08/2005 Expanding the Operator Interface (BE1)
5 Configuring OP Hotkeys and PLC Keys
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D HMI Installation and Start-Up Guide (IAM) – 08/2005 Edition
BE1/5-131
Using the interface
Table 5-1 DB 19 extract, first HMI interface
PLC 
HMI
Selec-
tion
Dese-
lection
HMI  PLC Selection Dese-
lection
DBW
28
Display number (1)
Bit DBB 30 DBB 31
0 Display
selection
1 (2)
0 (4)
Select/dese-
lect accepted
1 (3)
0 (6)
1 (2)
0 (3)
1 Deselect
screen
1 (1)
0 (4)
Display is
being
selected
" "
deselected
0 (3)
1 (5)
0 (3)
2 Display is
selected
0 (3)
1 (7)
0 (3)
3 Display is
deselected
0 (3) 0 (2)
1 (3)
4 Error, display
selection not
possible
0 0 (2)
5 -
6 -
7 Inactive 0
The interface is operated by the PLC OEM program with the following functions:
Display selection
The relations with the individual steps are shown in the above table by the numbers
in brackets (step numbers).
1. The PLC enters the display number in the number word.
2. The PLC sets bit0 in the PLC byte for display selection if bit0 and bit7 are set to
zero in the HMI byte.
3. HMI Embedded/HT6 acknowledges to the PLC that it has accepted the display
selection by setting bit0 in the HMI byte. At the same time, the value zero is
written to bit3 and bit4 in the HMI byte.
4. The PLC resets bit0 in the PLC byte.
5. HMI Embedded/HT6 acknowledges to the PLC that the interpreter has started
by setting bit1 in the HMI byte.
6. The HMI resets bit0 in the HMI Embedded/HT6 byte.
7. Bit2 is set in the HMI byte if the corresponding display appears.
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