Expanding the Operator Interface (BE1) 08/2005
5 Configuring OP Hotkeys and PLC Keys
© Siemens AG, 2005. All rights reserved
BE1/5-130 SINUMERIK 840D sl/840D/840Di/810D HMI Installation and Start-Up Guide (IAM) – 08/2005 Edition
5.3.3 Display selection from the PLC
There is an interface between the PLC and HMI Embedded/HT6 for selecting the
displays. These PLC displays offer the same means of display and functions as for
the displays selected via the softkeys.
Rough description of the interface
The interface contains:
• The display number
• Control bits from PLC to HMI
• Control bits from HMI to PLC
As each NCU can be addressed by up to two HMI Embeddeds/HT6s at the same
time in systems with "several operator panel fronts and NCUs", this interface can
exist in duplicate.
References: /FB/, B3 "Several Operator Panels and NCUs"
The interface is located in the operator panel front interface (DB19). The interface
requires a total of 8 bytes in DB19, 4 bytes for each HMI Embedded/HT6.
Location and structure of the interface
The interface between HMI Embedded/HT6 and the PLC uses the following data:
HMI1:
DB19.DBW28: Display number
DB19.DBB30: PLC control bits  HMI, PLC byte
DB19.DBB31: Control bits HMI  PLC, HMI byte
HMI2:
DB19.DBW28: Display number
DB19.DBB80: PLC control bits  HMI, PLC byte
DB19.DBB81: Control bits HMI  PLC, HMI byte
PLC byte:
Bit0 Display selection
Bit1 Deselect screen
HMI byte:
Bit0 Display selection/deselection accepted
Bit1 Display is selected/deselected
Bit2 Display is selected
Bit3 Display is deselected
Bit4 Error, display selection not possible
Bit7 Inactive bit
Two bytes are used for the display number to be transferred by the PLC, one byte
respectively (PLC byte and HMI byte) for coordinating the display selection.
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