Pepperl+Fuchs Podcasts


AS-Interface Technology





October 2014
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In this episode, AS-Interface expert Tracy Molnar talks about typical customer topics she is dealing with frequently when discussing AS-Interface modules. Her three most common topics are:

  • --VAA and VBA modules and what kind of an address do I need? full address or half address?
  • --Disabling inputs on the AS-Interface G11 analog input module and why a user would be interested in doing this.
  • --Most inputs on AS-Interface digital modules are wired such that connector ports 1 and 3 also give access to inputs 2 and 4.  Use V11 3-wire cables when this is not desirable.

Get data sheets and manuals for AS-Interface modules on our website.

Direct download: techtalk92.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Common Questions about AS-Interface Part II -- Zach continues to talk about three most common AS-Interface topics he discusses with customers:

  • Cabling options including color (black/yellow), chemical resistance, lengths, and higher diameter options
  • AS-Interface intelligent sensors vs. standard sensors with AS-Interface modules
  • ASiMon software is downloadable for free from the website.  This version is ideal for maintenance and service but does not allow any changes to the configurations
Direct download: techtalk91.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Common Questions about AS-Interface Part I - Today, AS-Interface expert Zach Steck talks about the most common AS-Interface questions he is dealing with as an application engineer. Here are the top three topics Zach commonly discusses with customers:

  • Network length and how to extend a network
  • How to replace an (older style) VAA I/O module using a (new style) VBA I/O module
  • What options do customers have in terms of cable that can be used with AS-Interface?
Direct download: techtalk90.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface safe coupling -- in the past, situations where safe data had to be shared between separate independent system users used a trick, where a safe output on one AS-Interface network was connected to a safe input on another. Later, the ability to share an entire network between several AS-Interface gateways was added, allowing 31 pieces of safe data to be shared.  Recently, SafeLink was introduced allowing safe data sharing over Ethernet.  This method has many advantages:

  • --Sharing data on Ethernet frees up the shared AS-Interface network
  • --Each gateway can now share 31 safe data points
  • --The total system can use 1922 safe rated devices exchanging 961 safe data points
Direct download: techtalk89.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Safety Code Substitution -- In this episode Tim mentions that AS-Interface Safety at Work is based on the transmission of dynamic data called the "safety code". While the dynamics of the data is required so that the Safety Monitor can determine what is going on at the safe inputs. To simplify diagnostics logic on the PLC, a simple code substitution procedure was introduced several years ago.  The latest generation of AS-Interface gateways with integrated safety controller took this a step further. With this diagnostic code substitution it is possible to:

  • --Know which safety contact is open and which contact is closed (red/green/grey)
  • --Identify if a safety device requires testing (yellow flashing)
  • --Detect if a safety device caused a critical error (red flashing)
  • --See if a device is 'ready", awaiting for instance a RESET (yellow)
Direct download: techtalk88.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface parameter bits -- This week Tim explains what AS-Interface parameter bits are. Using AS-Interface parameter bits users can configure AS-Interface modules to perform certain operations.  Users should know that the default operation of the modules have been selected to cover nearly all cases and modifying the parameter bits is only needed in rare cases.  By default the parameter bits are "1" or "ON".  Tim also explains the difference between 'parameters' and 'power-up parameters'.  Users should know that:

  • --Parameter bits are not stored on the module
  • --While the hand-held can change a parameter bit, disconnecting the module will always reset them to "1"
  • --The PLC can be instructed to send parameter bits during startup or even during normal operation
  • --Parameter bits can be set through the display on the gateway
  • --ControlTools software is another way of setting parameter bits
Direct download: techtalk87.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Analog data for AS-Interface -- This week Tim talks about the universal AS-Interface analog input module in the G11 housing.  This analog input module offers exceptional application flexibility and:

  • --Powers the transducers from either AS-Interface or AUX power
  • --Allows any combination of current, voltage or PT100 inputs
  • --Auto detects what kind of transducer has been connected
  • --Its operation can also be modified using its parameter bits
  • --Allows single-channel operation by jumper-deactivation of channel 2
Direct download: techtalk86.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Usage example -- This week, Robert talks about a specific AS-Interface application involving the safety encoder.  The video "Using a Safety Encoder on AS-Interface" goes through the configuration and setup of the system. The AS-Interface system covers the following operational situations:

  • --When all gates are closed the process will run, up to the over-speed limit
  • --If the press needs to be cleaned it is now possible to clean it under power. Here direction of rotation and creep speed is validated.
  • --By eliminating the need to stop, clean, restart, and jog repeatedly, the process is now considerably faster
Direct download: techtalk85.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Hardware -- The safety speed monitor evaluates data from the safe-rated encoder. In a nutshell, the safety speed monitor evaluates the sine/cosine signals from the encoder, and determines if the speed is within limits and if the direction of rotation is what it should be.

  • --The safe-rated encoder is built up redundantly with self-monitoring electronics and is third-party approved (TUV)
  • --The safety speed monitor determines if the motion is outside the limits set by the user.  A safe-rated signal is then sent to an AS-Interface safety controller
  • --The speed monitor can be used as part of an AS-Interface setup or as a stand-alone device
Direct download: techtalk84.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface application -- Many types of automation systems can benefit from safe-rated encoders. These rotary encoders may be used within an AS-Interface safety system. In a typical application, the safety encoder is used to safely determine the velocity of a rotation.  Being able to safely know when a machine has stopped, is moving clockwise or counterclockwise, or rotates at an overspeed limit allows better process design.

  • --Overspeed allows you to safely determine if a motor is operating at speed above a safe limit
  • --The safe determination of CW/CCW rotation is useful in applications where the direction of motion needs to be known to ensure safety; doors and lifts come to mind
  • --Safe stop assures that a machine has truly stopped before accessing the system for maintenance
Direct download: techtalk83.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM