Siemens SINUMERIK 840D sl Commissioning Manual page 138

Expanding the Operator Interface (BE1)
5 Configuring OP Hotkeys and PLC Keys
Display deselection
1. The PLC sets bit1 for display deselection in the PLC byte if bit1 and bit2 are set
in the HMI byte and bit7 is reset.
2. HMI Embedded/HT6 acknowledges to the PLC that it has accepted the display
deselection by setting bit0 in the HMI byte. At the same time, the value zero is
written to bit3 and bit4 in the HMI byte.
3. HMI Embedded/HT6 acknowledges the display deselection to the PLC by
setting bit3 and resetting bit0, bit1 and bit2 in the HMI byte if the interpreter is
terminated.
4. The PLC resets bit1 in the PLC byte.
After display deselection by the PLC or the EXIT command, HMI Embedded/HT6
switches back to the last selected HMI display.
Error when selecting a display
Bit4 is set in the HMI byte if the interpreter has not responded after 20 seconds or if
the required display cannot be opened.
The PLC states of the HMI, which do not support PLC display selection are shown
via bit7 in the HMI byte; e.g., in HMI Embedded during switchover between
standard and ShopMill interface.
Operating areas
With HMI Advanced, the displays are shown in a separate operating area similar
to the measuring cycle displays. This operating area can be selected manually by
means of the sixth softkey (PLC displays) on the second operating area menu. If
no PLC display is active when the area is selected, the text "Currently no PLC
display active" is displayed in the header. The PLC is informed when the area is
selected/deselected manually via bit2 of the HMI byte.
It is also possible to change to other operating areas via the MMC 103's operating
area after a display has been selected by the PLC.
With HMI Embedded/HT6, it is not possible to manually select/deselect displays
selected by the PLC via an operating area. The PLC display remains in the
foreground even after operating area change has occurred.
Configuring PLC displays
The interface is activated by means of the section [PLC_SELECT] in the
Common.com file during HMI boot. HMI Embedded/HT6 searches the directories
for the Common.com file in the following sequence:
• User cycles directory
• Standard cycles directory
• Comment directory
The first file found is evaluated.
Display numbers are assigned to the configured displays in the Common.com file
in the section [PLC_SELECT].
BE1/5-132
SINUMERIK 840D sl/840D/840Di/810D HMI Installation and Start-Up Guide (IAM) – 08/2005 Edition
(CUS)
(CST)
(COM)
© Siemens AG, 2005. All rights reserved
08/2005