Pepperl+Fuchs Podcasts


AS-Interface Technology





July 2014
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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

Digital I/O module -- One of the most important sections on an AS-Interface module data sheet covers electrical specifications of inputs and outputs. In this episode, Tim and Helge discuss the VBA-4E4A-G11-ZAJ/EA2L-F AS-Interface module, as an example.

  • --AUX -- Auxiliary power is typically used to power outputs.
  • --Rates operating voltage -- This is the voltage requirement available to the module at the location where it is connected to the cable.
  • --Operating current -- This is the current needed to run the module.  Sensors and load current are extra.
  • --Max. current -- This is the total current consumed by the module.  This includes the operating current, the current it can supply to the sensors, and the load current.
  • --Current loading capacity -- This the current the module can provide to run the sensors and the resulting load current.
  • --Input current – This is the internally limited load current.
Direct download: techtalk73.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

Digital I/O module -- There is a lot of information about an AS-Interface module that users can get from the data sheet. Tim and Helge go through the details on a technical data sheet for AS-Interface module VBA-4E4A-G11-ZAJ/EA2L-F, as an example.

  • --AS-Interface specification and Master spec -- This identifies to which specification the module was designed and what kind of master is required for the module.
  • --Safety-relevant data -- Even for nonsafety-rated modules, it is useful to have this data.  Most typically, it is used in SISTEMA when evaluating safety configurations.
  • --Indicators -- This includes LEDs for inputs, outputs, and all supply voltages.  Modules also indicate internal errors and peripheral errors using LEDs.
Direct download: techtalk72.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

The AS-Interface G12 module family has many unique features, making it the preferred solution in many instances. In this episode, Tim and Helge discuss  favorite advantages to remember:

  • --Completely tool-less installation – Installing the module on the flat cable does not require a screwdriver. This even includes the addressing jack.
  • --Metal M12 – This is a preference for many customers. All M12 connections on the module are metal. By the way, the base and the mounting bar are metal as well.
  • --DIN mount – Many customers ask for it and the metal mounting base on the G12 AS-Interface modules has it.
  • --Great fault indication – Just like the G11 modules, overland indication is per each output. It is important to know that overloading an output does not negatively impact inputs or control over the remaining outputs.
  • --Exceptional I/O selection – I/O mixes include all the common combinations like 4 input and 4 input/4 output. The G12 also comes in a less common 2 input/2 output and even as a 4-output version. Add an 8-input style, a safety module, and specialty solution with AUX powered inputs, and you have a great application solver.

Read the blog post: Industrial Sensors: Differences Between No-load Supply Current and Load Current


Direct download: techtalk71.mp3
Category:AS-Interface Technology -- posted at: 4:00 PM

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