Commissioning HMI Advanced (IM4) 08/2005
2 Setting Functions and Parameters
© Siemens AG, 2005. All rights reserved
IM4/2-24 SINUMERIK 840D sl/840D/840Di/810D Installation and Start-Up HMI (IAM) - 08/2005 Edition
Start DBBx
HMI detects a job and acknowledges it (all bytes=0).
Start DBWx+1
Start DBWx+1 contains the offset for a text number with a base of
700,000 (user PLC texts). If this parameter = 0, the corresponding line
is deleted.
Start DBBx+3
Start DBBx+3 contains a number that is displayed without being
converted.
Start DBBx+4
Start DBBx+4 contains an axis index.
• Negative value = machine axis index
(AXCONF_MACHAX_NAME_TAB[ Index-1], MD 10000),
• Positive value = channel axis index
(AXCONF_CHANAX_NAME_TAB[ Index-1], MD 20080),
These indices always refer to the channel currently displayed in the
HMI.
The index is converted to an axis name before being displayed.
Start DBB+5
Start DBBx +5 to +17 contains a character string comprising a
maximum of 12 characters.
Note
Bit 0=1 can only be set in Start DBBx for a new job if
• All bytes were reset to zero after the preceding job
• Parameters for the new job Start DBBx+1 to Start DBBx+5 have been set
correctly
• Special characters that have a special meaning within the syntax for this
function (", %, $, #) must not appear within the user's character string (Start
DBB+5…).
Structure of PLC program
The PLC program must be laid out in such a way that all parameters are initialized
before the first byte is set.
The data for the program name line (second line) are located 20 bytes after the
start byte.
Acknowledgement mechanism between HMI ↔ PLC
For the Start DBBx, there is an acknowledgment mechanism that ensures that the
HMI and PLC agree:
• The PLC sets Bit 0 to 1 "Display user text in header". The function request can
only be set by the PLC if Bit 0 has the value “0”.
• After displaying the text in the header, the HMI writes “0” again in Bit 0 and the
interface is enabled for the PLC for the next action.
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