Dirk, I have another suggestion (or maybe just a style point). I try not to put more than one network call into a single line of code. For example: IF (:PRESS_CP4:PT_HOPPERR1.PNT - :LOGIC_PRESS:R1_PRESS.RO01) < RI0002 AND :PRESS_CP4:PT_HOPPERR1.PNT < 5 THEN In that line there are three calls to the network for information (one is called twice). Each call causes the current sequence to wait for at least one BPC of the sequence block. If one of the calls fails, how will you know which is the problem? The sequence block error message will only give you the line number in the sequence. Another way to write the same code would be to use some new variables: HOPPERR1 := :PRESS_CP4:PT_HOPPERR1.PNT; R1_PRESS := :LOGIC_PRESS:R1_PRESS.RO01; DeltaPress := HOPPERR1 - R1_PRESS; IF (DeltaPress < RI0002) AND (HOPPERR1 < 5.0) THEN It may only be a style point, but I have had fewer problems since I started breaking things up. Chuck Jones Automation Technologist Tate & Lyle Lafayette Plant ******************************************************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the email to the intended recipient, be advised that you have received this email in error that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify the sender immediately. Please note that we reserve the right to monitor and read any emails sent and received by the Company in accordance with and to the extent permitted by applicable legal rules. Tate & Lyle PLC, registered in England: number 76535. Registered office: Tate & Lyle PLC, Sugar Quay, Lower Thames Street, London EC3R 6DQ. Tate & Lyle Industries Limited registered in England:number 699090. Registered office: Tate & Lyle Industries Limited, Sugar Quay, Lower Thames Street, London EC3R 6DQ ********************************************************************************************************* _______________________________________________________________________ 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