UK AS-Interface Expert Alliance Tech Forum

Maximum Cable Length’s

2008-12-11T03:48:57+00:00

Where can I get information on the maximum length of ASi cable I can use before I need to use a repeater?
Also is there a maximum number of repeaters that can be used in one run.

ASI Power24?

2010-06-24T09:15:12+00:00

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

Has anyone done the sums?

2009-04-30T21:43:12+00:00

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

Taking scope traces of the As-I waveform

2008-11-08T01:19:23+00:00

What are the nominal values for amplitude and frequency of an As-I signal? What are the acceptable levels for noise?

When investigating communication issues, how can one determine if its due to noise or something else? How can such issues be resolved?

Using shielded twisted pair as As-i cable

2009-02-09T23:38:40+00:00

What happens if a shielded twisted pair is used for an As-i network? Does it cause communication issues or limit the maximum allowable segment lenght?

Where and how should the shield wire be connected?

Siemens AS-i network analyzer parameter

2009-02-19T03:47:30+00:00

What does the parameter “Slave Telegrams Without Master Call” mean? This parameter is found on the Advanced Statistics tab on the Online Statistics window of the Siemens As-i network analyzer.

How to read out a slave of profile S-7.3 through a gateway of specification ASi-2.0 ?

2008-11-07T16:11:51+00:00

It is possible at all?

I have an issue almost in accuracy same that I have found in official forum Siemens:

oshaman wrote:

“I have recently replaced some analogue Asi modules type 3RK1207-1BQ00-0AA3 with newer type; 3RK1207-1BQ40-0AA3 2AI S7.3.D. Whilst the old units were working OK, I have a problem in that the new modules cannot read analogue signals. I have some DP/ASi link 20E as ASi master to these modules. How can I get these modules to read analogue signals. Are there any FBs or SFCs that I need to use. What is difference between these modules because I had thought that it should have been a direct swoop with no problem at all.”

The question has been successfully solved because Siemens gateway Link 20E support ASi 2.1 specification. More over, Siemens offers two ways for ASi slaves S-7.3 reading through ASi 2.1 Profibus-ASi gateway - by means of use SFC59 (easier, but less diagnostic information) and SFB52 (slightly hard, but more of diagnostic information).

My issue is more difficult because I deals with ASi 2.0 AC1005 gateway from ifm.

I have not found out any information that it is impossibly to read out ASi slave of S-7.3 profil through gateway ASi 2.0, but I have not find out any information about how to do it too!

PS: At the moment, for reading analogue input of ASi slave of profile S-7.1 is used not clearly whence taken FC10 “ASI: Analog value ASI”, author - Siemens. The programme block does not read S-7.3 slaves, but ASi 2.0 gateway AC1005 sees it without any communication errors, but read value - 7FFF constantly.

New SFC59 and SFB52 blocks read value:
- if number of slave is 16 and less - 7FFF
- if number is 17… 31 - 0.
Errors:
“DP protocol error at layer 2 (for example, slave failure or bus problems)” if SFC59 used
“no DPV1 protocol element is used” for SFB52.

Does anyone can help me?

Two Masters on One Power Supply?

2008-10-27T19:27:00+00:00

Can we connect two masters to same power supply unit parallely?

ASi enclosure for mounting custom circuits

2009-04-02T16:23:42+00:00

I am trying to find where I can source some empty ASi modules for mounting custom circuits / PCBs.
I would like to mount a DC-DC converter circuit in a module to clip onto an ASi power cable so that I can get a small 5V supply from the ASi cable.
Does anybody know of any manufacturers and model numbers who can supply a small number of empty modules?

ASI Cable Specifications

2008-12-11T03:46:54+00:00

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