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Programming
The user program executed on the CPU module is configured on a PC using
STEP7/HWConfig and CFC and then downloaded to program memory.
The program memory must be located in the CPU module slot provided.
There are two ways of loading the user program:
● Offline loading
● Online download
User program size
The size of the user program (compressed to approx. 50 %) that was downloaded to
program memory and the size of free program memory can be viewed in the CFC by
selecting the following menu command:
● PLC / Load / Info
Utilization
Average load (measured with block PSL) should not exceed 95 %, since this may lead to
sporadic overload.
Program memory
The user program created in CFC is downloaded to program memory. Program memory is
realized with Flash EPROM (2, 4 or 8 MB) and 8 KB EEPROM cache memory.
The following program memory may be used optionally, depending on the size of the user
program:
● MC500 (4 MB)
● MC510 (8 MB)
● MC521 (2 MB)
Software security
The module provides a socket for a hardware block for implementation of a software security
function for the user program.
This hardware block can be checked using a special function block.
● Additional information on request.
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
Carried out on the PC using an integrated or external PCMCIA programming adapter
("PC card").
Direct user program download from the PC to program memory in the CPU module via
serial service interface.
CPU modules
3.1 CPU module CPU550/CPU551
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