Siemens SINUMERIK 840D sl Operating Manual page 645

The combination of the settings in the HMI and in the PLC show the valid status as to
whether access is permitted or not. This is displayed in the "Resulting from" line.
Settings for the confirmation dialog box
If the settings made for "Specified from the PLC" and "Selected in the HMI" permit access
from outside, then this is however, still dependent on either a manual or automatic
confirmation.
As soon as a remote access is permitted, at all of the active operating stations, a query
dialog box is displayed for the operator at the active operating station to either confirm or
reject an access.
For the case that there is no local operation, then the control behavior can be set for this
particular scenario. You define how long this window is displayed and whether, after the
confirmation has expired, the remote access is automatically rejected or accepted.
Display of the state
If remote access is active, using these icons you will be informed in the status line as to
whether a remote access is presently active or whether only monitoring is permitted.
Procedure
Milling
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Remote monitoring active
Remote control active
1. Select the "Diagnostics" operating area.
2. Press the "Remote diag." softkey.
The "Remote diagnostics (RCS)" window is opened.
3. Press the "Change" softkey.
The "Selected in the HMI" is activated.
4. If you desire remote control, select the entry "Permit remote control".
In order that remote control is possible, the entry "Permit remote
control" must be specified in the fields "Specified from the PLC" and
"Selected in the HMI".
Alarm, error, and system messages
13.9 Remote diagnostics
645