Pepperl+Fuchs Podcasts

Categories

AS-Interface Technology

Archives

2015
August
July
June
May
April
March
February
January

2014
December
November
October
September
August
July
June
May
April
March
February
January

2013
December
November
October
September
August
July
June
May
April
March
February

2012
December

August 2015
S M T W T F S
     
            1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31

Syndication

AS-Interface is used to simplify sensor wiring by replacing many discrete (parallel) sensor cables with a single AS-Interface network cable. AS-Interface is easy! Just don't do the following:

  • --Don't connect regular PNP or NPN sensors to the AS-Interface cable
  • --Don't connect a device with AS-Interface functionality to an AS-Interface I/O block (for PNP sensors)
  • --Don't try to power non-AS-Interface devices - for instance a light curtain or horn - from the yellow AS-Interface cable
  • --In the control panel, try to separate communicating devices (like AS-Interface) from high power (and thus possibly high noise); use dividers if possible

Visit our website to download the Troubleshooting Guide.

Direct download: techtalk124.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Did you know that AS-Interface segments should be no longer than 100 m?  In some cases it is possible to extend that length to 200 m using a terminator.  In very rare cases an AS-Interface tuner can be used to set up even longer AS-Interface segments ... at a price.

  • --As always, sticking to the rules is best.  Keeping segments to 100 m or less allows network segments to be shaped arbitrarily
  • --The terminator works well when a segment is over 100 m but less than 200 m
  • --Do not use a terminator if the network does not need it; more is not better
  • --When using a terminating device it is important to make the segment as linear as possible
  • --The terminating device must be as far from the power source as possible
  • --Stay away from the tuner

Visit our website to download the Troubleshooting Guide.

Direct download: techtalk123.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

When installing AS-Interface, pay attention to how the AS-Interface cable and a 24 VDC AUX cable are routed together.

  • --DON'T strap an AUX power cable to an AS-Interface yellow cable
  • --DO separate the AS-Interface cable at least 20 cm (8") from a noisy AUX cable
  • --DON'T strap the black AUX to the yellow AS-Interface cable
  • --If a noisy power cable needs to cross a communication cable (like AS-Interface), DO so at 90 degrees

Visit our website to download the Troubleshooting Guide and other documents noted in this episode.

Direct download: techtalk122.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface power supplies are designed to power the connected devices and allow safe and fast AS-Interface communication.  Every now and then, the term Power24 comes up.  Tim explains how AS-Interface power supplies are different (compared to conventional 24 VDC power supplies) and what Power24 really means.

  • --AS-Interface power supplies operate with 30.5 V.  Consequently, AS-Interface devices do not need expensive DC-DC converters
  • --Integrated decoupling enables communication and power on the same 2-conductor cable
  • --Power24 is a limited specification with reduced segment length; decoupling is still necessary
  • --Large installations can take advantage of decoupling inside the gateway
Direct download: techtalk121.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Building long AS-Interface networks is also possible using a terminator. In this episode, Tim and Helge clarify just how long AS-Interface networks can be:

  • --When used properly, a terminator can allow AS-Interface segments to be up to 200 m long
  • --Terminators come integrated in the repeater or as external stand-alone parts
  • --When building networks combining 200 m long linear segments, always use a fast, advanced repeater
  • --It is strongly suggested to evaluate the communication quality of these longer networks. The AS-Interface analyzer is an ideal tool.
Direct download: techtalk120.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Using AS-Interface is all about building segments and networks. In this episode, Helge and Tim cover the following points about building long AS-Interface networks, and what to know about AS-Interface segments:

  • --Segments can be 100 m long
  • --Multiple segments can be combined to build longer networks
  • --Segments are combined using repeaters; 500 m is easily possible
  • --Each segment must have its own power supply
  • --Ring segments are possible and can be 200 m long
Direct download: techtalk119.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

While AS-Interface has been designed to operate without termination, there are cases where a terminator for AS-Interface can be quite useful.  Recall that AS-Interface network segments must not be longer than 100 m.  Violating this limit causes reflections at the end of the network resulting in communication issues, causing the network to run increasingly less stable.

  • --Using an AS-Interface terminator at the end of the network can help reduce reflections and thus in many cases allows network segments to be up to 200 m long
  • --Only one terminator must be used per segment
  • --Always put the terminator at the “opposite side” of the AS-Interface power supply
  • --Do not use a terminator if the segment is 100 m or shorter
Direct download: techtalk118.mp3
Category:AS-Interface Technology -- posted at: 4:19 PM

The AS-Interface Analyzer is a powerful tool to evaluate the communication quality of the AS-Interface network.  The Online Statistics screen is a very quick and simple way to determine how well the network runs.  This view is also very useful when trying to find safety-related issues.

Read the AS-Interface Maintenance and Troubleshooting Guide (PDF)

Direct download: techtalk117.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Repeaters allow AS-Interface segments to be combined to create longer networks.  When using AS-Interface repeaters there are few simple rules that need to be observed:

  • --Each new segment must have its own AS-Interface power supply
  • --Starting at the gateway, no slave can be more than two repeaters from the gateway
  • --Consequently, networks that are much longer as 300 m are possible

Read the AS-Interface Maintenance and Troubleshooting Guide (PDF)

Direct download: techtalk116.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

LEDs are powerful diagnostic indicators on just about all AS-Interface devices. The simple rule is that "green" is good and “red" requires someone’s attention.  Outputs are an interesting exception where "amber" indicates that the output is ON.  The AS-Interface Maintenance and Service Guide(PDF) also lists the LED states on the "consortium" Safety Monitor.

Direct download: techtalk115.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM