User's Manual

Siemens PLT 130
.
1994
4/5
Interface module for 20-m local bus (N-V.24)
Description
1 LED F (red), signals faults (line protocol faulty, receiver memory overflow)
2 LEDs (green)
D signals ”Data transfer on bus”
M signals ”Interface module has master function”
T signals ”Bus processor busy”
B indicates setting of interface module on bus B
A indicates setting of interface 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 local bus (N--V.24)
Application
For connection of non-Siemens computers to the CS 275 bus
system via a V.24 or 20-mA current loop interface.
The external computer must have a V.24 or 20-mA current loop
interface. Coupling software is required in the external computer
to handle communication with the interface module N-V.24.
The data transmission rate can be adapted to the requirements
between 110 bit/s and 9600 bit/s; for example, 120 measured
values/s can be transmitted at a data transfer rate of 9600 bit/s
via the serial interface.
The module handles duties specifically connected with data
transmission, including occasional control of data transfer.
Design
Compact subassembly , double height, with 1 base plug and
2 front plugs
Front panel width 30.48 mm = 2 standard slots.
The N-V.24 interface module is plugged into an I/O slot. It does
not receive its supply voltage 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 modules N-V.24 is therefore
restricted.
Possible plug-in slots:
Slot for I/O module
In the AS 235 automation system (max. 2 modules N-V.24 per
system (basic unit or extension unit)
In the AS 235 K automation system (max. 2 modules N-V.24
per system (basic unit)
In the AS 235 H automation system (max. 1 module N-V.24
per extension unit with 5-V module.)
Use of the N-V.24 interface module in the ES 100 K extension
system or in the AS 215 automation system is not allowed.
Interfaces for non-Siemens
computer
(alternatively at front plug X3)
V.24 interface
T x D Transmitted data
Information is sent to the peripheral device via this line
R x D Received data
Information is transferred to the system via this line
DSR Data set ready
Input for ”data set ready” message from data circuit
terminating equipment
CTS Clear to send
Input for ”clear to send” message 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 transmitter unit of the data
circuit terminating equipment
I1,I2 Internal constant-current sources
20-mA current loop interface
R x D Received data
+ 20 mA: input, -- 20 mA: output
T x D Transmitted data
+ 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-Siemens computer via the CS 275 bus system is carried out
using the same messages which are used for communication
between TELEPERM M systems. The defined types of order
(format, coding, acknowledgement mode) and the function of
the hardware interface (N-V.24) are described in the Instructions
for the interface module N-V.24 and in the Manual ”N-V.24, Cou-
pling of non-Siemens computers to the CS 275 Bus System”.
Coupling software must be installed in the external computer
which matches the computer to the communication conditions of
the N-V.24 interface.
Setting of addr
ess
In order to differentiate between the individual interface modules
in the autonomous bus system, each interface module must be
allocated a so-called participant address. In order to differenti-
ate between several autonomous buses connected via bus cou-
plers, each interface module must 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