Siemens SINUMERIK 840D sl Commissioning Manual page 137

08/2005
Using the interface
Table 5-1
DBW
28
Bit
0
1
2
3
4
5
6
7
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.
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D HMI Installation and Start-Up Guide (IAM) – 08/2005 Edition
DB 19 extract, first HMI interface
PLC Selec-
HMI tion
Display number (1)
DBB 30
Display 1 (2)
selection
0 (4)
Deselect
screen
Expanding the Operator Interface (BE1)
5 Configuring OP Hotkeys and PLC Keys
Dese- HMI PLC
lection
DBB 31
Select/dese-
lect accepted
1 (1) Display is
being
0 (4)
selected
" "
deselected
Display is
selected
Display is
deselected
Error, display
selection not
possible
-
-
Inactive
Selection Dese-
lection
1 (3) 1 (2)
0 (6)
0 (3)
0 (3) 0 (3)
1 (5)
0 (3) 0 (3)
1 (7)
0 (3) 0 (2)
1 (3)
0 0 (2)
0
BE1/5-131