Siemens SINUMERIK 840DE sl Commissioning Manual page 899

The lines for configuring the hardkey events have the following structure:
KEYx.n = area:=area, dialog:=dialog, screen:=screen, forms:=form,
menus:=menu, action:=menu.action, cmdline:=cmdline
KEYx.n = area:=area, dialog:=dialog, cmdline:=cmdline,
action:= action
x: Number of the hardkey, range of values: 1 – 254
n: Event number – corresponds to the nth actuation of the hardkey, range of values: 0 – 9
Requirement
The PLC user program must fulfill the following requirement:
Only one hardkey is processed. As a consequence, a new request can only be set if the
operating software has acknowledged the previous request. If the PLC user program derives
the hardkey from an MCP key, it must provide sufficient buffer storage of the key(s) to ensure
that no fast keystrokes are lost.
PLC interface
An area to select a hardkey is provided in the PLC interface. The area is in DB19.DBB10.
Here, the PLC can directly specify a key value of between 50 and 254.
Acknowledgment by the operating software takes place in two steps. This procedure is
necessary so that the operating software can correctly identify two separate events if the same
key code is entered twice consecutively. In the first step, control information 255 is written to
byte DB19.DBB10. This defined virtual key stroke enables the HMI to identify every PLC key
sequence uniquely. The control information is of no significance to the PLC user program and
must not be changed. In the second step, the actual acknowledgment takes place with respect
to the PLC by clearing DB19.DBB10. From this point in time, the PLC user program can specify
a new hardkey. In parallel, the actual hardkey request is processed in the operating software.
Example
Configuration file:
; configuration of OP hardkeys (KEY1-KEY9) and
; PLC hardkeys (KEY50-KEY254)
[keyconfiguration]
; MACHINE key (hardkey block)
KEY1.0 = area:=AreaMachine, dialog:=SlMachine
; PROGRAM key (hardkey block)
KEY2.0 = area:=AreaProgramEdit
; OFFSET key (hardkey block)
KEY3.0 = area:=AreaParameter
; PROGRAM MANAGER key (hardkey block)
KEY4.0 = area:=AreaProgramManager
; ALARM key (hardkey block)
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Programming Manual, 12/2017, 6FC5397-1DP40-6BA1
Generating commissioning dialogs
2.3 Dialog selection via PLC hardkeys
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