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Isochronous mode SSI

7/10/2012 7:13 PM	Rate (0)
Homeroid_BL Posts: 211 Rating: (6)	Hi all! I want to use 1SSI module on ET200S. Manual says: Hardware Requirements You will require the following for the 1SS in isochronous mode: ● A CPU that supports isochronous mode ● PROFIBUS master or PROFINET controller that supports the constant bus cycle time ● An IM 151 that supports isochronous mode Does S7-1200 satisfy this as a Profinet controller, and CM1243-5 satisfy this as a Profibus master? (I chosen an IM that supports isochronous mode) Thanks!
Homeroid_BL Posts: 211 Rating: (6)
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7/11/2012 4:30 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/24/2025 Posts: 3042 Rating: (1061)	Hello Homeroid_BL I fear you are out of luck with using an S7-1200 CPU for this. Isochronous mode on Profibus requires DP-V2 functionality, the CM1243-5 doeshowever "only" support DP-V1. Isochronous mode on Profinet requiresIRT support (Isochronous Real Time), the on-board PN port does though"only" support Profinet RT. If Isochronousmode isa must have for your application (be it on Profibus or Profinet), have a look at the links below to be able to find a suitable solution: Profinet: Which IO controllers and IO devices support the following functions: IRT, prioritized startup, MRP, PROFIenergy, Shared device, I device and clock-synchronized mode? Profibus: Isochrone Mode manual Also, what you are looking for in the technical spec of the CPU is an entry for Isochronous mode support (done via OB6x in a 300 or 400),see the "OB" section of spec of the latest 6ES7317-2FK14-0AB0as an example. I hope this helps
	Last edited by: fritz at: 7/11/2012 6:20 AM typos Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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