CPU modules
4.2 CPU module CPU550/CPU551
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
99
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:
●
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.
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
Average load (measured with block PSL) should not exceed 95 %, since this may lead to
sporadic overload.
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)
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