Share your knowledge about "Profibus PA"
Share your knowledge about "Profibus PA"
(OP)
Hi,
Our Profibus system is DP and we used PA just recently for the process instruments like flowmeters,temperature,pressure transmitters or positioning valves but knew very little about allocating I/O's for these instruments. Is there any specific numbers of I/O's needed and how many of them to allocate for each Instru?(PLC used: Siemens TI and S7-400)
Your input on this querry will be valued!
fault40
Our Profibus system is DP and we used PA just recently for the process instruments like flowmeters,temperature,pressure transmitters or positioning valves but knew very little about allocating I/O's for these instruments. Is there any specific numbers of I/O's needed and how many of them to allocate for each Instru?(PLC used: Siemens TI and S7-400)
Your input on this querry will be valued!
fault40





RE: Share your knowledge about "Profibus PA"
We did a project 2 years ago using TI555 PLCs and Siemens Sitrans flowmeters. On the DP side, we could configure the DP/PA link (IM157) as a Profibus-DP slave in ComProfibus; but we could not see the PA side . We needed to generate a PA profile ( in Simatic PDM) for every device on the PA side. Once this setup was integrated in the DP config, we could merge the ComProfibus file in TiSoft; we were then told how many words we needed to reserve for the PA devices.
Simatic PDM can be integrated in Step & (especially useful if programming S7 CPUs); it can be used for Profibus Pa devices or HART communications. The file can be exported to Tisoft or Step5. Please look at the Siemens support webpages (start at www.ad.siemens.de, then Support, service and support...) for more info and manuals.
Hope this helps,
Daniel Chartier