Siemens Barcode Reader SIMATIC S7-400 User Manual

Scanner
Barcode
reader

Process
controller

SIMOVERT
SIMOREG

Modem

PC Printer Robot

control

BDE
terminal

3rd party
PLC

G_ST70_XX_00687

SIMATIC S7

© Siemens AG 2011

Point-to-point connection

Point-to-point link via communications processors (CPs) is an
extremely powerful and low-cost alternative to bus systems.
The advantage of point-to-point links over bus systems is es­pecially pronounced when only a few (RS 485) devices are to
be connected to the SIMATIC S7.

The CPs can also easily link third-party systems to the
SIMATIC S7. Thanks to the great flexibility of the CPs, different
physical transmission media, transmission rates or even cus­tomized transmission protocols can be implemented.

The CPs have a rugged plastic housing with LEDs for displaying
operating states and faults.

For each CP there is a configuring package on CD with elec­tronic manual, parameterization screen forms and standard
function blocks for communication between the CPU and
the CP.

The configuration data are stored in a system block and

Point-to-point links for SIMATIC S7-400

backed up in the CPU. When modules are replaced, the new
module is therefore immediately ready for use.

With the S7-400 point-to-point link modules, adaptation to
the physical transmission media is achieved by plugging in the
relevant interface submodules, without the need for external
converters.

Technical data: Point-to-point connection
Application High-speed response

with low data volumes

Transmission rate High (115 200 bit/s) Low (38 400 bit/s) High (115 200 bit/s)
Loadable protocols

(Order No. group: 6ES7 340-)

Module CP 440 CP 441-1 CP 441-2

Order No. group: 6ES7 440-1. 441-1. 441-2.

Physical transmission media

RS 232C (V.24) All transmission methods, all interface modules,
20 mA (TTY)
RS 422/485 (X.27)

Integrated transmission protocols

ASCII
Printer driver
3964 (R)
RK 512

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(up to 32 nodes)

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Interconnection

Low-cost:

With one variable
interface

plug-in, serial

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High-speed:
With two variable inter­faces

MODBUS Master (-1AA.),
MODBUS Slave (-1AB.),
Data Highway (-1AE.)

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SIMATIC Modular Controllers 59