Ncu-Link; Response Of The Sim-Nck Systems - Siemens SINUMERIK 840D sl Function Manual

12.8

NCU-Link

An NCU link involves a group of several NCUs to control a machine. In this case, the
interpolation function of the various SERVO axes is distributed across the various NCUs.
The following definitions apply when operating systems such as these with safety functionality:
● An SPL must be applied on each NCU.
● An SPL is used to evaluate the local PROFIsafe I/O and the control of the local SERVO
axes. The monitoring behavior of SERVO axes of other NCUs is controlled by the SPL of
the corresponding NCU.
● Safety-related statuses are exchanged between various SPLs via the safety-related
communication F_SENDDP/F_RECVDP.
● Errors in the SPL context (SPL CDC) or F-communication context (PROFIsafe, F_SENDDP/
F_RECVDP) only act on the local SERVO axes.
● Errors from motion monitoring functions with stop responses on the IPO act on the axes of
the channel of the axis, which initiated this response. These responses can also affect other
NCUs.
● In conjunction with NCU Link, safety functions "Safe limit switch", "Safe cams" and "Safe
cam track" are not released.
12.9

Response of the Sim-NCK systems

For simulation systems, a distinction is made in systems, which can be used to verify
● that a part program can be executed
● the ability of the control to function - including the various I/O circuits
Simulation to check that the part program can be executed
It is not expected that the safety functionality is effective for these systems (Linux-based,
Windows-based without PLC simulation). The machine data, with which safety functionality
can be activated, are therefore write protected.
The following machine data are write protected:
● $MN_PROFISAFE_MASTER_ADDRESS
Enable PROFIsafe master functionality
● $MN_PROFISAFE_IN_ADDRESS
Enable PROFIsafe input modules
● $MN_PROFISAFE_OUT_ADDRESS
Enable PROFIsafe output modules
● $MN_PROFISAFE_IN_ENABLE_MASK
Enable PROFIsafe input modules
● $MN_PROFISAFE_OUT_ENABLE_MASK
Enable PROFIsafe output modules
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Interaction with other functions
12.9 Response of the Sim-NCK systems
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