UK AS-Interface Expert Alliance Tech Forum

ASi & ATEX Zones

2008-10-27T19:31:32Z

I am looking at one of the specifications asking us to implement Asi bus in Hazardous area, where filed mounted ON-OFF valves are in ZONE 1,Group IIA/IIB). As Asi bus carries power & the valves are used for monitoring & control of process,I am not sure 1)whether Asi bus system is suitable for ZONE 1,Group IIA/IIB for monitoring & control of ON-OFF Valve that are frequently operated 2)

If suitable,how to make it suitable & what specific components are to be chosen. I mean if we locate Asi Master/Slaves in this area,what additional features are to be specified/considered while designing to conform to ZONE 1,Group IIA/IIB

ASI safety system fails EMI susceptibility tests.

2009-12-31T19:48:10Z

We are currently performing EMC susceptibility tests on our machine, which is equipped with an ASI safety at work safety system.

The system trips when a 1.5Kv spike is fed into the 3-phase mains input. Although failsafe and easily reset I wish to minimise the possibility of nuisance trips of the safety system.

Are there any guidelines regarding filtering the power supplies and/or application of ferrites to the ASI cable?

The system is Pepperl and Fuchs based. It has shown to be very robust during normal machine operation. Should I be worried about it tripping at 1.5KV? The machine is going to Holland so there ought not to be any dirty mains issues.

MCR

ASi to Modbus?

2008-10-27T19:27:52Z

I am trying to find a 2.1 version AS-I to Modbus gateway that will support two networks with 167kbd. Is there such a thing?

ASI Cable Specifications

2008-12-11T03:46:54Z

Where can I get a spec on minimum bend radius for ASi cable. Have searched cable supplier web sites but cannot find detail.

A/B Network Safety

2008-10-27T19:32:51Z

I would like to use use AS-I safety modules in networks with more than the 31 slaves.

Will AS-I safety work on A/B networks with up to 62 slaves ?

Drag Chain

2008-10-27T19:29:10Z

Hi,

I am actually working on a project where I m going to install a new manufacturing line fully automatic. I am going to use the ASI technology for the automation.
my request is : I need to bring the two asi wires in a drag chain (need to control a trolley).
Do they cable are ok for this utilisation. Won t I have any problem with ?

thanks for your help

ASI Power24?

2010-06-24T10:15:12Z

I am wondering why there hasn’t been any news about this, other than some devices now becoming available supporting it.

See:

http://www.pepperl-fuchs.us/cps/rde/xchg/usa/hs.xsl/202_module.htm

Is this a new standard which will do away with the need for special ASI 30V supplies?

Please tell me more.

Regards

MCR

AS-i Power Fail

2009-06-15T05:37:13Z

We have a conveyor system with a Siemens S7-317 2DP with 3 DP/AS-i Link gateways (6ES7194-5AA00-0XA0). At one of the gateways we are getting the “AS-i Power Fail” led flicker.

The AS-i bus PSU is an IFM AC1206 (http://www.ifm.com/ifmuk/web/dsfs!AC1206.html).

The AS-i network from this gateway daisy-chains out to approx 20 nodes of IFM AC2701 (http://www.ifm.com/ifmuk/web/dsfs!AC2701.html).

At node 3 we have an isolator auxillary input on I+ and I1 and an IFM OC5230 (http://www.ifm.com/ifmuk/web/dsfs!OC5230.html) on I+, I- and I3 via wires 1, 3 & 4 of the sensor. This sensor and cable have been renewed to rule them out.

The DP/AS-i Link indicates “Slave 3” flashes the AS-i Power Fail led. We have seen the IFM PSU power led flicker which led us to renew it with a new IFM AC1208 (http://www.ifm.com/ifmuk/web/dsfs!AC1208.html) which just seem to freeze the DP/AS-i Link. This happened when we tried another AC1208. We tried a known-to-be-working AC1206 from one of the working gateways on this system which worked. The PSU is set to 115vac. This supply is constant.

The AS-i node has been renewed along with the DP/AS-i Link. The cables have been checked out between nodes - SY cable not yellow AS-i cable - the inputs to this node 3 have been disconnected which stops the fault. The fault only occurs when we have the OC5230 connected. We tried another sensor but after an hour or so the fault re-emerged. Without this sensor connected to this AS-i node the network is fine yet the system has been running previously without a hitch. The voltage at the node is a constant 29.6vdc.

Can anyone point me to something I may be missing or have overlooked, please?

Thanks in advance.
s.f

Has anyone done the sums?

2009-04-30T22:43:12Z

I get the feeling that an IO subsystem based on ASI would be considerable cheaper than alternative bus systems I could mention. Typically systems have a number of distributed IP6x “master” bus nodes located at strategic points around the machine with M8/M12 or valve banks radiating off or bus interfaces connected via a backplane to M12/M8 nodes.

Although these systems involve less cabling and therefore less labour than a hardwired system they are still fairly expensive in hardware terms.

What I’m wondering is has anyone done any sums, ideally comparing hardware and labour costs between the three systems - 1. direct wired using multicore cables connected to M12/M8 distribution blocks, 2. BUS system (such as Murr CUBE67 or Siemens ET200) 3. ASI based system.

I’m in the process of producing a control system for a medium sized packaging machine handling 240 products per minute, involving 11 servo axes and 5 speed control inverters, a press, a printer, heaters, hot-melt, slitter knives, vision system QC, collation etc.

MCR

Performance Levels

2009-06-04T16:28:24Z

With the new standard 13849 kicking in to replace 954, everything is about achieving required Performance Levels. I am using the free Sistema software, and thoroughly confused as to how ASI Safety at Work fits in. Some manufacturers say that the use of ASI SAW means that all components are above and beyond PLe and therfore the very use of ASI SAW makes your system comply . . . I think not!
Where can I find a library of MTTFd and such for ASI components, as getting these required numbers together is like pulling teeth!!!