Safety Instrumented System SIS Module CPU315f-2dp

Safety Instrumented System SIS Module CPU315f-2dp

1、 Overview of Safety Instrumented System SIS Module CPU315F-2dP

SIMATIC S7-300, CPU 315F-2DP fail safe module with MPI integrated power supply 24V DC, main memory 384 KB, 40mm wide, 2 DP Master/Slave interfaces requiring micro memory cards, order number: 6ES7315-6FF04-0AB0.

Based on SIMATIC CPU 315-2 DP, it is used to establish a fail safe automation system, suitable for factories that add safety instrumented systems (SIS). The safety level can reach SIL 3 (IEC 61508) and PL e (ISO 13849.1). Distributed fail safe I/O modules can be connected through an integrated PROFIBUS DP interface (PROFIsafe), and fail safe ET 200M I/O modules can also be centrally connected. For non safety applications, standard modules can be used in a centralized and distributed manner. The operation of the CPU requires SIMATIC miniature memory cards.

2、 Application of Safety Instrumented System SIS Module CPU315f-2dp

The CPU 315F-2 DP supports the establishment of a fail safe automation system to meet the growing safety needs, particularly suitable for production engineering.

Distributed I/O stations, including fail safe I/O modules, can be connected through the built-in PROFIBUS DP interface. The ET 200M fault-tolerant I/O module can meet safety related applications. The safety related communication between the CPU315F CPU and the fail safe I/O module is achieved through PROFIsafe.

3、 Design of Safety Instrumented System SIS Module CPU315F-2dP

The CPU 315F-2 DP has the following characteristics:

1. Microprocessor:
The processor takes 50 ns to process a binary instruction and 0.45 µ s to process each floating-point operation.

2. Memory:
384 KB high-speed RAM, used for secure program segments and standard program segments; If executing a secure program segment, additional memory space requirements (more than 5 times) must be considered. Out of 384 KB of RAM, 128 KB of data storage is available for standard applications. SIMATIC miniature memory cards (up to 8 MB) serve as loading memory for programs and also allow items (including symbols and annotations) to be stored in the CPU.

3. Flexible scalability:
Up to 32 modules can be used (4-layer configuration)

4. MPI multi-point interface:
The integrated MPI interface can be simultaneously established with S7-300/400 or programmers at most PC、 The 16 way connection of the operator panel. In these connections, always reserve one connection each for the programmer and operator panel. Through 'global data communication', MPI can be used to establish a simple network consisting of up to 16 CPUs.

5. PROFIBUS DP interface:
The CPU 315F-2 DP with PROFIBUS DP master/slave interface can be used to establish high-speed and easy-to-use distributed automation systems. From the user's perspective, handle distributed I/O in the same way as centralized I/O (with the same configuration, addressing, and programming).
Through the integrated PROFIBUS DP interface, distributed I/O with fail safe I/O modules can be connected. The ET 200M fault-tolerant I/O module can also be installed in a secure central configuration. Implement secure communication between F-CPU and fault-tolerant I/O modules based on PROFIsafe specifications.

4、 Safety Instrumented System SIS Module CPU315f-2dp Function

1. Password protection:
By using a password, the user program can be protected from unauthorized access.

2. Diagnostic buffer:
The last 500 error and interrupt events are saved in a buffer for diagnostic purposes.

3. Maintenance free data backup:
If a power outage occurs, all standard data can be automatically written to the SIMATIC micro memory card through the CPU and will remain unchanged when powered on again.

5、 Parameterized features of safety instrumented system SIS module CPU315F-2dP

1. You can use STEP 7 to set parameters for the configuration, properties, and CPU response of S7:

MPI multi-point interface;
Determine the station address

Restart/cycle time characteristics;
Maximum cycle time and load limit, as well as self detection function

Clock bit memory;
Set address

Protection level;
Set access permissions for programs and data

System diagnosis;
Define the processing and scope of diagnostic alarms

Monitor interrupt;
Set cycle time

Clock interruption;
Set the start date, start time, and interval period.

PROFIBUS DP master/slave interface;
User defined address allocation for distributed I/O information and display functions

Status and fault indication:
LED indicates hardware, programming, time or I/O faults, and operational status (such as RUN, STOP, and boot).

2. Testing function:
Using a programmer to display the signal status during program execution, process variables can be modified and stack contents can be output without the need for user programming.

3. Information function:

Provide users with storage capacity information, CPU operating mode, current usage of main memory and load memory, current cycle time, and diagnostic buffer content in text form through a programmer.

4. Integrated communication function:

Programmer/OP communication;

Global data communication;

S7 basic communication;

S7 communication (server only);

route;

Data record routing.

6、 Safety Instrumented System SIS Module CPU315F-2dP Communication

Perform secure and standard communication between the central controller and distributed stations through PROFIBUS DP. The specially developed PROFIBUS line standard PROFIsafe supports the transmission of user data with security functions in standard data message frames. No other hardware components are required, such as a special safety bus. The required software can be integrated into hardware components as an extension of the operating system, or loaded into the CPU as a software block.

1. System functions

The CPU provides various system functions for diagnosis, parameter setting, synchronization, alarm, time measurement, etc.
For more details, please refer to the manual.

2. Operation mode

The safety function of F-CPU is included in the F program of CPU and the fault safety signal module.

The signal module uses differential analysis methods and test signal injection techniques to monitor input and output signals.

The CPU checks the correctness of the controller's operation through periodic self checks, command testing, and logic and time-based program execution checks. In addition, I/O can also be detected through "sign of life" requests.

When the system diagnoses a fault, it will enter a safe state.

Operation S7-300F-2 DP does not require authorization from the F operating version.

3. Programming

The programming method for CPU 315F-2 DP is the same as that for SIMATIC S7 system. Non secure user programs can be created using programming tools such as STEP 7.

4. Option package SIMATIC S7 Distributed Safety (Classic) and SIMATIC Safety Advanced V12 (TIA Portal V12)

The STEP 7 option package "SIMATIC S7 Distributed Safety" (Classic) or SIMATIC Safety Advanced V12 (TIA Portal V12) is used for programming safety program segments. The option package includes all the functions and blocks used to create the F program.

5. F programs with safety features can be created using F-FBD or F-LAD methods, or by utilizing special function blocks in the F library. The use of F FBD or F LAD can simplify the configuration and programming of factories, as well as simplify acceptance testing due to a unified representation format that is independent of specific factories. Programmers can configure secure applications without the need for other tools.