Pepperl+Fuchs Podcasts


AS-Interface Technology





September 2014
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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

AS-Interface Safety Monitor -- The Safety Monitor is the safety controller of an AS-Interface Safety at Work system. As a PL e rated device it is able to be used in the most demanding safety applications. The VAS-2A8L-KE4-8SE Safety Monitor introduced here can process safety date data from up to 31 safe rated devices (e-stops, door switches, modules ...) connected to the network and 4 safe rated inputs connected locally to the Safety Monitor directly

  • --Rated to PL e for highest safety requirements
  • --Integrated memory card
  • --On-board safe and non-safe inputs / outputs
  • --Two safe rated electronic safe outputs
  • --USB configuration and diagnostics interface
  • --Full standalone operation
Direct download: techtalk82.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Power Supplies (VAN-115/230AC-K27) and repeaters for AS-Interface -- Power supplies are important.  Fortunately, selecting them is fairly straightforward when considering a couple of specification parameters.  AS-Interface Repeaters are typically used to extend the total length of a network.

  • --Select the AS-Interface power supply to match your available input voltage.  When fusing the input side, take a look at the total current consumption of the supply
  • --Output current specifies how much current can be provided to power modules, the gateway, and possibly, a repeater
  • --AS-Interface power supplies are primarily designed for AS-Interface.  Thus their secondary voltage is fixed at 30.5 V
  • --Just as with the gateways, make sure they are mounted such that they are properly vented to keep the operating temperature within the specified range
  • --Repeaters are easy to use. They are bi-directional ... but watch out when using a repeater with a terminator
Direct download: techtalk81.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Gateways part II -- Continuing talking about the AS-Interface gateway (VBG-ENX-K20-DMD) Tim explains:

  • --The interface section describes, among other things, what kind of upper-level network the gateway supports
  • --The data sheet also specifies that modern Ethernet redundancy via Device Level Ring (DLR) topology is supported
  • --The interface section also identifies diagnostics interface options and the availability of a chip card
  • --It is a good idea to watch the ambient temperature rating; just don't install the gateway in a closed-off box
Direct download: techtalk80.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Gateways -- For this episode, Tim selected an AS-Interface EtherNet/IP gateway (VBG-ENX-K20-DMD) supporting two AS-Interface networks.

  • --The master specification (M1-M4) identifies the capabilities of the gateway.  Today it is best to accept only gateways that are built to the M4 specification
  • --Some gateways have integrated higher level programming ability using, for instance, C
  • --Duplicate address detection, earth fault detection, and EMC monitoring are valuable diagnostic features
  • --LEDs are still used to provide direct user feedback.  As is true in nearly all cases. "all LEDs green" is a good thing
Direct download: techtalk79.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

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