Siemens SIMATIC S5 Manual page 151

Starting COM247
Note
After switching off the PG, this setting is lost. The hardware clock can
only be set at the system level.
Significance of the function keys
With BEGIN, you branch to SELECT FUNCTION and providing ONLINE is set, the
<Fl >:
presets (module number, slot number, page address) are written to the module. These
values are, however, only accepted by the module when either no correct machine
data is stored on the module or the module number is identical to the module number
in the machine data (=> Section 4.3.18 "SYSID Input"),
This key switches from OFFLINE to ONLINE and vice- versa. If you switch to ONLINE,
<F2>:
the values on the module "module number", "slot number", "page number" and
"firmware release" are read (=> Section 4.3.19 "Read SYSID") and output in the
display. OFFLINE, these fields are deleted.
<F6>: Branch to the printer parameter display. Here, you can stipulate control character
sequences,
HELP key to select possible drives and file names contained in them.
With the EXIT key, you return to the configuration display.
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