Siemens SINUMERIK 840D sl Function Manual page 222

Connecting sensors and actuators
8.4 Safety-related CPU-CPU communication (F_DP communication)
For the case that 16 SPL connections are parameterized, for each SPL connection, there is
only one SPL coupling available.
The following value range for system variables and machine data is obtained from this:
● System variable index: 1...n with n = 16
● Machine data index: 0...m with m = 15
Figure 8-25
Figure 8-26
Activation data
Every parameterizing data set can be separately activated using the enable screen form.
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Example of 1 SPL connection with 4 SPL couplings
Interface overview F_SENDDP
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated