Sensor systems 2 AS-Interface

AS-Interface - Introduction
14
conventional
AS-Interface
Flat cable
AS-Interface installation
If AS-Interface modules are used in the control cabinet or junction boxes,
connection via power rail is particularly advantageous.
Flat cable
When using AS-Interface in the field, the greatest advantages are realised
when flat cable is used. However, a 2-core, unscreened standard round cable
with 1.5 mm2 cross section (for example, H05VV-F2x1,5) can be used.
Due to the form of the flat cable, polarity reversal is impossible, and using
insulation penetration connection, slaves can be connected in seconds. For
this purpose, the flat cable is laid in two cable trays in the lower part of the
module and the upper part of the module is then positioned on it and
screwed down. This ensures both strain relief and also a secure contact via
two contact blades per core.
A 24 V auxiliary power supply is necessary only for very high-powered actuators,
and can be supplied via a black flat cable which is laid parallel to
the yellow AS-Interface flat cable.
Installation
The AS-Interface cable is symmetrical, that is, neither of the two cores may
be earthed. A branch can be made at any point (arbitrary topology), on the
end of which no termination resistor is necessary.
The total length of the AS-Interface network can be extended from 100 m
by an additional 100 m using repeaters.
Power supply is generally incorporated using the AS-Interface power at any
point in the AS-Interface network. For slaves with particularly large power
requirements, it makes sense to put the power supply nearby, to keep the
voltage drop low. An optional 24 V auxiliary power supply may be necessary
when using high-powered actuators, in order to be able to drive these via
the electronic outputs.
AS-Interface masters/gateways are supplied with 24 V directly or from the
AS-Interface.
Commissioning can be performed directly at the master/gateway using
function keys and the graphical display, a PC or PLC are not required.
The attachment of a new slave is "plug and play": Connection, "teach-in" on
the master, done. The addressing of the same type of slave is automatic after
an exchange. Slaves can be connected or disconnected while the network
is in use.
The connection of sensors and actuators to the interface module is completed
using plug connectors, screw terminals, or cage-clamp terminals. Inputs,
that is, sensors or mechanical contacts, can be supplied with power from
the AS-Interface.
Pepperl+Fuchs offers a wide variety of connection accessories for simple
installation (for instance, cable gland in M12 or terminals, screw adaptors
for housing installation) and of course various types of AS-Interface flat cable.
A tool for the quick stripping of flat cable is also available.
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