Siemens SINUMERIK 840D sl Function Manual page 1187

// Auxiliary-function change signals are now scanned, etc.
END_FUNCTION
2.12.18 FC 13: BHGDisp display control for handheld unit
Description of Functions
This module carries out the display control of the handheld unit (HHU). The information to be
output on the display is stored as 32 characters in string data ChrArray. A fixed text
assignment of 32 characters is therefore required for this string when the data block is
created. Variable components within this string can be inserted by means of the optional
numerical converter, For the numeric converter the parameter "Convert" must be set to
TRUE. The variable to be displayed is referenced via the pointer Addr. The Parameter
"DataType" contains the format description of this parameter (see parameter table). The
number of bytes of the variable is linked to the format description. The address justified to
the right within the string is specified by parameter "StringAddr". The number of written
characters is shown in the parameter table. By setting parameter Row to 0, it is possible to
suppress the display (e.g., if several variables in one or several PLC cycles need to be
entered in the string without any display output).
Signals
Byte 1 is supplied by the output signals of the HHU and the character specifications are
supplied by the module. These may not be written by the PLC user program.
Additional parameters
The pointer parameters for the input and output data of the handheld unit must be
parameterized in the start OB 100 in FB 1, DB 7. Parameter BHGIn corresponds to the input
data of the PLC from the handheld unit (data received by PLC). Parameter BHGOut
corresponds to the output data of the PLC to the handheld unit (data transmitted by PLC).
These two pointers must be set to the starting point of the relevant data area, which is also
parameterized in SDB210 with an MPI link.
Note
If the numerical converter is used to display information, then it is better to avoid performing
a conversion in every PLC cycle for the sake of reducing the PLC cycle time. In this case, it
is advisable to use the input signal from the HHU to the PLC "Acknowledgment digital
display" (DB m+5.7) for parameter "Convert".
In this way it can be ensured that the most recent numerical information is displayed.
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
BE;
Detailed description
2.12 Block descriptions
203