Siemens Simatic SM331 User manual

Preface
Requirements
Task
Mechanical setup of the sample
station
Electrical connection
Configuration with
SIMATIC Manager
Test the user program
Diagnostic interrupt
Hardware interrupt
Source Code of the user Program
SIMATIC
SM331; AI 8 x 12 Bit
Getting Started
Part 1: 4-20mA
Edition 09 / 2003
A5E00253410

Copyright © Siemens AG 2003 All rights reserved
The reproduction, transmission or use of this document or its
contents is not permitted without express written authority.
Offenders will be liable for damages. All rights, including
rights created by patent grant or registration of a utility model
or design, are reserved.
Siemens AG
Bereich Automation and Drives
Geschäftsgebiet Industrial Automation Systems
Postfach 4848, D- 90327 Nürnberg
Disclaimer of Liability
We have checked the contents of this manual for agreement with
the hardware and software described. Since deviations cannot be
precluded entirely, we cannot guarantee full agreement. However,
the data in this manual are reviewed regularly and any necessary
corrections included in subsequent editions. Suggestions for
improvement are welcomed.
© Siemens AG 2003
Technical data subject to change.
Siemens Aktiengesellschaft
A5E00253410
Safety-related Guidelines
This manual contains notices intended to ensure personal safety, as well as to protect
the products and connected equipment against damage. These notices are highlighted
by the symbols shown below and graded according to severity by the following texts:
!Danger
indicates that death, severe personal injury or substantial property damage will result
if proper precautions are not taken.
!Warning
indicates that death, severe personal injury, or substantial property damage can result
if proper precautions are not taken.
!Caution
indicates that minor personal injury or property damage can result if proper precautions
are not taken.
Note
contains important information about the product, its operation or a part of the document
to which special attention is drawn.
Qualified personnel
A device/system may only be commissioned or operated by qualified personnel.
Qualified personnel as referred to in the safety guidelines in this document are persons
authorized to energize, de-energize, clear, ground, and tag circuits, equipment and
systems in accordance with established safety practice.
Correct Usage
Please observe the following:
!Warning
The equipment/system or the system components may only be used for the applications
described in the catalog or the technical description, and only in combination with
the equipment, components, and devices of other manufacturers as far as this is recommended
or permitted by Siemens.
The product will function correctly and safely only if it is transported, stored, set up,
and installed as intended, and operated and maintained with care.
Registered Trademarks
SIMATIC®, SIMATIC HMI® and SIMATIC NET® are registered trademarks of Siemens AG.
Third parties using for their own purposes any other names in this document which refer to trademarks
might infringe upon the rights of the trademark owners.

Getting Started SM331 AI 8x12bit Part 1 :4-20m
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Contents:
1Preface ........................................................................................................ 3
2Requirements ............................................................................................. 4
2.1 Required basic knowledge ........................................................................... 4
2.2 Required Hardware and Software................................................................ 4
3Task ............................................................................................................. 6
4Mechanical setup of the sample station .................................................. 8
4.1 Mounting the sample station ........................................................................ 8
4.2 Mounting the analog module...................................................................... 10
4.2.1 Components of the SM331 ........................................................................ 10
4.2.2 Properties of the analog module ................................................................ 11
4.2.3 Measuring range modules.......................................................................... 12
4.2.4 Mounting the SM331 module ..................................................................... 14
5Electrical connection ............................................................................... 15
5.1 Wiring the power supply and the CPU ....................................................... 15
5.2 Wiring the analog module .......................................................................... 17
5.2.1 Current transducer wiring - Principle.......................................................... 17
5.2.2 Wiring of the analog module ...................................................................... 18
5.2.3 Switch on now ............................................................................................ 20
6Configuration with SIMATIC Manager.................................................... 21
6.1 Create a new STEP7 Project ..................................................................... 21
6.1.1 CPU Selection............................................................................................ 23
6.1.2 Define the basic user program ................................................................... 23
6.1.3 Specify the project name............................................................................ 24
6.1.4 Resulting S7 project is created .................................................................. 24
6.2 Hardware configuration .............................................................................. 25
6.2.1 Create the hardware configuration............................................................. 25
6.2.2 Insert SIMATIC components ...................................................................... 26
6.2.3 Parameterization of the analog module ..................................................... 28
6.2.4 Power up test ............................................................................................. 31
6.3 STEP7 user program ................................................................................. 34
6.3.1 Function of the user program ..................................................................... 34
6.3.2 Create user program .................................................................................. 35
7Test the user program ............................................................................. 40
7.1 Download system data and user program ................................................. 40
7.2 Visualization of the sensor signals ............................................................. 42
7.3 Display of analog values ............................................................................ 45
8Diagnostic interrupt ................................................................................. 46
8.1 Read diagnostic data from a PG ................................................................ 46
8.2 General hardware interrupt ........................................................................ 47
8.3 Channel dependent diagnostic interrupts................................................... 48
8.3.1 Configuration / parameterization errors...................................................... 48
8.3.2 Common mode errors ................................................................................ 48

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8.3.3 Wire break.................................................................................................. 49
8.3.4 Underflow ................................................................................................... 49
8.3.5 Overflow ..................................................................................................... 49
9Hardware interrupt ................................................................................... 51
10 Source code of the user program........................................................... 53

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1 Preface
Purpose of the Getting Started
The Getting Started gives you a complete overview of the commissioning of
the analog module SM331. It assists you in the installation and parameteri-
zation of the hardware of a 4-20mA sensor and the configuration with
SIMATIC S7 Manager.
The target audience of the Getting Started is a beginner with only basic ex-
perience in configuration, commissioning and servicing of automation sys-
tems.
What to expect
Step by step the procedures from mounting the module to storing analog
values in the STEP7 user program are explained in detail by means of an
example. In the following sections you will be introduced to:
• Problem analysis
• Mechanical setup of the sample station
• Electrical connection of the sample station
• Configure hardware with SIMATIC Manager using HW Config
• Creating a small user program with STEP7 which stores the read analog
values in a data block
• Triggering and interpreting diagnostic and hardware interrupts

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2 Requirements
2.1 Required basic knowledge
No special knowledge in the area of automation technique is required to
understand this description. As the configuration of the analog module is
done with the software STEP7, proficiency in STEP7 would be advanta-
geous.
Further information on STEP7 can be found in the electronic manuals that
were delivered with STEP7.
Knowledge of PC or similar computer devices (e.g. programming devices)
using the operating system Windows 95/98/2000/NT or XP is assumed.
2.2 Required Hardware and Software
The scope of delivery of the analog module consists of two parts:
The module itself and a front connector, which enables it to comfortably
connect the power supply and the data connections.
Table 2-1 Components of the analog module
Quantity Article Order number
1 SM 331, Electrically ISOLATED 8 AI, ALARM DIAGNOSTICS 6ES7331-7KF02-0AB0
1 20-pin FRONT CONNECTOR with spring contacts 6ES7392-1BJ00-0AA0
The general SIMATIC components required for the example are as follows:
Table 2-2 SIMATIC components of the sample station
Quantity Article Order number
1 PS 307 Power Supply AC 120/230V, DC 24V, 5A 6ES7307-1EA00-0AA0
1 CPU 315-2DP 6ES7315-2AG10-0AB0
1 MICRO MEMORY CARD, NFLASH, 4 MBYTE 6ES7953-8LM00-0AA0
1 SIMATIC S7-300, RAIL L=530MM 6ES7390-1AF30-0AA0
1 Programming device (PD) with MPI-interface and MPI cable
PC with corresponding interface card
Depending on the
configuration
Table 2-3 Software STEP7
Quantity Article Order number
1 STEP7 Software version 5.2 or later, installed on the pro-
gramming device.
6ES7810-4CC06-0YX0

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The following current transducers can be used for the acquisition of analog
signals:
Table 2-4 Current transducers
Quantity Article Order number
1 2-Wire current transducer Depending on the
manufacturer
1 4-Wire current transducer Depending on the
producer
Note
This „Getting Started“ describes only the application of 4 – 20 mA current trans-
ducers in the 2-Wire or 4-Wire model. If you want to use other transducers, then
you have to wire and parameterize the SM331 differently.
Furthermore, the following tools and materials are necessary:
Table 2-5 General tools and materials
Quan-
tity
Article Order number
Multiple M6-bolts and nuts (Length depending on the
mounting place)
standard
1 Screwdriver with blade width 3,5 mm standard
1 Screwdriver with blade width 4,5 mm standard
1 Wire cutting pliers and tools for stripping standard
1 Tools to mount the cable end sleeve standard
X m Wire for grounding the rail, 10 mm2diameter.
Ring terminal with 6,5 mm hole, length according to
local conditions.
standard
X m Flexible wire with 1mm2diameter with fitting wire
end sleeves, Form A in 3 different colors – blue,
red and green
standard
X m 3-wire power cord (AC 230/120V) with protective
contact socket, length according to local conditions.
standard
1 Calibration device (Measuring instrument for com-
missioning, that can measure and supply current)
Depending on the
manufacturer

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3 Task
You want to connect three analog inputs to your station. One of them
should have a 2-wire current transducer and the other two share a 4-wire
current transducer.
You need failure diagnostic capabilities and want two sensors to be able to
trigger hardware interrupts.
You have the analog input module SM331, AI8x12 Bit (order number 6ES7
331-7KF02-0AB0) available. The module is diagnostic and hardware inter-
rupt capable and can process up to 8 analog inputs. Different measuring
modes can be configured for each module (e.g. 4- 20 mA; PT 100; Ther-
mocouple).
24V DC
5,71
PS 307 CPU
2-wire current
transducer
Sensor 1
Programming device
M
PI cable
230V AC 50 Hz
or
120V AC 60 Hz
Calibration device
SM 331
Sensor 2
Sensor 3
Sample station
4-wire current
transducer
Figure 3-1 Sample station components

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You will be guided through these steps
• Mechanical setup of the sample station (see chapter 4)
! General mounting instructions for S7-300 modules
! Configuration of the SM331 for the two selected measure-
ment transducer types
• Electrical wiring of the sample station (see chapter 5)
! Wiring of the power supply and the CPU
! Wiring of the analog module
! Standard pin layout of two measurement transducer types
! Wiring of unused inputs
• Configuration with SIMATIC Manager (see chapter 6)
! Use of project wizard
! Completing the automatically generated hardware configura-
tion
! Integration of the supplied user program source
• User program testing (see chapter 7)
! Interpreting the read values
! Converting the measured values into readable analog values
• Utilizing the diagnostic capabilities of the SM331 module (see chapter 8)
! Triggering a diagnostic interrupts
! Analyzing the diagnostics
• Application of hardware interrupts (see chapter 8)
! Parameterization of hardware interrupts
! Configuration and analysis of hardware interrupts

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4 Mechanical setup of the sample station
The setup of the sample station is divided into two steps. First, the setup of
the power supply and the CPU is explained. After becoming acquainted
with the analog module SM331 the mounting of it is described.
4.1 Mounting the sample station
Before you can use the analog input module SM331, you need a basic
setup of general SIMATIC S7-300 components.
The order of the mounting takes place from left to right:
• Power supply PS307
• CPU 315-2DP
• SM331
Table 4-1 Mounting the sample station (without SM331)
Graphics Description
Bolt together the rail to the ground or underground (screw
size: M6) so that at least 40 mm space remains above and
below the rail
If the base is a grounded sheet metal or a grounded
mounting plate, ensure that the rail and the base are con-
nected together with low resistance.
Connect the rail with the protective ground wire. A M6 bolt
is available for this purpose.
Mounting the power supply
• Hang the power supply to the top end of the rail
• and tighten it to the rail underneath

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Graphics Description
Connect the bus connector (delivered with the SM331) to
the left connector on the back of the CPU
Mounting the CPU:
• Hang the CPU to the top end of the rail
• Push it all the way left to the power supply
• Push it down
• and tighten the screw to the rail underneath

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4.2 Mounting the analog module
Before the actual mounting of the SM331 the module has to be completed
with a front connector and the desired measurement mode of the inputs is
set.
In this section you will learn
• Which components you need
• What are the properties of the analog input module
• What a measuring range module is and how it is set up
• How you mount the already setup module
4.2.1 Components of the SM331
A functional analog module consists of the following components:
• Module SM331 (in our example 6ES7331-7KF02-0AB0)
• 20-pin front connector. There are two different types of front connectors:
▪With spring contacts (Order number 6ES7392-1BJ00-0AA0)
▪With screw contacts (Order number 6ES7392-1AJ00-0AA0)
Figure 4-1 Components of the SM331

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Table 4-2 The scope of delivery of SM331
Components
Module
Labeling strips
Bus connector
2 cable ties (not in the picture) to tie the external wiring
4.2.2 Properties of the analog module
• 8 inputs in 4 channel groups (each group with two inputs of same type)
• Measurement resolution adjustable for each channel group
• User defined measuring mode per channel group:
▪Voltage
▪Current
▪Resistance
▪Temperature
• Configurable diagnostic interrupt
• Two channels with limit value interrupt (Only channel 0 and channel 2
are configurable)
• Electrically isolated against backplane bus
• Electrically isolated against load voltage (exception: At least one module
is set to position D)
The module is a universal analog module designed for the most commonly
used applications.
The desired measuring mode should be set up directly on the module with
the measuring range modules (see chapter 4.2.3)

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4.2.3 Measuring range modules
The module SM331 has four measuring range modules (one per channel
group). The measuring range modules can be set to 4 different positions
(A, B, C or D). With the set position you determine which transducer can
be connected to the respective channel group.
Figure 4-2 4 measuring range modules with default setting B (Voltage)
Table 4-3 Positions of the measuring range modules
Position Measurement type
A Thermocouple / Resistance measurement
B Voltage (default setting)
C Current (2-wire transducer)
D Current (4-wire transducer)
Measuring mode A-D
Measuring range module
Channel group
Position B (voltage) set
for CH6, 7

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In our example, a sensor with a 4 to 20mA 2-wire transducer is connected
to channel group 1 at input 0.
A 4-wire transducer is connected to channel group 2 at inputs 2 and 3.
Therefore, the first measuring range module should have Position D and
the second should have Position C
Table 4-4 Positioning of the measuring range modules
Graphics Description
With a screwdriver, pull out the two measur-
ing range modules
Turn the measuring range module to the
desired position:
Plug the measuring range module back into
the module
In our example, the module should have the
following positions:
CH0,1: D
CH2,3: C
Note
When you use a 2-wire transducer, the electrical isolation against the load voltage
is lost for all the channels in the module (at least one measuring range module is
set to position D)

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4.2.4 Mounting the SM331 module
After you have prepared the analog module accordingly, mount it to the rail
as well.
Table 4-5 Mounting the SM331 module
Graphics Description
Mounting the SM331:
• Insert the SM331 to the top part of the rail
• Push it all the way left to the CPU
• Push down
• and tighten the screw at the bottom to the rail
Mounting of the front connectors:
• Press the upper release button of the front
terminal block
• Insert the front connector into the module until
it snaps in
Mechanically the sample station is now completely mounted.

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5 Electrical connection
This chapter shows you how the various parts of the sample station are
electrically wired from the power supply to the analog module.
!
Warning
You might get an electrical shock if the power supply PS307 is turned on or the
power cord is connected to the line.
Wire the S7-300 only in power-off state.
5.1 Wiring the power supply and the CPU
Figure 5-1 Wiring the power supply and the CPU

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The sample station requires a power supply. The wiring is done as follows:
Table 5-1 Wiring the power supply and the CPU
Step Graphics Description
1 Open the front flaps of the power supply and the CPU
2 Unscrew the pull relief bracket on the power supply
3
Remove the insulation from the power cord, attach the
cable end sleeves (for multi-wire cords) and connect it to
the power supply
4
Tighten the pull relief bracket
5 Insert two connecting cables between the power supply
and the CPU and tighten them
6 Confirm that the setting of the voltage selector is set to
your local line voltage.
The power supply’s default setting is AC 230 V.
If you have to change this setting, do the following:
Remove the protective cap with a screwdriver, adjust the
switch according to your line voltage and put the protec-
tive cap back.

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5.2 Wiring the analog module
The wiring of an analog measurement transducer is dependant on its type
and not on the SM331 module.
5.2.1 Current transducer wiring - Principle
Depending on the current transducer you use, you have to modify the wir-
ing of the power supply. We differentiate between the wiring of a 2-wire cur-
rent transducer and a 4-wire current transducer.
Wiring principles of a 2-wire current transducer
This transducer type is supplied with power from the analog input module.
Lo-
gic
Backpl
ane
bus
L+
M
ana
M
ADU
M+
M-
2-wire
transducer +
-
P
Sensor,
e.g. pressure
sensor
P2-wire
transducer
M+
M-
+
-
Figure 5-2 Wiring: 2-wire current transducer
Wiring principles of a 4-wire current transducer
Unlike a 2-wire transducer, this transducer has its own power supply.
Lo-
gic
Backpla
ne bus
L+
M
ana
M
ADU
M+
M-
+
-
+
-
P
P
Sensor,
e.g.pressure
sensor
4-wire
transducer
L+ M
M+
M-
Figure 5-3 Wiring: 4-wire current transducer

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5.2.2 Wiring of the analog module
The wiring of the analog module consists of the following tasks:
• Connection of the power supply (Red cable)
• Connection of the 2-wire current transducer (Green cables)
• Terminate unused channels with a resistor
• Connection of the first 4-wire current transducer (Green cables)
• Connection of the second 4-wire current transducer (Green cables)
• Connection to zero potential and short-circuit the other unused channels
(blue wires)
Figure 5-4 SM331 Front connector wiring
Warning
Possible destruction of the module!
If you connect a defective 4-wire current transducer to an input, which is configured
for a 2-wire transducer, the module might get destroyed.