If the I/O are low (<16), nothing beats hardwiring. As the point count goes up, the cost benefit ratio moves to a gateway of some type. Regards, Alex Johnson Invensys Process Systems Invensys Systems, Inc. 10707 Haddington Houston, TX 77043 713.722.2859 (voice) 713.722.2700 (switchboard) 713.932.0222 (fax) ajohnson@xxxxxxxxxxx -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of Baptiste, Nigel Sent: Monday, May 23, 2005 3:21 PM To: foxboro@xxxxxxxxxxxxx Subject: Re: [foxboro] Foxboro I/A interface with PLC5/30's Thanks Chuck. The I/A system (Unix based) will be doing the boiler combustion controls = and motor control as well as data acquisition. The project is still in the planning stages so I am seeking advice on = how to proceed. We can do either of your options but I would like to = know which is your recommendation based on your experience. NB. -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Jones, Charles R. (Chuck) Sent: Monday, May 23, 2005 4:12 PM To: 'foxboro@xxxxxxxxxxxxx' Subject: Re: [foxboro] Foxboro I/A interface with PLC5/30's I've done this and I'm sorry to hear about your troubles... But = seriously, now it's not as bad as it once was. Before we can begin to send you advice, can you let us know whether you = are running on Unix or Windows? =20 And, will your I/A system primarily supply the user interface or will = there be controls as well? =20 Or, better yet (since the PLC is only for BMS), can you focus your I/A = to AB interface down to passing a few digital bits of information back and = forth? Is it good enough that the I/A can just say, "Turn ON (or OFF) the = flame" and is it okay if the I/A only has to know whether the flame is ON or = OFF? Chuck Jones Refinery Automation Technologist Tate & Lyle -- Lafayette South Plant 765.477.5324 - Office | 877.536.9219 - Pager -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] = On Behalf Of Baptiste, Nigel Sent: Monday, May 23, 2005 2:59 PM To: foxboro@xxxxxxxxxxxxx Subject: [foxboro] Foxboro I/A interface with PLC5/30's Hello list, Does anyone have experience interfacing I/A with AB PLC5/30's? I have to integrate the two for combustion control & burner management = =3D on a steam turbine generator unit. The combustion controls would be replaced with the I/A system but the = =3D budget does not permit the replacement of the PLC based BMS. Hence I'm seeking the best way to interface the two systems. Regards, Nigel Baptiste. =20 =20 _______________________________________________________________________ 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 =20 foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 *************************************************************************= **************************** This email and any files transmitted with it are confidential and = intended solely for the=20 use of the individual or entity to whom they are addressed. If you are = not the intended=20 recipient or the person responsible for delivering the email to the = intended recipient, be=20 advised that you have received this email in error that any use, = dissemination,=20 forwarding, printing, or copying of this email is strictly prohibited. = If you have received=20 this email in error please notify the sender immediately. Please note = that we reserve=20 the right to monitor and read any emails sent and received by the = Company in=20 accordance with and to the extent permitted by applicable legal rules. *************************************************************************= **************************** =20 =20 _______________________________________________________________________ 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 =20 foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ 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 _______________________________________________________________________ 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