Pepperl+Fuchs Podcasts


AS-Interface Technology





August 2014
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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

AS-Interface Safety modules -- In this episode, Tim explains how to read a data sheet for an AS-Interface safety input module.  Specifically, he is talking about a VAA-2E1A-G10 style device with two safe inputs and one non-safe conventional electronic output.

  • --The operating voltage and why it is important
  • --The rated operating current includes the current needed to run the module plus the maximum current for the non-safe output
  • --This particular module is designed for mechanically safe contacts.  This is related to the contact testing
  • --'Dynamic data bits' indicate that the input data is used to send the dynamic safety data
  • --Functional safety specifications are important parameters needed when evaluating the performance of the entire system where the module is used
Direct download: techtalk78.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Analog output modules -- Tim and Helge again talk about AS-Interface data sheets. More specifically, they are focusing on the data that is specific to analog output modules, such as the G11 AS-Interface module VBA-4A-G11-I/U-F.

  • --The voltage and current range specifies what kind of output signals the modules can generate.  While 0 V -10 V and 4 mA to 20 mA is normal, it is also possible to output current signals down to 0 mA.
  • --The supply section specifies whether the outputs are powered from the AS-Interface yellow cable or the back AUX cable.  The second option is, of course, able to provide a lot more current.
  • --Parameter bits are again used to modify the operation.  Frequently, the parameter bits are used to configure the module watchdog.
  • --On some modules, a DIP switch is used to lock in the type of output; either current or voltage.
Direct download: techtalk77.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface analog input module -- Tim and Helge are discussing a 2-input AS-Interface analog module VBA-2E-G11-I/U/PT100/F capable of servicing current, voltage, and temperature probes.

  • --The input section specifies what kind of analog transducer can be connected.
  • --The data sheet specifies if the inputs are powered from AS-Interface or AUX. Tim also explains why this is needed.
  • --Accuracy is one of the most important parameter user look at.
  • --Scaling has to do with the numbers as they show up in the PLC. Our modules scale such that 20 mA corresponds to 20,000 and 10 V is presented as 10,000.
  • --Scaling has to do with the numbers as they show up in the PLC. Our modules scale such that 20 mA corresponds to 20,000 and 10 V is presented as 10,000.
Direct download: techtalk76.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Digital I/O module -- Today Tim and Helge finish discussing the data sheet of the VBA-4E4A-G11-ZAJ/EA2L-F AS-Interface module.  Temperature and environmental data should not be overlooked.

  • --Make sure a module does not overheat.  This is particularly important for modules that are mounted in junction boxes.  Does the box offer sufficient air circulation?
  • --Shock and vibration data specifies the severity, frequency, and amplitude of shock and vibration.
  • --IP rating is an important parameter describing the environment (dust and water) a module can be subjected to.
  • --Look at the electrical diagram for a quick overview of how to wire the module and which pins provide what kind of operation.
Direct download: techtalk75.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

AS-Interface Digital I/O module -- In this week's episode, Tim explains the data concerning the outputs, profiles, data bit layout, and parameter bits for AS-Interface module VBA-4E4A-G11-ZAJ/EA2L-F.

  • --Typical AS-Interface modules with electronic outputs are sourcing 24 VDC plus.
  • --Depending on the "power source," digital outputs are powered from AUX or from AS-Interface.
  • --It is important to look at the total output current and watch for any restrictions.
  • --Profiles specify the "function" of a module; they are important in case a failed module must be replaced.
  • --Data bit layout is important since a PLC programmer needs to know where in the PLC map an input shows up and which PLC bits control an output.
  • --Parameter bits give the programmer the ability to modify the behavior of a module.
Direct download: techtalk74.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

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