, all four ADCs convert simultaneously for channels 1, 3, 5 and
7 the odd numbered channels (see Figure 2).
Start Analog Conversion
(Simultaneously)
Ch0
CH2
CH4
CH6
Cycle
Time
Start Analog Conversion
(Simultaneously)
Ch1
Figure 2
CH3
CH5
CH7
8 Channel Hardware Filtering Mode Cycle
Module Cycle Time
When operating in the 8 Channel Hardware Filtering Mode the analog input module
SM331; AI 8RTD24 Bit channel conversion time, including communication
overhead, is 85 ms. The module must then switch to the opposite channel in the
group using the opto-mos relays. The opto-mos relays require 12ms to switch and
settle fully. Each channel requires 97 ms of time making the module cycle time
equal to 194 ms.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
9
8 Channel Software Filtering Mode
Module Cycle Description
When you operate in the 8 Channel Software Filtering Mode the analog input
module SM331; AI 8RTD24 Bit switches between the two channels in each
group. Since the module contains four analog-to-digital converters (ADC), all four
ADCs convert simultaneously for channels 0, 2, 4 and 6. After the even numbered
channels convert , all four ADCs convert simultaneously for channels 1, 3, 5 and 7.
Start Analog Conversion
(Simultaneously)
Ch0
CH2
CH4
CH6
Cycle
Time
Start Analog Conversion
(Simultaneously)
Ch1
Figure 3
10
CH3
CH5
CH7
8 Channel Software Filtering Mode Cycle
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Module Cycle Time
When operating in the 8 Channel Software Filtering Mode the analog input module
SM331; AI 8RTD24 Bit, the channel conversion time is dependent of the
interference frequency selected. If you select an interference frequency of 50 Hz,
the channel conversion time, including communication overhead, is 30 ms. If you
select an interference frequency of 60 Hz, the channel conversion time is 25 ms. If
you select an interference frequency of 400 Hz, the channel conversion time
reduces to 8 ms. Similar to the 8 Channel Hardware Filtering Mode, the module
must then switch to the opposite channel in the group using the opto-mos relays
with a settling time of 12 ms. Table 3 shows the module cycle time for a specific
interference frequency .
Table 3
8 Channel Software Filteing Mode Cycle Times
Interference Frequency
(Hz)
Channel Cycle
Time (ms)
Module Cycle Time
(for all Channels)
50
42
84
60
37
74
400
20
40
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
11
4 Channel Hardware Filtering Mode
Module Cycle Description
When you operate in the 4 Channel Hardware Filtering Mode, the analog input
module SM331; AI 8RTD24 Bit does not switch between the channels in each
group. Since the module contains four analog-to-digital converters (ADC), all four
ADCs convert simultaneously for channels 0, 2, 4 and 6.
Start Analog Conversion
(Simultaneously)
Ch0
Figure 4
CH2
CH4
CH6
Cycle
Time
4 Channel Hardware Filtering Mode Cycle
Module Cycle Time
When operating in the 4 Channel Hardware Filtering Mode, the analog input
module SM331; AI 8RTD24 Bit channel conversion time, including
communication overhead is 10 ms. Since the module does not switch between the
channels within the groups, the channel cycle time and the module cycle time are
the same, 10ms.
12
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Measuring Methods and Measuring Ranges of the Analog Input Module
SM 331; AI 8RTD24 Bit
Measuring Methods
You can set the following measuring methods on the analog input module
SM 331; AI 8RTD 24 Bit:
RTD 4-wire measurement
RTD 3-wire measurement
Resistance 4-wire measurement
Resistance 3-wire measurement
Use the STEP 7 tool on the analog input module to make the necessary settings.
See Section 4.3.4 of the S7-300 Installation and Hardware Manual for more
information about these settings.
Measuring Ranges
Table 6 through table 12 lists the measuring ranges you can use with the analog
input module. Use STEP 7 to select the desired measuring ranges.
Common Mode Voltage
The analog input module SM 331; AI 8RTD24 Bit can make measurements in
the presence of AC or DC common mode voltage.
The AC and DC common mode voltage rejection is accomplished by the use of an
instrumentation amplifier for the input stage. The relative measurement performed
by the instrumentation amplifier rejects voltages < 120V RMS and < 120 VDC with
a rejection ratio of > 100dB.
Wire-Break Check
The wire-break check is a module software function that is provided for all module
modes. The process for detecting a wire-break is to reduce by half the excitation
current for the given sensor and to verify that the resulting value is within nominal
limits of the prior value measured. Since the wire-break value is not reported to the
CPU, the module cycle time is doubled for the 8 Channel hardware and software
filtering mode, regardless of the number of channels with wire-break enabled.
When operating in the 4 channel hardware filtering mode, the reduction in
excitation current is performed once every three seconds, or once every 30 input
channel scans. However, there is a break in the input data when performing
wire-break detection. Since the reduction in excitation current basically is a step
function to the module input, the ADCs digital filter requires 85ms to settle and
report valid data. With a return to full excitation current, the total break in the input
data is 170 ms.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
13
Measuring Ranges for RTD and Resistance Measurements
Table 4 shows all of the RTD and resistance measuring ranges for the
SM331; AI 8RTD24 Bit module.
Table 4
Measuring Ranges for RTD and Resistance Measurements
Measuring
Method
Selected
RTD4-Wire/3-Wire
Description
Table 7 through Table 12 shows the
digitized analog values in the RTD
measuring range.
Measuring Range
ClimaticPt 100, Pt 200, Pt 500,
Pt 1000, Ni 100,
Ni 120, Ni 200, Ni 500,
Ni 1000, Cu 10
StandardPt 100, Pt 200, Pt 500,
Pt 1000, Ni 100,
Ni 120, Ni 200, Ni 500,
Ni 1000, Cu 10
Resistance4-Wire/3-Wire
Table 6 shows the digitized analog
values in the resistance measuring
range.
150
300
600
Short to M or L
If you short an input channel to M or L, no damage will occur to the module.
The channel continues to report valid data and no diagnostics are reported.
Overflow, Underflow, and Process Interrupt Limits
Overflow and Underflow diagnostic thresholds for some of the measuring ranges
differ from those shown in Section 4.1.2, of the S7-300 Installation and Hardware
Manual. Numerical methods in the module software for evaluating the process
variables prevent values up to 32511 from being reported in some cases.
Process interrupt limits should not be set at values higher than the minimum
potential overflow or underflow threshold limits shown in Table 6 through Table 12.
14
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
End–of Cycle Interrupt
Enabling the end-of-cycle interrupt allows you to synchronize a process with the
module conversion cycle. The interrupt occurs when the conversion of all enabled
channels is complete.
Table 5
Contents of the 4 Bytes Supplementary Information of OB40 During a Process
Interrupt or an End-of-Cycle Interrupt
Contents of the 4 Bytes
Supplementary Information
27
26
25
Analog 2 bits per channel for marking the range
SM
SMs
Upper limit value
7
6
5
exceeded in channel
Lower limit value
exceeded in channel
7
6
5
24
23
22
21
20
Byte
4
3
2
1
0
0
4
3
2
1
0
1
X
End-of-Cycle event
2
3
Unused Bit
Wiring Diagrams
Figure 5 shows the wiring diagrams for 4-wire and 3-wire sensor elements. When
you use a 3-wire sensor, ensure you insert the jumper between M+ and Ic+.
Incorrect wiring results in unpredictable module behavior.
M+
Jumper M+ to Ic+
M–
M–
Ic+
Ic+
Ic–
Ic–
4-Wire Wiring
Figure 5
M+
3-Wire Wiring
4-Wire and 3-Wire Wiring Diagram
Unused Input Channels
In order to reduce unnecessary wiring, use STEP 7 to deactivate unused channel
groups of the SM331; AI 8RTD24 Bit module (see Table 1).
You must terminate an unused channel within an activated group to eliminate
diagnostic errors for the unused input. Figure 5 shows how to attach a nominal
resistor for the selected input range to terminate the unused input.
When you operate in the 4 Channel Hardware Module Mode, no channel
termination is required if you deactivate the unused input channel groups.
Channels 1, 3, 5 and 7 are not monitored during this module mode of operation.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
15
Analog Value Representation of the Measuring Ranges of the Analog
Input Module SM 331: AI 8RTD24 Bit
Introduction
The tables in this section contain the digitized analog values for the various
measuring ranges of the analog input module. See table 6 through table 12.
How to Read the Measured-Value Tables
Since the binary representation for the analog values is always the same, these
tables only contain the measured values and the units.
Resistance-Type Sensors Measuring Ranges
Table 6 shows the representation of the digitized measured value for
resistance-type sensors with the measuring ranges 150 Ω, 300 Ω, and 600 Ω.
Table 6
Representation of the Digitized Measured Value of an Analog Input Module
(Resistance-Type Sensors)
Measuring
Range
150
Measuring
Range
300
Measuring
Range
600
Decimal
Hexadecimal
>176.383
>352.767
>705.534
32767
7FFF
Overflow
176.383
.
.
150.005
352.767
.
.
300.011
705.534
.
.
600.022
32511
.
.
27649
7EFF
.
.
6C01
Overrange
150.000
112.500
.
.
0.000
300.000
225.000
.
.
0.000
600.000
450.000
.
.
0.000
27648
20736
.
.
0
6C00
5100
.
.
0
Nominal
Range
–1
.
.
FFFF
.
.
Under
Underrange
32767
8000
Underflow
(negative values physically not possible)
–
16
–
–
System Word Units
Range
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Standard Temperature Ranges
Table 7 shows the representation of the digitized measured value for the standard
temperature range of the Pt 100, Pt 200, Pt 500 and Pt 1000 sensors.
Table 7
Standard Temperature Range for Pt 100, Pt 200, Pt 500, Pt 1000
System Word Units
Range
Decimal
Standard Temperature Range
Pt 100,
100 Pt 200
200, Pt 500
500, Pt 1000
Hexadecimal
850 °C
Overflow
32767
7FFF
>1000.0
Overrange
10000
.
.
8501
2710
.
.
2135
1000.0
.
.
850.1
Nominal range
8500
.
.
–2000
2134
.
.
F830
850.0
.
.
–200.0
Underrange
–2001
.
.
–2430
F82F
.
.
F682
–200.1
.
.
–243.0
Underflow
–32768
8000
<–243.0
Climate Temperature Ranges
Table 8 shows the representation of the digitized measured value for the climate
temperature range of the Pt 100, Pt 200, Pt 500 and Pt 1000 sensors.
Table 8
Climate Temperature Range for Pt 100, Pt 200, Pt 500, Pt 1000
System Word Units
Range
Decimal
Climate Temperature Range
Pt 100,
100 Pt 200
200, Pt 500
500, Pt 1000
Hexadecimal
130 °C
Overflow
32767
7FFF
>155.00
Overrange
15500
.
.
13001
3C8C
.
.
32C9
155.00
.
.
130.01
Nominal range
13000
.
.
–12000
32C8
.
.
D120
130.00
.
.
–120.00
Underrange
–12001
.
.
–14500
D120
.
.
C75C
–120.01
.
.
–145.00
Underflow
–32768
8000
<–145.00
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
17
Standard Temperature Ranges
Table 9 shows the representation of the digitized measured value for the standard
temperature range of the Ni 100, Ni 120, Ni 200, Ni 500 and Ni 1000 sensors.
Table 9
Standard Temperature Range for Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000
System Word Units
Range
Decimal
Standard Temperature Range
Ni 100,
100 Ni 120,
120
Hexadecimal Ni 200, Ni 500, Ni 1000 250 °C
Overflow
32767
7FFF
>295.0
Overrange
2950
.
.
2501
0B86
.
.
09C5
295.0
.
.
250.1
Nominal range
2500
.
.
–600
09C4
.
.
FDA8
250.0
.
.
–60.0
Underrange
–601
.
.
–1050
FDA7
.
.
FBE6
–60.1
.
.
–105.0
Underflow
–32768
8000
<–105.0
Climate Temperature Ranges
Table 9 shows the representation of the digitized measured value for the standard
temperature range of the Ni 100, Ni 120, Ni 200, Ni 500 and Ni 1000 sensors.
Table 10
Climate Temperature Range for Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000
System Word Units
Decimal
Hexadecimal
Climate Temperature Range
Ni 100,
100 Ni 120,
120
Ni 200, Ni 500, Ni 1000 250 °C
Overflow
32767
7FFF
>295.00
Overrange
29500
.
.
25001
733C
.
.
61A9
295.00
.
.
250.01
Nominal range
25000
.
.
–6000
61A8
.
.
E890
250.00
.
.
–60.00
Underrange
–6001
.
.
–10500
E88F
.
.
D6FC
–60.01
.
.
–105.00
Underflow
–32768
8000
<–105.00
Range
18
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Standard Temperature Ranges
Table 11 shows the representation of the digitized measured value for the standard
temperature range of the Cu 10 sensors.
Table 11
Standard Temperature Range for Cu 10
System Word Units
Range
Decimal
Standard Temperature Range
C 10
Cu
Hexadecimal
260 °C
Overflow
32767
7FFF
>312.0
Overrange
3120
.
.
2601
0C30
.
.
0A29
312.0
.
.
260.1
Nominal range
2600
.
.
–2000
0A28
.
.
F830
260.0
.
.
–200.0
Underrange
–2001
.
.
–2400
F82F
.
.
F6A0
–200.1
.
.
–240.0
Underflow
–32768
8000
<–240.0
Climate Temperature Ranges
Table 12 shows the representation of the digitized measured value for the climate
temperature range of the Cu 10 sensors.
Table 12
Climate Temperature Range for Cu 10
System Word Units
Decimal
Hexadecimal
Climate Temperature Range
C 10
Cu
150 °C
Overflow
32767
7FFF
>180.00
Overrange
18000
.
.
15001
4650
.
.
3A99
180.00
.
.
150.01
Nominal range
15000
.
.
–5000
3A98
.
.
EC78
150.00
.
.
–50.00
Underrange
–5001
.
.
–6000
EC77
.
.
E890
–50.01
.
.
–60.00
Underflow
–32768
8000
<–60.00
Range
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
19
Parameter Sets for Analog Input Module SM 331; AI 8RTD24 Bit
Parameter Assignment in the User Program
You have already set the parameters for the S7-300 module using STEP 7. You
can use an SFC in the user program to change the AI 8RTD24 bit module
dynamic parameters. You can also use an SFC in the user program to transfer the
parameters from the CPU to the addressed module.
Parameters Stored in Data Records
The parameters for the AI 8RTD24 bit module are stored in three data
records: records 0, 1 and 128.
Modifiable Parameters
You can change the parameters of record 1 and/or record 128 and pass them to
the AI 8RTD24 bit module using SFC 55. This does not change the
parameters set on the CPU. You cannot change the S7-300 parameters of record
0 in the user program.
The following section shows an overview of the parameters that are stored in
records 0, 1, and 128 for the AI 8RTD24 bit module.
SFCs for Parameter Assignment
The following SFCs are available for assigning the parameters for the
AI 8RTD24 bit module in the user program.
Table 13
SFCs for Assigning Module Parameters
SFC No.
Identifier
Application
55
WR_PARM
56
WR_DPARM
Transfer parameters (records 0, 1 or 128) from the
CPU to the addressed signal module.
57
PARM_MOD
Transfer all parameters (records 0, 1, and 128) from
the CPU to the addressed signal module.
Transfer modifiable parameters (record 1 and 128) to
the addressed signal module.
Description of the Parameters
The following section contains all the modifiable parameters for the
AI 8RTD24 bit module.
The parameters for the AI 8RTD24 bit module are described in this Product
Information document and in the online help of STEP 7.
20
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Parameters of Analog Input Module SM 331; AI 8RTD24 Bit
Parameters
Table 14 contains all the parameters that you can set for the Analog Input Module
SM 331; AI 8RTD24 bit. The comparison shows:
Parameters you can change using STEP 7.
Parameters you can change using SFC 55 “WR_PARM”.
The parameters you set using STEP 7 can also be transferred to the module using
SFCs 56 and 57.
Table 14
Parameters for the Analog Input Module SM 331; AI 8RTD24 bit
Configurable with...
Data Record
No.
...SFC S5
...Programming Device
Diagnostics: Group
0
No
Yes
Diagnostics: with wire-break
0
No
Yes
Limit value interrupt enable
1
Yes
Yes
Diagnostic interrupt enable
1
Yes
Yes
End of cycle interrupt enable
1
Yes
Yes
Measurement units
1
Yes
Yes
Module Mode
128
Yes
Yes
Interference frequency suppression
128
Yes
Yes
Measurement type
128
Yes
Yes
Measurement range
128
Yes
Yes
Measurement range alpha
128
Yes
Yes
Measurement smoothing
128
Yes
Yes
Upper limit value
128
Yes
Yes
Lower limit value
128
Yes
Yes
Parameter
Note: Before you can enable the diagnostic interru
interruptt in record 1 in the user program,
rogram, you must first
enable the diagnostics in record 0 with STEP 7.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
21
Structure of Data Record 1
Figure 6 shows the structure of data record 1 for the parameters of the Analog
Input Module SM 331; AI 8RTD24 bit.
You can activate a parameter by setting the corresponding bit in byte 0 to “1”.
7
6
5
4
3
2
1
0
Bit number
Byte 0
Celsius / Fahrenheit
Cycle end interrupt enable
Diagnostics enable
Limit value interrupt enable
Figure 6
22
Byte 1
Unused
Byte 2
Unused
Byte 3
Unused
Byte 4
Unused
Byte 5
Unused
Byte 6
Unused
Byte 7
Unused
Byte 8
Unused
Byte 9
Unused
Byte 10
Unused
Byte 11
Unused
Byte 12
Unused
Byte 13
Unused
Data Record 1 for Parameters of the Analog Input Module
SM 331; AI 8RTD24 bit
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Structure of Data Record 128
Figure 7 shows the structure of data record 128 for the parameters of the Analog
Input Module SM 331; AI 8RTD24 bit.
7
Byte 0
Byte 1
6
5
4
3
2
1
0
Bit number
Module Mode (See Table 15)
Interference frequency
suppression
Channel group 0
Channel group 1
Channel group 2
Channel group 3
(See Table 16)
Byte 2
Measurement Type, Group 0
(see Table 17)
Byte 3
Measurement Range, Group 0
(see Table 17)
Byte 4
Alpha Selection, Group 0
(see Table 18)
Smoothing, Group 0
(see Table 19)
Byte 5
Measurement Type, Group 1
(see Table 17)
Byte 6
Measurement Range, Group 1
(see Table 17)
Byte 7
Alpha Selection, Group 1
(see Table 18)
Smoothing, Group 1
(see Table 19)
Figure 7
Data Record 128 for Parameters of the Analog Input Module
SM 331; AI 8RTD24 bit
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
23
Byte 8
Measurement Type, Group 2
(see Table 17)
Byte 9
Measurement Range, Group 2
(see Table 17)
Byte 10
Alpha Selection, Group 2
(see Table 18)
Smoothing, Group 2
(see Table 19)
Byte 11
Measurement Type, Group 3
(see Table 17)
Byte 12
Measurement Range, Group 3
(see Table 17)
Byte 13
Alpha Selection, Group 3
(see Table 18)
Smoothing, Group 3
(see Table 19)
Figure 6
24
Byte 14
High Byte
Byte 15
Low Byte
Byte 16
High Byte
Byte 17
Low Byte
Byte 18
High Byte
Byte 19
Low Byte
Byte 20
High Byte
Byte 21
Low Byte
Data Record 128 for Parameters
SM 331; AI 8RTD24 bit (continued)
of
the
Upper limit value
Group 0;
Channel 0
Lower limit value
Group 0;
Channel 0
Upper limit value
Group 0;
Channel 1
Lower limit value
Group 0;
Channel 1
Analog
Input
Module
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Figure 6
Byte 22
High Byte
Byte 23
Low Byte
Byte 24
High Byte
Byte 25
Low Byte
Byte 26
High Byte
Byte 27
Low Byte
Byte 28
High Byte
Byte 29
Low Byte
Byte 30
High Byte
Byte 31
Low Byte
Byte 32
High Byte
Byte 33
Low Byte
Byte 34
High Byte
Byte 35
Low Byte
Byte 36
High Byte
Byte 37
Low Byte
Byte 38
High Byte
Byte 39
Low Byte
Byte 40
High Byte
Byte 41
Low Byte
Byte 42
High Byte
Byte 43
Low Byte
Byte 44
High Byte
Byte 45
Low Byte
Data Record 128 for Parameters
SM 331; AI 8RTD24 bit (continued)
of
the
Upper limit value
Group 1;
Channel 2
Lower limit value
Group 1;
Channel 2
Upper limit value
Group 1;
Channel 3
Lower limit value
Group 1;
Channel 3
Upper limit value
Group 2;
Channel 4
Lower limit value
Group 2;
Channel 4
Upper limit value
Group 2;
Channel 5
Lower limit value
Group 2;
Channel 5
Upper limit value
Group 3;
Channel 6
Lower limit value
Group 3;
Channel 6
Upper limit value
Group 3;
Channel 7
Lower limit value
Group 3;
Channel 7
Analog
Input
Module
The representation of the limit values matches the analog value representation.
Observe the range limits when setting the limit values.
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
25
Module Mode
Table 15 contains the codes for the various module operating modes that you enter
in byte 0 of data record 128 (see Figure 7).
Table 15
Codes for the module modes of the Analog Input Module
SM 331; AI 8RTD24 bit
Module Mode
Code
8 Channel Hardware Filtering
2#00000000
8 Channel Software Filtering
2#00000001
4 Channel Hardware Filtering
2#00000010
Interference Frequency Suppression
Table 16 contains the codes for the various frequencies that you enter in record
128 (see Figure 7). Note that the 50 Hz, 60 Hz, and 400 Hz selections are for the 8
Channel Software Filtering module mode only. The 50/60/400 Hz selection is for
the 8 Channel and 4 Channel Hardware Filtering module modes only.
Table 16
26
Codes for the Interference Frequency Suppression of Analog Input Module
SM 331; AI 8RTD24 bit
Interference Frequency Suppression
Code
400 Hz
2#00
60 Hz
2#01
50 Hz
2#10
50/60/400 Hz
2#11
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Measurement Type and Measurement Range
Table 17 contains all the measuring ranges for the Analog Input Module SM 331;
AI 8RTD24 bit. Table x also shows the codes for the measurement types and
the measuring range. You must enter these codes, according to the measuring
range desired, in the appropriate bytes of data record 128 (see Figure 7).
Table 17
Codes fortheMeasuring Ranges ofthe Analog InputModule SM331: AI 8RTD24 Bit
Measurement Type
Code
Measurement Range
Code
Deactivated
2#0000
Deactivated
2#0000
Resistor 4-Wire Connection
2#0100
150 Ω
300 Ω
600 Ω
2#0010
2#0100
2#0110
Resistor 3-Wire Connection
2#0101
150 Ω
300 Ω
600 Ω
2#0010
2#0100
2#0110
Resistance-Type Thermometer + linearization 4-Wire
Connection
2#1000
Pt 100 Climate Range
Ni 100 Climate Range
Pt 100 Standard Range
Ni 100 Standard Range
Pt 500 Standard Range
Pt 1000 Standard Range
Ni 1000 Standard Range
Pt 200 Climate Range
Pt 500 Climate Range
Pt 1000 Climate Range
Ni 1000 Climate Range
Pt 200 Standard Range
Ni 120 Standard Range
Ni 120 Climate Range
Cu 10 Climate Range
Cu 10 Standard Range
Ni 200 Standard Range
Ni 200 Climate Range
Ni 500 Standard Range
Ni 500 Climate Range
2#00000000
2#00000001
2#00000010
2#00000011
2#00000100
2#00000101
2#00000110
2#00000111
2#00001000
2#00001001
2#00001010
2#00001011
2#00001100
2#00001101
2#00001110
2#00001111
2#00010000
2#00010001
2#00010010
2#00010011
Resistance-Type Thermometer + linearization 3-Wire
Connection
2#1001
Pt 100 Climate Range
Ni 100 Climate Range
Pt 100 Standard Range
Ni 100 Standard Range
Pt 500 Standard Range
Pt 1000 Standard Range
Ni 1000 Standard Range
Pt 200 Climate Range
Pt 500 Climate Range
Pt 1000 Climate Range
Ni 1000 Climate Range
Pt 200 Standard Range
Ni 120 Standard Range
Ni 120 Climate Range
Cu 10 Climate Range
Cu 10 Standard Range
Ni 200 Standard Range
Ni 200 Climate Range
Ni 500 Standard Range
Ni 500 Climate Range
2#00000000
2#00000001
2#00000010
2#00000011
2#00000100
2#00000101
2#00000110
2#00000111
2#00001000
2#00001001
2#00001010
2#00001011
2#00001100
2#00001101
2#00001110
2#00001111
2#00010000
2#00010001
2#00010010
2#00010011
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
27
Resistance-type Thermometer Alpha Selection
Table 18 contains all the alpha selections for the resistance-type thermometer
measuring range of the Analog Input Module SM 331; AI 8RTD24 bit. You
must enter these codes, according to the measuring range desired, in the appropriate bytes of data record 128 (see Figure 7).
Table 18
Codes for the Alpha Selection of the Analog Input Module
SM 331; AI8 RTD24 Bit
Alpha Selection
Code
Pt 0.003850 Ω/Ω/°C
2#0000
Pt 0.003916 Ω/Ω/°C
2#0001
Pt 0.003902 Ω/Ω/°C
2#0010
Pt 0.003920 Ω/Ω/°C
2#0011
Pt 0.00385055 Ω/Ω/°C
2#0100
Ni 0.006180 Ω/Ω/°C
2#1000
Ni 0.006720 Ω/Ω/°C
2#1001
Cu 0.00427 Ω/Ω/°C
2#1100
Input Smoothing Selection
Table 19 contains all the smoothing selections for the Analog Input Module SM
331; AI 8RTD24 bit. You must enter these codes, according to the measuring
range desired, in the appropriate bytes of data record 128 (see Figure 7).
Table 19
28
Codes for the Smoothing Selection of the Analog Input Module
SM 331; AI 8 RTD24 Bit
Smoothing Selection
Code
None
2#00
Weak
2#01
Medium
2#10
Strong
2#11
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
Product Information S7–300 Analog Input Module SM 331; AI 8 x RTD x 24 Bit
2807946–0002
29
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