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6GT2 097-3AH00-0DA2
2.4
Hardware planning
2.4.1
System configuration
The SLG read/write device can be connected to
either the X1 backplane connector or the 9-way
subminiature D connector X2.
SIEMENS
SLG
read/write
device
SIEMENS
SLG
read/write
device
PLC, PC
or
computer
interface
Two standard configurations
are available
– rack with 4 slots
– rack with 8 slots.
Subject to change without notice!
RD: 03/02
J31069-D0142-U001-A0-7618
Serial
interface*
serial
ASM 421 Technical Description
Computer/PC
Select
Request
DO
DI
one select line
one request line
for each
for each
ASM 421
ASM 421
6GT2 002-0DA00
– 10 –
6GT2 002-0DB00
6GT2 002-0DC00
Please note:
The Select and Re-
quest lines may be
omitted if only one
ASM 421 is being
driven from a serial in-
terface. The external
wiring of unnecessary
signals can also be
omitted.
* Daisy-chain confi-
gurations
are only
possible
with
the
RS422 and TTY inter-
faces.
ASM 421 / V.24
ASM 421 / RS422
ASM 421 / TTY
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