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You can also find information about SIMATIC S7-300 in Catalog ST 70:
http://www.automation.siemens.com/salesmaterial-as/catalog/en/simatic-st70-chap05-english-2015.pdf
The SIMATIC S7-300 is the modular mini PLC system for the low-end and mid performance ranges.
The modular and fan-free design, simple implementation of distributed structures, and convenient handling make the SIMATIC S7-300 the cost-effective and user-friendly solution for the most diverse tasks in the low-end and mid performance ranges.
Application areas of the SIMATIC S7-300 include:
Several performance-graded CPUs and a comprehensive range of modules with a host of user-friendly functions allow you to use only those modules necessary for your application. In the case of task expansions, the controller can be upgraded at any time by means of additional modules.
The SIMATIC S7-300 is universal in use:
The SIMATIC S7-300F fail-safe automation system is used in plants with increased safety requirements. It controls processes where immediate shutdown presents no danger to personnel or the environment.
The S7-300F meets the following safety requirements:
In addition, standard modules can be used in the S7-300F as well as the fail-safe modules. This makes it possible to establish a fully integrated control system for a plant where non-safety related tasks and safety-related tasks co-exist. The overall plant is configured and programmed with the same standard tools.
General
The S7-300 automation system is modular in design. It has a comprehensive range of modules that can be combined individually.
A system includes the following:
The following can also be used depending on requirements:
Design
Simple design makes the S7-300 flexible and service-friendly:
Expansion
If users require more than 8 slots SM, FM or CP modules for their automation tasks, the S7-300 (except CPU 312 and CPU 312C) can be expanded:
Communication
The S7-300 has different communication interfaces:
Process communication via PROFIBUS DP
The SIMATIC S7-300 is connected to the PROFIBUS DP bus system via a communications processor or the CPUs with integral PROFIBUS DP interface. The CPUs with PROFIBUS DP master/slave interface enable distributed automation configurations with high speed and simple handling.
The distributed I/O via PROFIBUS DP is treated just like a centralized I/O from the user’s perspective (same configuring, addressing and programming).
The following can be connected as masters:
For performance reasons, no more than 2 masters must be connected on one line.
The following can be connected as slaves:
Although PG/PCs with STEP 7 or OPs are masters on the bus, they only use the MPI functions that also run in part via PROFIBUS DP.
Process communication via PROFINET IO
The SIMATIC S7-300 is connected to the PROFINET IO bus system via a communications processor or the CPUs with integral PROFINET interface. The CPUs with PROFINET interface enable distributed automation configurations with high speed and simple handling.
The distributed I/O via PROFINET IO is treated just like a centralized I/O from the user’s perspective (same configuring, addressing and programming).
The following can be connected as IO controllers:
The following can be connected as IO devices:
Process communication via AS-Interface
The S7-300 has a suitable communications processor (CP 342-2) for connecting field devices (AS-Interface slaves) for the AS-Interface-Bus.
For additional information, see Communications processors.
Data communication via CP or integral interface (point-to-point)
Point-to-point connections can be conveniently and at low cost via the CP 340/CP 341 communications processors or the integral interface of the CPU 313C-2 PtP or CPU 314C-2 PtP. Different protocols with the three physical transmission media are available:
The following can be connected:
Special blocks are included in the scope of supply of the manuals for the communication functions.
Data communication via multipoint interface (MPI)
The multipoint interface (MPI) is a communication interface integrated into the CPUs of the SIMATIC S7-300. It can be used for simple networking.
Data communication via CP
The SIMATIC S7-300 can be connected to the PROFIBUS and Industrial Ethernet bus systems via the CP 342 and CP 343 communications processors.
The following can be connected:
The S7-300F can be operated with two I/O designs:
S7-300
A host of features support users in programming, commissioning and servicing the S7-300.
The SIMATIC S7-300 complies with national and international standards:
For details, refer to Manual “SIMATIC S7-300 Programmable Controller S7-300 Module Data” under “1. General technical data / 1.1 Standards and approvals”.
The CPUs of the SIMATIC S7-300 support the following communication types:
The user-friendly STEP 7 operator interface that significantly simplifies configuring is available to users for configuring the communication functions.
Data communication
The SIMATIC S7-300 has different data communication mechanisms:
Global data
With the “Global data communication” service, networked CPUs can exchange data with each other cyclically (max. 8 GD packets with 22 bytes each per cycle). This allows, for example, one CPU to access the data, bit memories and process image of another CPU. Global data communication can only take place via the MPI. Configuring is carried out using the GD table in STEP 7.
Communication functions
Communication services with S7/C7 partners can be established with system-integrated blocks.
The services are:
Communication services with S5 partners and non-Siemens devices can be established with reloadable blocks.
The services are:
In contrast to global data, communication connections must be set up for the communication functions.
Integration into the IT world
The S7-300 makes it possible to simply link the modern IT world with automation engineering. The following IT functions are possible via the CP 343-1 Advanced:
The S7-300 PROFINET CPUs have an integral Web server. Information can thus be read out of the S7-300 station using a standard Web browser:
Via the user-defined pages, write access via the Web server to the S7-300 CPU is also possible.
The system function isochronous mode enables synchronous coupling
for the PROFIBUS/PROFINET constant bus cycle time.
An automation solution is created that captures and processes the input signals and outputs output signals at constant intervals (constant bus cycle time). A consistent partial process image is created at the same time.
By means of constant bus cycle times and synchronous signal processing of the distributed I/O, the S7-300 ensures precisely reproducible and defined process response times.
An extensive range of components that support the isochronous mode system function is available for handling demanding tasks from the areas of motion control, measured value acquisition, high-speed controls, etc.
In distributed automation solutions, the SIMATIC S7-300 now also opens up the important application area of high-speed processing operations and enables the achievement of maximum precision and reproducibility. This means increased production with optimal and constant quality.
Many input/output modules of the SIMATIC S7-300 have intelligent capabilities:
Diagnostics
Diagnostics can be used to determine whether signal acquisition (in the case of digital modules) or analog processing (analog modules) of the module is functioning fault-free. In diagnostics analysis, a distinction must be made between parameterizable and non-parameterizable diagnostics messages:
If a diagnostics message is active (e.g. “No sensor supply”), the module triggers a diagnostics interrupt (if the diagnostics message is parameterized, only after the appropriate parameterization). The CPU interrupts processing of the user program or low priority classes, and processes the relevant diagnostics interrupt block (OB 82).
Digital input/output modules |
|
Diagnostics message |
Possible fault cause |
No sensor supply |
|
No external auxiliary voltage |
|
No internal auxiliary voltage |
|
Fuse blown |
|
Incorrect parameters in module |
|
Time monitoring addressed (watchdog) |
|
EPROM fault |
|
RAM fault |
|
Hardware interrupt lost |
|
Analog input modules |
|
Diagnostics message |
Possible fault cause |
No external load voltage |
|
Configuring/parameterization errors |
|
Common mode error |
|
Wirebreak |
|
Measuring range low limit violated |
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Measuring range high limit violated |
|
Analog output modules |
|
Diagnostics message |
Possible fault cause |
No external load voltage |
|
Configuring/parameterization errors |
|
Short-circuit to M |
|
Wirebreak |
|
Hardware interrupt
Process signals can be monitored via hardware interrupts and responses to changes in the signals can be triggered.
The safety functions of the S7-300F are contained in the F program of the CPU and in the fail-safe signal modules.
The signal modules monitor output and input signals by means of discrepancy analyses and test signal injections.
The CPU checks the proper operation of the controller with regular self-tests, command tests, and logical and chronological program execution checks. In addition, the I/O is checked by means of sign-of-life requests.
If a fault is diagnosed in the system, the system is brought to a safe state.
The safety-related programs for the CPU 315F are programmed with the STEP 7 languages LAD and FBD. The scope of functions with regard to operations and data types is restricted here. A safety-related program is created by making special specifications at the compiling stage. As well as the fail-safe program, a standard program can also run in parallel on one CPU (coexistence) with no restrictions.
An additional component part of this software package is the F library with off-the-shelf, TÜV-accepted programming examples for safety-related functions. These programming examples can be modified but the modifications must be re-certified.
S7 F Distributed Safety option package
The option package “S7 F Distributed Safety” is required for programming the safety-related program sections. The package contains all the necessary functions and blocks for creating the F program. STEP 7 from V5.1SP3 must be installed for S7 F Distributed Safety to run.
General technical data |
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Degree of protection |
IP20 according to IEC 60 529 |
Ambient temperature |
|
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0 to 60 °C |
|
0 to 40 °C |
Relative humidity |
10 to 95%, without condensation, corresponds to relative humidity (RH), stress level 2 acc. to IEC 61131, Part 2) |
Air pressure |
From 1080 to 795 hPa (corresponds to an altitude of -1000 to +2000 m) |
Insulation |
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500 V DC test voltage |
|
2500 V DC test voltage |
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4000 V DC test voltage |
Electromagnetic compatibility |
Requirements of the EMC directive; |
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Test according to: |
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Test according to: |
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Interference emission according to EN 50081-2 Test according to: Interference emission via AC mains according to EN 55011: |
Mechanical strength |
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Frequency range 10 Hz ≤ f ≤ 58 Hz
Frequency range 58 Hz ≤ f ≤ 150 Hz
Testing according to IEC 60068-2-6 5 Hz ≤ f ≤ 9 Hz, constant amplitude 3.5 mm; Duration of oscillation: 10 frequency passes per axis in each direction of the 3 mutually perpendicular axes |
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Testing according to IEC 60068-2-27 Half-sine wave: Shock direction: 3 shocks each in ± direction in each of the 3 mutually vertical axes |