Venu, Alex was right concerning the dynamic limits on the system. But there are also all kinds of static limits of the HLBL compiler itself. Find it documented in B0400DF, latest revision is G, chapter " Sequence Compiler Limits" on pages 53 and following. Here is the link to the document: https://support.ips.invensys.com/Content/Documents/IASeries/b0400/b0400df_g.pdf Hope that helps. Best regards / mit freundlichen Grüßen Marcel Sieling Technical Sales Consultant [cid:image001.gif@01CE0620.73EAA240]<http://iom.invensys.com/> T +49 2131 4062 - 302 F +49 172 50 3980 - 302 M +49 172 3980 - 302 E marcel.sieling@xxxxxxxxxxxx<mailto:tanja.gehling@xxxxxxxxxxxxxx> Invensys Systems GmbH - Hermann-Klammt-Str. 1-3 - D-41460 Neuss - Germany iom.invensys.de<http://www.iom.invensys.com/> *** Confidentiality Notice: This e-mail, including any associated or attached files, is intended solely for the individual or entity to which it is addressed. This e-mail is confidential and may well also be legally privileged. If you have received it in error, you are on notice of its status. Please notify the sender immediately by reply e-mail and then delete this message from your system. Please do not copy it or use it for any purposes, or disclose its contents to any other person. This email comes from a division of the Invensys Group, owned by Invensys plc, which is a company registered in England and Wales with its registered office at 3rd Floor, 40 Grosvenor Place, London, SW1X 7AW (Registered number 166023). For a list of European legal entities within the Invensys Group, please select the Legal Entities link at invensys.com. You may contact Invensys plc on +44 (0)20 3155 1200 or e-mail reception@xxxxxxxxxxxx. This e-mail and any attachments thereto may be subject to the terms of any agreements between Invensys (and/or its subsidiaries and affiliates) and the recipient (and/or its subsidiaries and affiliates). _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave