Siemens SINUMERIK 840D sl Commissioning Manual page 384

Service and diagnostics
18.13 Remote diagnostics
Figure 18-4 System with several NCUs, several PCUs and a fixed modem
The "MC Information System RCS Host" option only has to be set for the NCU to which the
TS Adapter is connected at the X127 interface. Modem access can only be permitted by
making the appropriate entries at the SINUMERIK Operate on the PCU that is assigned to
this NCU and the "Request remote control" function executed. If modem access is permitted,
then the service PC implicitly has access via the plant or system network to all other NCUs
and PCUs and their operating software. The operating screens to control the remote access
can be individually used and set at each station (SINUMERIK Operate in the NCU) for the
station in conjunction with the relevant local PLC.
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Commissioning Manual, 03/2013, 6FC5397-1DP40-3BA1
SINUMERIK Operate (IM9)