Page 869 - Sensors and Systems - North American Catalog
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AS-Interface
Introduction
Flat Cable Piercing Technology
In addition to being the fastest installation method, the AS-Interface flat
cable offers other benefits resulting in long-term performance and reliability.
Reliable piercing—electrical connections are established when the AS-
Interface flat cable attaches to a Pepperl+Fuchs I/O module. The reliability
of those connections has been proven time and again and has been
formally evaluated using the DIN EN-60068-2-64 standard.The self-sealing
property of the rubber insulation maintains dust and dirt protection once a
module is removed.
Shielding or No Shielding
In general, AS-Interface uses unshielded cable. If shielded cable is used, it
is important to connect the shield wire to a solid machine ground wherever
the data/power leads are exposed and at the power supply ground
connection. Essentially, shielding is used for mechanical protection, not
noise immunity. Because of the way AS-Interface is designed, the shield
may reduce the network length by as much as 20%.
AS-Interface uses a floating signal and derives much of its noise
resistance from it. Tying one lead to ground will interfere with AS-Interface
communications. Data transmission of AS-Interface requires no shielding,
no termination, and no twisted pairs.
Data Integrity and Noise Resistance
• Designed for tough industrial applications
• Noise resistant—performs in environments where other systems fail
Update Time
The maximum cycle time of a fully loaded network is 10 ms. If the segment
is not fully occupied, the cycle time reduces by 0.155 milliseconds per slave.
To calculate the total network update time, simply multiply the number of
modules by 150 microseconds. The cycle time is the same for I/O modules
with full or half addresses. Analog nodes, however, are exceptions as they
split the data up over several scans.
Approvals
All Pepperl+Fuchs AS-Interface devices are constructed to adhere to
national and international rules and regulations.
All Pepperl+Fuchs modules are CE approved and meet
the highest level for electronic noise immunity possible for
AS-Interface.
This symbol indicates products have been tested and
listed to Underwriters Laboratory standards and are in
compliance with both Canadian and U.S. requirements.
Safety modules with this approval can be used up to
category 4 according to EN954 and up to SIL3 according
to IEC 61508
AS‑Interface System Components
AS‑Interface products from Pepperl+Fuchs are certified by the independent
AS‑Interface testing body to ensure interoperability between products. This
is indicated by the AS‑Interface shadow logo on our products.
Gateways and scanners
Gateways are devices that form an interface between the AS-Interface and
higher-level buses. Pepperl+Fuchs offers gateways for all standard buses:
• PROFIBUS
• MODBUS
• EtherNet/IP
• PPROFINET
• CC-Link
• Modbus TCP
• DeviceNet
• CAN Bus
AS-Interface scanners are available from virtually every PLC/DCS
manufacturer, and are a great way to bring AS-Interface directly into the
backplane of your control system.
Power Supplies and Repeaters
Pepperl+Fuchs’ power supplies have power factor correction and high-
efficiency ratings. The wide input voltage range allows the power supplies
to be used all over the world. All are overload protected and require no
external fusing for proper operation. Fault recovery is automatic when the
short circuit is removed.
Repeaters extend AS-Interface cable length by 100 m. Since they
galvanically isolate the connected network segments, an AS-Interface
power supply must be located in both segments. As long as a signal
traveling from the scanner/gateway to a module does not cross more
than two repeaters, longer networks can be built. A linear network of 500
m is easily possible by placing the scanner/gateway in the middle section.
When using repeaters, I/O modules can be placed in any cable segment.
Regardless of the cable length and number of repeaters, a maximum of 62
modules per gateway can be placed on an AS-Interface network.
I/O modules
I/O modules are the essence of the AS-Interface system. All inputs and
outputs communicate with the scanner/gateway through the modules.They
drive the solenoids and relays, initiate valves, and enable pushbuttons.
Modules with different numbers of inputs and outputs are available for
control cabinets, junction boxes, or field applications.
LISTED
NOTE: Do not ground ANY of the AS-Interface
leads under ANY circumstances.
AS-Interface
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