SIEMENS SIMATIC S7-300 – 6ES7312-1AE14-0AB0
- The entry level CPU in Totally Integrated Automation (TIA)
- For smaller applications with moderate processing performance requirements
SIMATIC Micro Memory Card required for operation of CPU.
CPU 312, the smallest S7-300 CPU. This is ideally suited to simple applications in which the advantages of TIA such as integrated communication, data management and diagnostics can however be utilized. Networking is possible using MPI or by means of CPs, the standard mode of application is, however, non-networked operation. The I/O is normally connected in a centralized configuration.
The CPU 312 is equipped with the following:
the processor achieves a processing time of 100 ns per binary instruction.
- Extensive memory;
32 KB high-speed RAM (equals approx. 10 K instructions) for program components relevant to execution offers sufficient space for user programs;
SIMATIC Micro Memory Cards (max. 8 MB) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments).
- Flexible expansion capability
max. 8 modules (1-tier configuration)
- MPI multi-point interface
The integrated MPI interface can establish as many as 6 connections simultaneously to S7-300/400 or to programming device, PC, OP. One of these connections is always reserved for the PG and another one for the OP. The MPI makes it possible to set up a simple network with a maximum of 16 CPUs via “global data communication”.
- Password protection;
a password concept protects the user program from unauthorized access.
- Block encryption;
the functions (FCs) and function blocks (FBs) can be stored in the CPU in encrypted form by means of S7-Block Privacy to protect the know-how of the application.
- Diagnostics buffer;
the last 500 error and interrupt events are stored in a buffer for diagnostic purposes, of which 100 are stored retentively.
- Maintenance-free data backup;
retentive data is automatically backed up by the CPU if the voltage is interrupted and is available unchanged after the voltage has been reconnected.
The S7 configuration as well as the properties and response of the CPUs can be parameterized using STEP 7:
definition of the name, plant identifier and location ID. Parameter assignment of the multi-point interface MPI: Determining node addresses
definition of the startup characteristics of the CPU and the monitoring time
- Cycle/clock memory;
specification of the maximum cycle time and load. Setting of the clock memory address.
definition of the number of retentive bit memories, counters, timers and data blocks
- Clock interrupts;
setting of start date, start time and periodicity
- Watchdog interrupts;
setting of periodicity
- System diagnostics;
determining handling and scope of the diagnostic alarms
setting of the synchronization method in the AS or on the MP
- Protection level;
specifying the access rights to program and data
reservation of connection resources
Display and information functions
- Status and error indications;
LEDs indicate e.g. hardware, programming, time or I/O errors, as well as operating states such as RUN, STOP and start-up.
- Test functions;
the PG is used to indicate signal states during program execution, to modify process variables independently of the user program and to output the contents of stack memories.
- Information functions;
you can use the PG to obtain information about the storage capacity and operating mode of the CPU as well as the current loading of the main and load memories as well as current cycle times and diagnostic buffer contents in plain text.
Integrated communication functions
- PG/OP communication
- Global data communication
- S7 basic communication
- S7 communication (server only)
SIMATIC S7-300, CPU 312 Central processing unit with MPI, Integr. power supply 24 V DC, Work memory 32 KB, Micro Memory Card required
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