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to itsmoked: I don't mean 4..20mA loop. It's still digital, but 0 and 1 become, for example, -100mA and +100mA. When properly shielded and grounded (thanks IRstuff), it's more noise-proof. Are there some transcievers available on the market? (It's not really sophisticated - some MOSFET keys...

In a coal mine, two devices are communicating at 4,8kbaud over two-wire rs485 bus. There's lot of noise (with a lot of lost bytes), because the power cables from AC-drives lay near, and there's not really a way to avoid it. Unfortunately, I can't improve "communication skills" of devices...

FrancisL, controlnovice, rmw, thanks for replies! Actually, I was a bit confused by http://www.controlartsinc.com/split.htm My big ball valve is not purposed to be a control valve, and has strongly nonlinear characteristics. I can [try], of course, to eliminate this in PLC software. and...

frankeng9, Fuzzy Logic controllers are not simply a variation of PID control. A PID controller is linear, a Fuzzy controller can be "very" non-linear. But, of course, a common method of tuning a Fuzzy controller is tuning it to obtain a response similar to PID.

Hi, All, I have a typical PID control application and I'm still not sure what's the right name for it. Process - heat exchanger (oil cooled by water) Controlled variable - temperature of oil after the heat exchgr. Manipulated variable - "water in heat exchgr." inlet valve position There are...

I have an S5 PLC with CP1431 on ethernet (H1 bus). Now I need to read the data (several datablocks) from this PLC to other PLC (S5 or S7 - I can choose). Normally, I must configure an ethernet connection (for example, ISO Transport) and download new configuration into both partners. Can I...

Hi All, I'm looking for a good free reading about ISA-S88 Batch Control. Who know something better than http://www.batchcontrol.com/s88buddy.shtml Thanks!

Hi All, I'm looking for a good free reading about ISA-S88 Batch Control. Who know something better than http://www.batchcontrol.com/s88buddy.shtml Thanks!

MartinBEng, May be you can try to create custom Hardware Profile in Windows, reboot using it and disable all periferal devices besides CP (like USB, NIC, Sound etc.). Just another way to avoid resourse conflict.

MartinBEng, are there still device conflicts shown in device manager?

MartinBEng, May be you can try to create custom Hardware Profile, reboot using it and disable all periferal devices besides CP (like USB, NIC, Sound etc.). Just another way to avoid resourse conflict.

secrabigh, as far as I know Siemens products for redundant systems are named like normal products plus "H". H system can be configured using the same set of tools (the same Step5 or Step7). ad.support@siemens.com surely can help for free, but ask questions separately: 1st - which...

jacekd, in this case, can word containing tag containing number of millisecons be used as input for TIM_S5TI? I guess no. S5Time is simply BCD. Once upon a time I had to convert seconds to S5Time (S5-155 CPU948 though) Name :INT->S5T Convert integer seconds to s5t :DUF...

Dear MartinBEng, I would also check the following: Was the upgrade of Step the only action made to PC? I mean, what if it is something IRQ- or Windows- related, like lack of irq numbers or simply lack of HDD space (I noticed that Step7 needs several megs or more to open project). What is...

Dear Rudi, I'm absolutely agree that built-in timestamp datatype should be avoided. One vendor may use 1/jan/1900 as start point, another vendor - year 1980, this is too dependent. I would transfer towards SQL server something like YyyyMmDdHhMmSs string. Almost sure MS SQL Server should be...

Dear Andy32821, it's worth trying to ask ad.support@siemens.com Don't forget to specify CPU model and version, block number of PID block. The more specific you are, the better. You can also try to look through their database (for conversion block)...

Dear MartinBEng, Have you checked what's configured in "Set PG/PC Interface" applet in Control Panel ("S7 Online" access point item)? You can also try Siemens AD free support ad.support@siemens.com, usually very helpful

Dear Fritzfrederix, Could you pls explain the role of WinCC here? Should it submit the data to a database running on separate server? And what date and time is it about? Simply system time of machine on which WinCC is running, or timestamp when a tag was updated, or something else?

Hi, All, Due to corporate rules we invest only in Siemens PLCs. Thus I'm replacing existing and running SLC500 (with SLC 5/03 cpu, couple of digital output boards and couple of digital input boards) with Siemens PLC. From contractor vendor I have hardcopy of plc program, but I'd prefer to read...

Thanks for info. This is a vital task for me as well, because I'd like to have an alternative for my Siemens PG. Could you please drop me a line when you try this solution? Kind regards, "ipupkin"