The keyboard is the collection of keys which are used to input data, text,
characters, letters, numbers, special characters and control commands in a
computer. The keyboard forms the input interface between the user and the
Liquid Crystal Display
Light-emitting diode (for display and indicating purposes).
The LPT port (Centronics port) is a parallel interface that can be used to connect a
LS 120 drive
The LS 120 drive is compatible with previous 3.5"-disk drives. With the LS 120
drive, normal floppy disks (1.44Mbyte) as well as Superdisks with up to 120 Mbyte
capacity can be used.
The main memory is the complete RAM memory of a PG or PC.
Memory cards are memory for user programs and parameters in credit-card for-
mat, for example, for programmable modules and CPs.
Micro Memory Card (MMC)
Very compact card for SIMATIC.
SIMATIC Box PC 840 Manual