- Password protection;
a password concept protects the user program from unauthorized access.
- Diagnostics buffer;
the last 500 error and interrupt events are stored in a buffer for diagnostic purposes.
- Maintenance-free data backup;
the CPU automatically saves all data (up to 128 KB) in case of a power failure so that the data are available again unchanged when the power returns.
Parameterizable properties
The S7 configuration as well as the properties and response of the CPUs can be parameterized using STEP 7:
- MPI multi-point interface;
determining station addresses
- Startup;
defining the startup characteristics of the CPU
- Synchronous cycle interrupts;
setting of DP master system, process image partition number, and delay time
- Cycle/clock memory;
specifying maximum cycle time and loading. Setting the clock memory address
- Retentivity;
setting of retentive areas
- 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
- Clock;
setting the type of synchronization in the AS or on the MPI
- Protection level;
specifying the access rights to program and data
- Communication;
reservation of connection resources
- Web;
settings for the Web server of the CPU
- PROFIBUS DP master/slave interface;
User-oriented address allocation for distributed I/O.
- PROFINET interface;
parameterization of time synchronization using NTP procedure
Display and information functions
- Status and error indications;
LEDs indicate hardware, programming, time, I/O and bus errors, and operating statuses such as RUN, STOP and start-up.
- Test functions;
the PG is used to indicate signal status during program execution, to modify process variables independently of the user program and to output the contents of stack memories.
- Information functions;
the PG can be used to obtain information about the memory capacity and operating mode of the CPU, the current loading of the work and load memory, current cycle times and diagnostics buffer content in plain text.
Integrated communication functions
- PG/OP communication
- Global data communication
- S7 basic communication
- S7 communication
- S5-compatible communication
- Routing
- Data record routing
- PROFIBUS DP master/slave
- Open communication over TCP/IP, ISO-on-TCP and UDP
- PROFINET IO controller
- PROFINET CBA
- Web server
System functions
The CPU provides many extensive system functions for diagnostics, parameterization, synchronization, alerting, time measurement, etc.
For detailed information, refer to the manual.