Installation and connection
4.3 Connecting the HMI device
TP 270, OP 270, MP 270B (WinCC flexible)
Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0
4-15
Compressing the internal program memory with SIMATIC S5
Warning
In the case of the SIMATIC S5, compressing the PLC's internal program memory
("Compress" PU function, integrated FB COMPR) is not permitted if an HMI device is
connected. When memory is compressed, the absolute addresses of the blocks in the
program memory change. Since the HMI device only reads the address list during startup, it
does not recognize the address change and accesses the wrong memory areas.
If you cannot avoid compressing memory during operation, turn off the HMI device before
running the compress function.
4.3.6 Connecting the configuration computer
Connection configuration
The figure below illustrates how to connect a configuration computer (PU or PC) to the HMI
device for transferring project data.
Standard cables are available for the connections shown (refer to the ST80 catalog).
COM
IF2
PC/PU
RS 232
IF1 B
MPI/PROFIBUS DP
RS 485
PC/PU
RJ45
PC/PU
Ethernet
USB
USB
PC/PU
Operating unit
Figure 4-6 Connection configuration for configuration computer
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