User's Manual

Siemens PLT 111 · 1999
5/9
Input and output devices
Configuring unit
Mini floppy disk unit
Mini floppy disk unit
The mini floppy disk unit is required for booting, loading and
archiving the RAM contents of an AS 235 using floppy disks.
The mini floppy disk unit is a desktop unit with 3-m long connec-
tion cables for data transmission and power supply.
The data media are 5.25" floppy disks, double sided, high den-
sity (DS-HD).
Mode of operation
The drive interface of the mini floppy disk unit is matched to the
central processing unit by the interface module. The data are
exchanged sector by sector by direct memory access (DMA).
This ensures rapid data access and little loading on the central
processor.
Since the drive of the mini floppy disk unit is not equipped with
a head load function, the read/write head always rests on the
floppy disk when the drive is locked using the lever. To prevent
high wear and possible damage to the read/write head or the
floppy disk during permanent operation, the lever should either
be opened immediately following an archiving or loading proce-
dure, or the floppy disk should be removed.
Fig. 5/6 Mini floppy disk unit
Technical data
Ordering data Order No.
Data medium
Floppy disk; 5,25 inch
Data capacity
1.2 Mbytes
Data transfer rate
300 kbits/s
Power supply
DC 24 V (20 to 33 V);
approx. 0.52 A;
approx. 0,74 A during motor
startup for 400 ms
Permissible ambient temperature
– Operation
Storage
+10 to +40 °C
-20 to +65 °C
Permissible relative humidity
20 to 80 %, no condensation
Vibration resistance
– Operation
– Transport and storage
< 55 Hz, < 0.5 g
55 to 500 Hz, < 0.25 g
< 100 Hz, < 2 g
Dimensions (H x W x D) in mm
120 x 180 x 320
Weight
Approx. 3 kg
Mini floppy disk unit
with connection cables for data
transmission and power supply,
3 m each
6DS3 900-8AE
Floppy disks
for archiving user data
5.25" floppy disk, DS-HD,
IBM-compatible,
unformatted
Obtainable from computer
suppliers
e.g. MAXELL disk,
order no. 555081
obtainable from
MAXELL Europe GmbH
D-40670 Meerbusch
This catalog is out of date, see note on page 1