http://profibus.cl0.vanillaforums.com/discussions/feed.rss Thu, 23 Feb 12 05:28:43 -0500 All Discussions - profibus en-CA http://profibus.cl0.vanillaforums.com/discussion/21/seo-tools-voted-the-best-seo-service-the-year Thu, 08 Sep 2011 23:32:19 -0400 jaderamste 21@/discussions SEO Software]]> http://profibus.cl0.vanillaforums.com/discussion/20/online-jobs-for-all Thu, 01 Sep 2011 03:40:53 -0400 jimmypqauy 20@/discussions Internet Jobs .
Or, Online Employment.]]> http://profibus.cl0.vanillaforums.com/discussion/18/communicate-with-a-2-different-drive-marke Tue, 24 May 2011 04:15:01 -0400 bekya 18@/discussions http://profibus.cl0.vanillaforums.com/discussion/19/winner-for-the-40-tv-at-process-show Mon, 30 May 2011 02:23:52 -0400 Rob_Mackenzie 19@/discussions http://profibus.cl0.vanillaforums.com/discussion/17/process-expo-2011-starts Tue, 24 May 2011 02:12:11 -0400 Rob_Mackenzie 17@/discussions http://profibus.cl0.vanillaforums.com/discussion/15/no.-of-slaves-on-siemens-cpu Fri, 15 Apr 2011 05:52:11 -0400 Christovd 15@/discussions
I want to run the following on a single 417-4 CPU.
22 x ET200 stations
26 x OLM's
400 x Simocodes

What is the maximum no. of Simocodes per CP443-5 that can run reliably.

I know that Siemens spec up to 127, but has anybody ever gone this much?


Christovd]]> http://profibus.cl0.vanillaforums.com/discussion/16/training-at-process-2011 Wed, 20 Apr 2011 05:01:05 -0400 Rob_Mackenzie 16@/discussions
SARPA is running training courses free of charge at the Process Show 2011 on all three days. Training will be given by the PCC and will focus on trouble shooting and the tools which are used. Log into http://www.process-expo.co.za/ to register.]]> http://profibus.cl0.vanillaforums.com/discussion/14/waveform-analysis Wed, 16 Feb 2011 07:34:08 -0500 BilalMoolla 14@/discussions I wanted to find out if someone could interpret this waveform for me please. There is a ringing voltage at the bottom. my email is bilal.moolla@siemens.com
I cannot attach any file to this discussion which makes it a bit difficult to explain.
If someone could email me, I can reply with the waveform.
Thanks
Much Appreciated.]]> http://profibus.cl0.vanillaforums.com/discussion/13/incorrect-polarity Fri, 14 Jan 2011 04:26:56 -0500 wreddy 13@/discussions http://profibus.cl0.vanillaforums.com/discussion/12/compliments-of-the-season-and-good-luck-in-2011 Wed, 15 Dec 2010 08:54:51 -0500 Rob_Mackenzie 12@/discussions
A message from the SARPA committee to say all the best for 2011. Hope you have a peaceful and safe holiday season, and thanks for your support at our various events in 2010.

Look out for our 2011 technical seminars and keep using Profibus.

Best Regards
Rob MacKenzie
Chairman South African Regional Profibus Association]]> http://profibus.cl0.vanillaforums.com/discussion/10/byte-swapping Thu, 14 Oct 2010 01:59:03 -0400 danie 10@/discussions http://profibus.cl0.vanillaforums.com/discussion/11/profi_user-breakfast-in-cape-town Thu, 18 Nov 2010 06:03:13 -0500 Rob_Mackenzie 11@/discussions
Great breakfast in Cape Town yesterday and good discussions after. From those that were there please give ideas on what to improve or do next time

Regards
Rob MacKenzie]]> http://profibus.cl0.vanillaforums.com/discussion/9/the-correct-profibus-dp-cable Thu, 07 Oct 2010 10:52:13 -0400 MichaelGarnham 9@/discussions
We at the PCC (PROFIBUS Competence Centre) are being called out to numerous sites that are having PROFIBUS trouble and we are finding one of the most fundamental rules of PROFIBUS is being broken, that being, the wrong cable is being used. The operators of these networks are not even aware of this.

“What should I be looking out for?” PROFIBUS DP cable is purple. However, just because your cable is purple, it doesn’t necessarily mean that it is PROFIBUS DP cable. The cable should be made up of a purple outer PVC coating (which normally says PROFIBUS DP cable on it), a stranded shield (for high frequency noise), a foil shield (for even higher frequency noise), a strengthening substrate, and finally two coloured cores (red and green).

You also get cable that is specifically made for PROFIBUS PA. A blue one is used for PA in Intrinsically safe environments and a black one is used for non-intrinsically safe environments. These cannot be used on DP.

Use the stranded core variant for places with vibration or movement – just keep in mind that fast connector plugs can only be used on the solid core variant.

“My plant has been running fine for years, why the sudden issues?” It’s true. PROFIBUS networks can run for a very long time on the wrong cable before they give any trouble, especially if you are running your network at a low baud rate. The trouble is that your network may be operating just within the tolerable thresholds of operation, when a change in the environment (temperature changes, voltage spikes, noise, etc) causes the network to suddenly fall over.

Interested in the science stuff? Well, a PROFIBUS DP cable has an impedance 150 Ohm (unlike conventional RS-485 cable which is at 120 Ohm). The impedance of the cable changes drastically at the end of the cable and the signal energy travelling down the cable finds nowhere to go an gets reflected back (reflections). Reflections can cause multiple signals to appear, corrupting the original signal. This is why we insert terminations at each end of the cable – they absorb this excess signal energy. PROFIBUS devices and plugs with built in terminators have had their terminators designed to match the cable impedance. When you use the wrong cable, the impedance is no longer matched and reflections occur.

Okay, that's it for now. Do leave any comments or questions that you may have. In the mean time, I hope this helps someone out there!

Michael Garnham
PCC
]]> http://profibus.cl0.vanillaforums.com/discussion/2/is-the-siemens-pdm-tool-the-best-in-class-tool-for-operational-management-of-profibus-pa-devices-or Fri, 04 Jun 2010 05:27:08 -0400 JohnJones 2@/discussions Is PDM handy? Does it give what's really needed? How does it facilitate replacement of a broken PA instrument?
]]> http://profibus.cl0.vanillaforums.com/discussion/8/tips-on-how-to-make-your-profibus-network-more-reliable Tue, 07 Sep 2010 04:10:58 -0400 BrendanGunn 8@/discussions
1. Retries/Repeats count - When a message fails, due to a number of reasons (induced noise, duplicate addresses, reflections), the master will send a repeat of that message. The number of repeated messages is determined by the "retries/repeat count" bus parameter stored in the master. If this number is exceeded, that device will "fall off" the network and will have to be reconfigured.

2. Tqui - The quiet time is the amount of time the master should wait after sending a transmission before activating its receiving bus driver. If there are reflections, it allows them to die out before listening or transmitting the next message.

3. MinTSDR - The minimum station delay for response is the smallest amount of time that the master is required to wait before sending a response.

Retries/Repeats = 3/5
Tqui = 9
MinTSDR = 22

If you have any other good ideas please add them. I am sure people would really appreciate learning from them.

Brendan Gunn
PCC]]> http://profibus.cl0.vanillaforums.com/discussion/7/industrial-ethernet Thu, 01 Jul 2010 08:57:15 -0400 Rod_Englund 7@/discussions The question remains, will enough customers demand Ethernet connectivity to motivate instrumentation suppliers to produce it?
While Ethernet networking and power over Ethernet have spread to devices in home, office, and commercial environments, industrial applications are still rare. ]]> http://profibus.cl0.vanillaforums.com/discussion/5/companies-to-certify-my-network Thu, 10 Jun 2010 10:30:13 -0400 Merick Johnson 5@/discussions http://profibus.cl0.vanillaforums.com/discussion/6/profi-technology-conference-in-prague Mon, 14 Jun 2010 05:11:35 -0400 Rob_Mackenzie 6@/discussions http://profibus.cl0.vanillaforums.com/discussion/3/profinet-is-based-on-proven-it-standards Tue, 08 Jun 2010 06:49:39 -0400 Francois_Venter 3@/discussions
Profinet is well suited for both Factory and Process environments. In the factory environment Profinet is used as a high speed backbone for various functions from robotic control to HMI interfacing right through to the ERP level. In the Process environment Profinet is typically used as a high-level bus to interconnect different sections of the plant together and also to distinguish between the industrial and IT environments. Profinet also interface well to Profibus DP, Profibus PA, IO-Link and other bus system like Modbus, Foundation Fieldbus, ASI Bus and others.

Profinet is particularly useful where the IT departments took ownership of all Ethernet systems and C&I departments have very little control. Now with the integration of Profinet, the C&I departments can claim this area back due to the fact that Profinet is an industrial network and not a standard IT Ethernet network. ]]> http://profibus.cl0.vanillaforums.com/discussion/4/save-energy-with-profienergy-during-production-breaks Tue, 08 Jun 2010 06:57:30 -0400 Francois_Venter 4@/discussions
The vendor-independent and device-independent Profienergy profile standardized according to the PI enables individual devices or even entire sections of a production plant to be shut down without external hardware using a single controller via Profinet communication. Loads are switched off during production breaks in a coordinated fashion from a central location while other automation components are able to remain in operation, for example for safety-related tasks. At the end of the break the loads are then switched on again in a coordinated manner. ]]>