CPU modules
4.2 CPU module CPU550/CPU551
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
89
Operation with CP51M1
Note
CPU551 with CP51M1
To operate the CPU module CPU551 (6DD1600-0BA3) with the communications module
CP51M1, use only a communications module CP51M1 with a functional status > 7.
Substitute value behavior
Note
Floating decimal calculation
Please note that if you have selected the option "Use substitute values for invalid Real
values" that the calculation with invalid Real values (NaN) can return different results with
versions 6DD1600-0BA1 and 6DD1600-0BA2 of CPU module CPU551.
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