Sensor systems 2 AS-Interface

Masters and
Gateways
Power Supplies,
Extender, Repeaters
Safety at work
I/O Modules
Control cabinet
I/O Modules
Field application
Analogue modules
Other modules
Inductive sensors
Photoelectric
sensors
Rotary encoders
Accessories
AS-Interface - Introduction
24
AS-Interface
CTRL
for primary control
(RS 232,RS 422,RS 485)
F
AS-Interface
CTRL
Host
AS-Interface
EV
EV
Gateway
AS-Interface
CTRL
Fieldbus
2.1 Master
Masters with RS 232 serial interfaces are frequently used as point-to-point
connections for local solutions where a short distance to the control node is
involved (Typically up to 10 m). Since these masters also contain a control
function with SPS functionality (Typically 16 kB program memory, 8 kB user
memory, 1024 timer and 1024 counter), they are frequently used as autonomous
control units for sub areas. The program processing time is approximately
1000 instructions every 2 ms.
The programming language is based on STEP5 ® . After commissioning the
connection between the PC and the master is broken and the application
operates independently. This master is available for installation in the control
cabinet in the construction types KF (Removable terminals, power rail
connection) and K5 (Screw terminal connection) or as a plug-in card for the
PC (for instance VAM-CTR-PC2). If PC masters are used, then the structure
is similar to the structure for AS-Interface masters, except that the master
is integrated in the PCI slot of the PC.
Dual masters are also available: in these, two independent masters are located
in a single housing.
2.2 Gateways
The gateway places the data at the disposal of the higher-level field bus
(PROFIBUS, INTERBUS, DeviceNet, EtherNet, Modbus, Modbus+, CAN,
CC-Link, ...), in the requisite format. If devices with control functionality are
used (see selection table), a preprocessing of AS-Interface data can be performed,
just as with masters, so that sensors and actuators on the same
AS-Interface network can be directly connected with one another via the
control functionality. This makes it necessary to transmit only a little data for
display in the higher-level bus system. This reduces the system load on the
higher level bus system and hence increases performance. The preprocessing
also reduces the memory requirement and the processing time,
which in turn decreases the cycle time.
Here, too, there are gateways available for the switch cabinet (KF, K20, or
K5) and for field application (G4).
2.3 Programming with AS-i Control Tools
This software is based on Windows (95, 98, ME, NT4, 2000, XP). After a
serial connection has been prepared for the master an easy to follow configuration
assistant guides you through all the further steps required and
provides help text support. The AS-Interface network is displayed graphically.
A fault elimination routine helps in the event of nonsensical results. The
finished configuration can be saved as a file and sent via download to the
master/gateway. This means that in series production similar configurations
can be easily prepared and the configuration can be printed out for the purpose
of system documentation.
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group Tel.: Germany +49 621 776-0 USA +1 330 4253555 Singapore +65 67799091 Internet http://www.pepperl-fuchs.com
Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005