S7-300/S7-300F - GRAM Industrial: Automation...

Page 1028 Mar 2008 Siemens ITS

S7-300/S7-300F

OverviewS7-300The modular mini PLC system for the low and mid-performance rangesWith comprehensive range of modules for optimum adaptation to the automation taskFlexible use through simple implementation of distributed structures and versatile networkingUser-friendly handling and uncomplicated design without a fanCan be expanded without problems when the tasks increasePowerful thanks to a range of integrated functions

S7-300F

Failsafe automation system for plants with increased safety requirements for production technologyBased on S7-300Additional ET 200S and ET 200M distributed I/O stations complete with safety-related modules can be connectedSafety-related communication via PROFIBUS DP with PROFIsafe profileStandard modules can be used in addition for non-safety-relevant applications


Application

S7-300The 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 makethe SIMATIC S7-300 the cost-effective and user-friendly solution for the most diverse tasks in the low-end and midperformance ranges.

Application areas of the SIMATIC S7-300 include: Special machinery, Textile machinery, Packaging machinery, General mechanical equipment manufacture, Controller building, Machine tool manufacture, Installation systems, Electrical/electronics industry and the skilled trades.

Several performance-graded CPUs and a comprehensive range of modules with a host of user-friendly functionsallow you to use only those modules necessary for your application. In the case of task expansions, the controllercan be upgraded at any time by means of additional modules.

The SIMATIC S7-300 is universal in use:

Maximum suitability for industry thanks to high electromagnetic compatibility and high resistance to shock andvibration.


S7-300F

The SIMATIC S7-300F fail-safe automation system is used in plants with increased safety requirements. It controlsprocesses where immediate shutdown presents no danger to personnel or the environment.

The S7-300F meets the following safety requirements:

Requirement class AK 1 to AK 6 in accordance with DIN V 19250/DIN V VDE 0801 Safety requirement class SIL 1 to SIL 3 in accordance with IEC 61508 Category 1 to 4 in accordance with EN 954-1

In addition, standard modules can be used in the S7-300F as well as the fail-safe modules. This makes it possible toestablish 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.


DesignS7-300General

The S7-300 automation system is modular in design. It has a comprehensive range of modules that can be combinedindividually.

A system includes the following: A CPU:

Different CPUs are available for different performance ranges, including CPUs with integral inputs/outputs and thecorresponding functions, as well as CPUs with integral PROFIBUS DP, PROFINET and point-to-point interfaces.

Signal modules (SMs) for digital and analog inputs/outputs. Communications processors (CPs) for bus connection and point-to-point connections. Function modules (FMs) for high-speed counting, positioning (open-loop/closed-loop) and PID control.

The following can also be used depending on requirements:

Load power supply (PS) for connecting the SIMATIC S7-300 to a supply voltage of 120/230 V AC. Interface modules (IMs) for connecting the central controller (CC) and expansion units (EUs) in multi-tier

configurations.The SIMATIC S7-300 can be operated with up to 32 modules distributed across the CC and 3 EUs. All modulescan be operated in enclosures and without fans.

SIPLUS modules for extended environmental conditions:suitable for temperature range -25 to +60 °C, and higher humidity, condensation and frost loads. Can be used directon vehicles or outside building in an IP20 cabinet protected against direct sunlight and rainwater/spray water. Air-conditioned cabinet and IP65 housing not required.


Design

Simple design makes the S7-300 flexible and service-friendly:

Module mounting:Simply hang the modules on the mounting rail, swing them into place and screw into position.

Integral backplane bus:The backplane bus is integrated into the modules. The modules are connected via bus connectors plugged intothe rear of the housings.

Simple replacement of the modules with mechanical key coding:Only the fixing screw of the modules has to be unscrewed to replace the module. Wired front connectors areeasy to release by pressing on the locking mechanism. The front connector coding prevents connection of thewired front connector to the wrong module type.

Field-proven connections:Screw-type or spring-loaded front connectors are offered for the signal modules.

TOP Connect:This offers pre-assembled wiring with 1-core to 3-core connections and screw-type or spring-loaded terminals.Alternative to wiring direct on the signal module.

Defined installation depth:All connections and connectors are recessed into the modules and protected and covered by front doors. Allmodules thus have a defined installation depth.

No slot rules:Signal modules and communications processors can be connected in any way without restrictions. The systemconfigures itself.


Expansion

If users require more than 8 slots SM, FM or CP modules for their automation tasks, the S7-300 (exceptCPU 312 and CPU 312C) can be expanded:

Max. 32 modules on CC and 3 EUs: In total, a maximum of 3 expansion units (EUs) can be connected to the central controller (CC). Eight

modules can be connected to each CC/EU. Connection via interface modules:

Each CC/EU has its own interface module. It is always plugged into the slot next to the CPU on the CC,and it handles communication with the EUs autonomously. Expansion via IM 365:

1 EU, distance max. 1 m; supply voltage is also transferred. Expansion via IM 360/361:

3 EUs, max. distance between CC and EU and between EU and EU, 10 m in each case. Physically separate installation:

The individual CCs/EUs can also be installed at greater distances from each other. Distance between twoneighboring CC/EU or EU/EU: max. 10 m.

Flexible mounting options:The CCs/EUs can be mounted horizontally or vertically. They can thus adapt optimally to the availablespace.


CommunicationThe S7-300 has different communication interfaces:

Communications processors for connecting to the bus systems AS-Interface, PROFIBUS andPROFINET/Industrial Ethernet.

Communications processors for point-to-point connections. Multipoint interface (MPI ), integrated into the CPU;

the low-cost solution for simultaneous connection of PGs/PCs, HMI systems and other SIMATIC S7/C7automation systems.

Process communication via PROFIBUS DPThe SIMATIC S7-300 is connected to the PROFIBUS DP bus system via a communications processor or theCPUs with integral PROFIBUS DP interface. The CPUs with PROFIBUS DP master/slave interface enabledistributed 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 (sameconfiguring, addressing and programming).The following can be connected as masters:

SIMATIC S7-300(via CPUs with PROFIBUS DP interface or PROFIBUS DP CPs)

SIMATIC S7-400(via CPUs with PROFIBUS DP interface or PROFIBUS DP CPs)

SIMATIC C7(via C7 with PROFIBUS DP interface or PROFIBUS DP CPs)

SIMATIC S5-115U/H, S5-135U and S5-155U/H with IM 308 SIMATIC 505


For performance reasons, no more than 2 masters must be connected on one line.The following can be connected as slaves:

ET 200 distributed I/O devices S7-300 via CP 342-5 CPU 313C-2 DP, CPU 314C-2 DP, CPU 314C-2 PN/DP, CPU 315-2 DP, CPU 315-2 PN/DP, CPU 317-2 DP,

CPU 317-2 PN/DP and CPU 319-3 PN/DP C7-633/P DP, C7-633 DP, C7-634/P DP, C7-634 DP, C7-626 DP, C7-635, C7-636 Field devices

Although PG/PCs with STEP 7 or OPs are masters on the bus, they only use the MPIfunctions 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 withintegral PROFINET interface. The CPUs with PROFINET interface enable distributed automation configurations withhigh speed and simple handling.The distributed I/O via PROFINET IO is treated just like a centralized I/O from the user's perspective (sameconfiguring, addressing and programming).

The following can be connected as IO controllers:


SIMATIC S7-300(via CPUs with PROFINET interface or PROFINET CPs)

SIMATIC ET 200(via CPUs with PROFINET interface)

SIMATIC S7-400(via CPUs with PROFINET interface or PROFINET CPs)

The following can be connected as IO devices:

ET 200 distributed I/O devices ET 200S IM151-8 PN/DP CPU, ET 200pro IM154-8 PN/DP CPU SIMATIC S7-300

(via CPUs with PROFINET interface or PROFINET CPs) Field devices

Process communication via AS-Interface

The S7-300 has a suitable communications processor (CP 342-2) for connecting field devices (AS-Interface slaves) forthe 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 processorsor the integral interface of the CPU 313C-2 PtP or CPU 314C-2 PtP. Different protocols with the three physicaltransmission media are available:

20 mA (TTY) (CP 340/CP 341 only) RS 232C/V.24 (CP 340/CP 341 only) RS 422/RS 485

The following can be connected:

SIMATIC S7 and SIMATIC S5 automation systems and non-Siemens systems Printers Robot controls Scanners, barcode readers, etc.

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. Itcan be used for simple networking.


The MPI enables simultaneous connection of several PGs/PCs with STEP 7, HMI systems (OP/OS), S7-300 andS7-400.

Global data:With the "Global data communication" service, networked CPUs can exchange data with each other cyclically.An S7-300 CPU can exchange up to 4 packets of 22 bytes each, with a maximum of 16 CPUs participating in thedata exchange (with STEP 7 V4.x).This allows, for example, one CPU to access the inputs/outputs of another CPU. Global data communication canonly take place via the MPI interface.

Internal communications bus (C bus):The MPI of the CPU is connected direct with the C bus of the S7-300. FM/CP modules with C bus connectioncan thus be addressed direct from the PG via the MPI.

Powerful communications technology: Up to 32 MPI nodes. Several communication connections per CPU for S7 basic communication with the SIMATIC S7-300/-400. Several communication connections per CPU for S7 communication with PGs/PCs, SIMATIC HMI

systems, and the SIMATIC S7-300/400. Data transfer rate 187.5 kbit/s or 12 Mbit/s

Flexible configuration options:Field-proven components are used to establish MPI communication: Bus cable, bus connectors and RS 485repeaters from the PROFIBUS and "distributed I/O" ranges. They enable optimal adaptation of the design to therequirements. For example, up to 10 repeaters can be switched in series to bridge larger distances between anytwo MPI

nodes.


Data communication via CP

The SIMATIC S7-300 can be connected to the PROFIBUS and Industrial Ethernet bus systems via the CP 342 andCP 343 communications processors.

The following can be connected:

SIMATIC S7-300 SIMATIC S7-400 SIMATIC S5-115U/H, S5-135U, S5-155U/H Programming devices Personal computers SIMATIC HMI human machine interface systems Numerical controllers Robot controls Industrial PCs Drive controls Devices of other manufacturers

S7-300FThe S7-300F can be operated with two I/O designs: Design with I/O in ET 200M:

Fail-safe digital/analog input and output modules for centralized or distributed use (Cat.4/SIL3 only inconjunction with isolating module).

Design with I/O in ET 200S PROFIsafe:Fail-safe digital input and output modules for distributed use


Function

S7-300

A host of features support users in programming, commissioning and servicing the S7-300.

High-speed instruction processing:Instruction execution times from 4 ns open up completely new application options in the low-end and midperformance range.

Floating-point arithmetic:With floating-point arithmetic, even complex arithmetic functions can be used effectively.

User-friendly parameter assignment:There is only one single software tool with a uniform operator interface for parameterizing all modules. This saveson induction and training overhead.

Human machine interfacing (HMI):User-friendly HMI services are already integrated into the operating system of the S7-300. Costly programming ofthese functions is no longer necessary: The SIMATIC HMI system requests process data from the SIMATIC S7-300 — the S7-300 transfers this data at the desired update times. The operating system of the SIMATIC S7-300handles the transfer autonomously. And all with uniform symbols and database.

Diagnostics functions:The intelligent diagnostics system of the CPUs continuously checks the functionality of the system and registersfaults and specific system events (e.g. time errors, module failure, etc.). The events are stored in a ring buffer andtime-stamped for future troubleshooting.

Password protection:Password protection allows users to protect their know-how effectively against

unauthorized copying and modification.


The SIMATIC S7-300 complies with national and international standards:

CE mark UL approval CSA approval cULus approval cULus HAZ.LOC. approval FM approval ATEX approval Marking for Australia IEC 61131 Marine approval

ABS (American Bureau of Shipping) BV (Bureau Veritas) DNV (Det Norske Veritas) GL (Germanischer Lloyd) LRS (Lloyds Register of Shipping) Class NK (Nippon Kaiji Kyokai)

For details, refer to Manual "SIMATIC S7-300 Programmable Controller S7-300 Module Data" under "1. Generaltechnical data / 1.1 Standards and approvals".


Communication

The CPUs of the SIMATIC S7-300 support the following communication types:

Process communication:For cyclic addressing of I/O modules (exchange of the process image) via a bus (AS-Interface,PROFIBUS DP or PROFINET). Process communication is called up from the cyclic execution levels.

Data communication: For data exchange between automation systems or between HMI stations and several automation systems.

Data communication takes place cyclically or it is called from the user program via blocks on an event-drivenbasis.

The user-friendly STEP 7 operator interface that significantly simplifies configuring isavailable to users for configuring the communication functions.

Data communication

The SIMATIC S7-300 has different data communication mechanisms:

Cyclic exchange of data packets between CPUs networked via MPI with global data communication. Event-driven communication with other partners with the communication functions. Networking can take

place via MPI, PROFIBUS or PROFINET.


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, bitmemories 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 functionsCommunication services with S7/C7 partners can be established with system-integrated blocks.

The services are:

S7 basic communication via MPI. S7 communication via MPI, C bus, PROFIBUS and PROFINET/Industrial Ethernet.

The S7-300 can be used:

as a server via MPI, C bus and PROFIBUS as a server or client via the integral PROFINET interface

Communication services with S5 partners and non-Siemens devices can be established with reloadable blocks.

The services are:

S5-compatible communication via PROFIBUS and Industrial Ethernet. Standard communication (non-Siemens systems) via PROFIBUS and Industrial Ethernet.


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 ITfunctions are possible via the CP 343-1 Advanced:

IP routing;forwarding of IP V4 messages from the Gigabit to the PROFINET interface controlled via the IP access list

WEB server;up to 30 MB of freely definable HTML pages can be called up via a standard browser; data handling of yourown file system via FTP

Standard diagnostics pages;for high-speed diagnostics in the plant for all modules plugged into the mounting rack, without additional tool

E-mails;Sending of e-mails with authentication direct from the user program. The e-mail client function makes itpossible to alert users direct from the control program

Communication via FTP;open protocol available on most operating system platforms

The 30 MB RAM file system can be used for intermediate storage of dynamic data.


The S7-300 PROFINET CPUs have an integral Web server. Information can thus be read out of the S7-300 stationusing a standard Web browser:

General CPU information Content of the diagnostics buffer Variable table Tag status Module status Alarms Information on Industrial Ethernet Topology of the PROFINET nodes

Via the user-defined pages, write access via the Web server to the S7-300 CPU is also possible.

Isochronous mode

The system function isochronous mode enables synchronous coupling

of the distributed signal acquisition, the signal transmission via PROFIBUS/PROFINET and the program execution


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 constantintervals (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 ensuresprecisely reproducible and defined process response times.An extensive range of components that support the isochronous mode system function is available for handlingdemanding 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 meansincreased production with optimal and constant quality.

Diagnostics and process monitoring of modules

Many input/output modules of the SIMATIC S7-300 have intelligent capabilities:

Monitoring of signal acquisition (diagnostics). Monitoring of signals from the process (hardware interrupt).


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 betweenparameterizable and non-parameterizable diagnostics messages:

Parameterizable diagnostics messages:The diagnostics message is only sent if it has been enabled by the appropriate parameterization.

Non-parameterizable diagnostics messages:These messages are sent as a matter of course, that is, independently of parameterization.

If a diagnostics message is active (e.g. "No sensor supply”), the module triggers a diagnostics interrupt (if thediagnostics message is parameterized, only after the appropriate parameterization). The CPU interrupts processing ofthe user program or low priority classes, and processes the relevant diagnostics interrupt block (OB 82).

Digital input/output modulesDiagnostics message Possible fault causeNo sensor supply •Sensor supply overload

•Short-circuit of the sensor supply to M


No external auxiliary voltage •No supply voltage L+ of the moduleNo internal auxiliary voltage •No supply voltage L+ of the module

•Internal module fuse defectiveFuse blown •Internal module fuse defectiveIncorrect parameters in module •Incorrect parameters transferred to moduleTime monitoring addressed (watchdog) •Periodically high electromagnetic interference

•Module defectiveEPROM fault •Periodically high electromagnetic interference

•Module defectiveRAM fault •Periodically high electromagnetic interference

•Module defectiveHardware interrupt lost •Hardware interrupts come faster than the CPU

can process them

Analog output modulesDiagnostics message Possible fault causeNo external load voltage •No load voltage L+ of the moduleConfiguring/parameterization errors •Incorrect parameters transferred to moduleShort-circuit to M •Output overload

•Short-circuit of the output QV to MANAWirebreak •Resistance of actuator too high

•Interruption of the line between the module andthe actuator•Channel not used (open)


Analog input modulesDiagnostics message Possible fault causeNo external load voltage •No load voltage L+ of the moduleConfiguring/parameterization errors •Incorrect parameters transferred to moduleCommon mode error •Difference in potential UCM between the inputs

(M-) and reference potential of the measuringcircuit (MANA) too high

Wirebreak •Resistance of sensor circuit too high•Interruption of the line between the module andthe sensor•Channel not switched (open)

Measuring range low limit violated •Input value lower than the underrange, faultpossibly caused by

• Measuring range 4 to 20 mA, 1 to 5 V:sensor connected with reverse polarity;wrong measuring range selected

• Other measuring ranges:wrong measuring range selected

Measuring range high limit violated •Input value exceeds overrange


Hardware interrupt

Process signals can be monitored via hardware interrupts and responses to changes in the signals can be triggered.

Digital input modules:Depending on the parameterization, the module can trigger a hardware interrupt for each channel group optionallyat a rising edge, a falling edge or at both edges of a signal status change. The CPU interrupts processing of the userprogram or low priority classes, and processes the relevant diagnostics interrupt block (OB 40). The signal modulecan buffer one interrupt per channel.

Analog input modules:A working range is defined by parameterizing an high and low limit value. The module compares the digitizedmeasured value with these limits. If the measured value violates one of these limits, a hardware interrupt istriggered. The CPU interrupts processing of the user program or low priority classes, and processes the relevantdiagnostics interrupt block (OB 40). If the limits are above/below the overrange/underrange, no comparison ismade.

S7-300F

Mode of operation

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 andchronological 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.


Programming

The safety-related programs for the CPU 315F are programmed with the STEP 7 languages LAD and FBD. Thescope of functions with regard to operations and data types is restricted here. A safety-related program is created bymaking special specifications at the compiling stage. As well as the fail-safe program, a standard program can alsorun 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-acceptedprogramming examples for safety-related functions. These programming examples can be modified but themodifications 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. Thepackage contains all the necessary functions and blocks for creating the F program. STEP 7 from V5.1SP3 must beinstalled for S7 F Distributed Safety to run.

Technical specifications


General technical dataDegree of protection IP20 according to IEC 60 529Ambient temperature•For horizontal installation 0 to 60 °C•For vertical installation 0 to 40 °CRelative humidity 10 to 95%, without condensation, corresponds to

relative humidity (RH), stress level 2 acc. to IEC61131, Part 2)

Air pressure From 1080 to 795 hPa (corresponds to an altitude of-1000 to +2000 m)

Insulation•< 50 V 500 V DC test voltage•< 150 V 2500 V DC test voltage•< 250 V 4000 V DC test voltageElectromagnetic compatibility Requirements of the EMC directive;

interference immunity according to IEC 61000-6-2•Pulse-shaped disturbance variables Test according to:

Electrostatic discharge according to IEC 61000-4-2,burst pulses according to IEC 61000-4-4,energy single pulse (surge) according to IEC 61000-4-5,

Technical specifications


•Sinusoidal disturbance variables Test according to:HF irradiation according to IEC 61000-4-3,HF decoupling according to IEC 61000-4-6

•Emission of radio interference Interference emission according to EN 50081-2Test according to:Emitted interference of electromagnetic fieldsaccording to EN 55016:Limit value class A, (measured at a distance of 10 m)Interference emission via AC mains according to EN55011:Limit value class A, Group 1

Mechanical strength•Vibrations Frequency range 10 Hz ≤ f ≤ 58 Hz

•Continuous: 0.0375 mm amplitude•Occasionally 0.75 mm amplitudeFrequency range 58 Hz ≤ f ≤ 150 Hz•Continuous: 0.5 g constant acceleration•Occasionally 1 g constant accelerationTesting according to IEC 60068-2-6Tested with:5 Hz ≤ f ≤ 9 Hz, constant amplitude 3.5 mm;9 Hz ≤ f ≤ 150 Hz, constant acceleration 1 g;


Duration of oscillation: 10 frequency passes per axisin each direction of the 3 mutually perpendicularaxes

•Shock Testing according to IEC 60068-2-27Tested with:Half-sine wave:strength of shock 15 g peak value, 11 ms duration;Shock direction: 3 shocks each in ± direction in eachof the 3 mutually vertical axes

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