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I don't think you need stepper motors for this, a DC gear motor should work. Here's a few ideas: Simple case, use a gear motor originally for automotive uses such as a winch, starter, window, or seat motor, connect with chain and sprocket, pulleys with v-belts, or a wheel that contacts the...

I have no experience with this, but I would guess that a laser interferometer system could meet your requirements. Look up Renishaw's XL-80 laser measurement system, for example. http://www.renishaw.com/en/xl-80-laser-measurement-system--8267

Pepperl+Fuchs has HART Loop Converter products [KFD2-HLC] that are functionally similar to Moore Industries' HIM. "Each HLC is able to power and communicate with one HART-field device. It sets the field device into burst mode and converts up to 4 HART-variables into analog output signals."

Moore Industries does have a device that could achieve this. their HART Interface Module [HIM], but you would need two of them to communicate with two transmitters. The HIMs can operate as Primary or Secondary HART masters. one could take each role to talk to one of the multi-dropped...

One thing that you can cause this (depending on how the PID block is configured) is the PV value from the transmitter not being received, or the PV value temporarily having a Bad Quality\Status, or possibly also High or Low Limited.

Many transmitters (and other field devices) support the HART communication protocol, which can be used with a "HART modem" [serial interface] and software such as PACTware to obtain readings and other information using a PC.

If you disconnected your DCS from the segment, the 475 could become the LAS, and you could add the TT device's AI block to the schedule in the 475, as you mentioned. However, since you have not changed the schedule in the DCS, when you reconnect the DCS the new AI block will not be...

Function block execution is managed by your DCS (or possibly in a field device acting as LAS [Link Active Scheduler]), the 475 Field Communicator does not have the ability to configure other host devices. You will need to learn about your DCS and its specific configuration tools. (The AI...

I don't think that you will find a device that can simulate a HART slave. A converter such as the Nivelco Unicont PDF may be useful for your needs, it can convert 4-20 mA current values to HART. The 475's simulation feature is only to simulate a device that is not present for itself (the...

Emerson / Rosemount now provides DTMs for many of their transmitters (which can be downloaded at no cost, I believe), see: http://www2.emersonprocess.com/en-US/documentation/deviceinstallkits/Pages/deviceinstallkitsearch.aspx The DTMs should be capable of fully configuring the associated...

David, Thanks for the feedback; it's nice to know that my comments were helpful. As you probably know, there are full-featured DTMs (that can be used with your PACTware setup) from a number of device manufacturers, often available at no cost. The membership directory or the product...

PACTware can certainly be used to communicate with virtually any standard HART devices using the universal and some "Common Practice" commands. Typically PACTware is distributed with the two additional software components that are necessary for this; a HART Communication DTM and a Generic HART...

I think that ultrasonic sensors could be applied with triangulation techniques to solve your problem. Your mother node would need three ultrasonic receivers separated from each other by some distance, the child nodes would transmit a burst of sound which the mother node would detect at each...

James, I believe that you can purchase an iDTM from CodeWrights: http://www.codewrights.biz/joomla/index.php?option=com_content&task=view&id=38&Itemid=82 As they state, "The iDTM interprets HART DDs/EDDs (FOUNDATION Fieldbus and PROFIBUS to follow) and enables the integration of third...

It appears that we are discussing very different things. Technologies like FDT are addressing much more difficult challenges like advanced troubleshooting and diagnostics, instrument management, etc. Standardized basic setup like you describe has been available for about a decade in the...

PACTware is a "frame" or "container" application that supports the Field Device Tool [FDT] interface. FDT essentially partitions the PC-based software system into separate component types, the frame or container application, and device type managers [DTMs] with defined interfaces between...

PACTware and DTMs are based on FDT [Field Device Tool] technology. The FDT standard is entirely open and the specifications are freely available [http://www.fdtgroup.org]. I believe the communication functions [within the Windows environment] use XML and COM components internally. The...

There are universal DTMs that support devices that only have DDs supplied by the manufacturer. It should not be necessary to use some other host system designed to use DDs. For example, CodeWrights offers the iDTM(TM). From http://www.codewrights.biz/ : "The iDTM enables the...

PC, You should probably ensure that you understand what fieldbus features of the device from manufacturer 'A' you are actually using (and need), to ensure that a device from another manufacturer has those features (in particular, the function blocks that connect to other parts of your control...