Siemens PLT130
.
1994
4/5
Interface module for 20-m local bus (N-V.24)Description
1 LED F (red), signals faults (line protocolfaulty, receiver memory overflow)
2 LEDs (green)
D signals ”Data trans fer on bus”
M signals ”Interface module has master function”
T signals ”Bus processor busy”
B indicatessetting of inter face module on bus B
A indicatessetting of inter face module on bus A
3 Reset key RS
4 Front plug X3 for connection of a non-Siemens computer via V.24
or 20-mA current loop interface
5 Front plug X4 for connection to the 20-m local bus
6 Jumpers for function and address settings
Fig.4/4 Interface module for 20--m localb us (N--V.24)
Application
For connection of non-Siemens computers to the CS 275 bus
systemvia a V.24 or 20-mAcurrent loop interface.
The external computer must hav e a V.24or 20-mA current loop
interface. Coupling soft ware is required in the external computer
to handle communication with the inter face module N-V.24.
The data transmission rate can be adapt ed to the requirements
between 110 bit/s and 9600 bit/s; f or example, 120 measured
values/s can be transmit ted at a data transfer rate of 9600 bit/ s
via the serial inter face.
The module handles duties specifical ly connected with data
transmission, includi ngoccas ional control of data transfer.
Design
Compact subassembly, double height, with 1 bas e plug and
2 front plugs
Front panel width 30.48 mm = 2 standard slots .
The N-V.24inter face module is plugged into an I/O sl ot. It does
not receive its supply vol tage via L+ (DC 24 V) but via the sup-
ply voltage +5 V of the I/O bus for the logic. The logic supply
voltage +5 V is loaded with 2.4 A per N -V.24 module thereby.
The number of useable interface modul es N-V.24is t herefore
restricted.
Possibleplug-in slots:
Slot for I/O module
In theAS 235 automation system (max. 2 modulesN-V.24per
system (basicunit or extension unit)
In theAS 235 K automation system (max. 2 modulesN-V.24
persystem (basic unit)
In theAS 235 H automation system (max. 1 moduleN-V.24
per extension unit with 5-V modul e.)
Use of the N-V.24 interface module in the ES 100 K extens ion
systemor in the AS 215 automationsystem is not allowed.
Interfaces for non-Siemens computer
(alternatively at front plug X3)
V.24inter face
T x D Transmitted dat a
Information is sent to the peripheral device vi a this line
R x D Received data
Informationis transferred to the system via this line
DSR Data set ready
Input for ”data set ready” mes sage from data circuit
terminating equipment
CTS Clear to send
Input for ”clear to send” mes sage from data circuit ter-
minating equipment
DTR Data terminal ready
Output for operating status message of N-V.24 module
RTS Request to send
Output signal, switches the transm itter unit of the data
circuit terminating equipment
I1,I2 Internal constant-cur rent sources
20-mA current loop interface
R x D Received data
+ 20 mA: input, -- 20 mA: output
T x D Transmitted dat a
+ 20 mA: input, -- 20 mA: output
Mode of operation
Communication between TELEPERM M systems and
non-Siemens computers
Data transfer between TELEPERM M systems and a
non-Siemenscomputer via the CS275 bus system is carried out
using the same messages which are us ed for communication
between TELEPERM M systems. Thedefined types of order
(format, coding, acknowledgement mode) and the functi onof
the hardware interface (N-V.24) are described in the I nstructions
for the interface module N -V.24and in the Manual ”N -V.24,Cou-
pling of non-Siemens computers to t he CS 275 Bus System”.
Coupling software must be instal led in the external computer
which matches the computer to the communicat ion conditions of
the N-V.24i nterface.
Setting of address
In order to differentiate between the indiv idual interface modules
in the autonomous bus system, each interface module mus t be
allocated a so-called parti cipant address. In order to differenti-
ate between several autonomous buses connected via bus cou-
plers, each interface module mus t be allocated a bus address.
These two addresses are set using plug -in jumpers on the front
panel of the interface module.
Created with "Chameleon CMYK PDF Creator" for Wolfgang Strozyk at Siemens AG
This catalog is out of date, see note on page 2