© Siemens AG 2011
Point-to-point connection
Scanner
Barcode
reader
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 es-
pecially pronounced when only a few (RS 485) devices are to
be connected to the SIMATIC S7.
Process
controller
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 cus-
tomized transmission protocols can be implemented.
SIMOVERT
SIMOREG
Modem
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 elec-
tronic manual, parameterization screen forms and standard
function blocks for communication between the CPU and
the CP.
PC
Printer
Robot
control
BDE
terminal
3rd party
PLC
The configuration data are stored in a system block and
backed up in the CPU. When modules are replaced, the new
module is therefore immediately ready for use.
Point-to-point links for SIMATIC S7-400
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
Interconnection
with low data volumes
Low-cost:
High-speed:
With one variable
interface
With two variable inter-
faces
Transmission rate
High (115 200 bit/s)
Low (38 400 bit/s)
High (115 200 bit/s)
Loadable protocols
(Order No. group: 6ES7 340-)
MODBUS Master (-1AA.),
MODBUS Slave (-1AB.),
Data Highway (-1AE.)
Module
CP 440
CP 441-1
CP 441-2
Order No. group: 6ES7
Physical transmission media
RS 232C (V.24)
20 mA (TTY)
440-1.
441-1.
441-2.
All transmission methods, all interface modules,
plug-in, serial
RS 422/485 (X.27)
Integrated transmission protocols
ASCII
●
●
●
(up to 32 nodes)
●
Printer driver
3964 (R)
●
RK 512
SIMATIC Modular Controllers
59
|