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I am not an industrial forensic analyst. these are my thoughts on the situation. 1. Is this quantity of failed positioners a "real" problem, as opposed to ordinary "wear and tear"? What is the total population of positioners vs the number of failures? Could this be just ordinary...

Thank you for the update. It could very help out someone else down the road.

If you aren't 'locked out' but lack the programming resources to access the program, then considering hiring a systems integrator who can modify the program for you. The other drives do not have to be replaced; the programming for them remains the same as it is now. Only the programming for...

The VFD drive is a Modbus slave/server. The register addressing for the vast majority of field device Modbus slave/servers is done at the factory and the table/map is published for all to see and use. Some Modbus slave/servers have custom assignable Modbus registers. Most PLC's fall into...

probably

A couple of thoughts from a brief scan of the manuals. Schneider's FAQ link for the Altivar Modbus map link, an .xlsx file, is http://download.schneider-electric.com/files?p_Doc_Ref=EAV64332 But I find that the all-on-one pdf map is quicker to search...

I have never used function code 43 or even run into it before, but Schneider's Altivar VFD line implements it for Device ID. Schneider provides an example of query and response messages on page 39 of the Altivar Serial Modbus manual at the link below. Maybe it can help you...

Correct, nothing between the 4-20mA output and positioner's input. Any electro-pneumatic positioner (or I/P) is designed to be powered only by the voltage/current provided by direct connection of an 'active' 4-20mA analog output. An active' 4-20mA output is one powered by the output device...

The SRI983 is a Foxboro/Invensys/Schneider electropneumatic positioner. From the description, the I/P coil has failed. What's the failure mode? shorted windings from failed wire insulation? Open circuit? I find it hard to believe that an active 4-20mA analog output can damage a DC force...

Google single loop controller. Match temperature sensor type to what controller can handle Match controller output to valve actuator/positioner input

According to an on-line DSE7420 manual, "The RS485 port can be configured for connection to Cummins MODBUS engines". I don't know if that means the box is a Modbus master or Modbus slave, but whatever it is, it involves configuring the device's DSENet port. The availability of a register table...

Convention says to connect all the drain wires to an instrument ground point on the receiver side, leaving the field side drain wires taped up (so they don't touch ground) and floating.

Assuming - the 12 pair (total of 24) conductors all are the same size conductors, and - the receiver is capable of 3 wire lead wire compensation, and - you use 3 wires for each RTD then you're not likely to have any error above what you'd have if you used triad, 3 conductor cable. Hopefully...

I read it like you do, data word 0000 has the position value in bits 8 -15. If you want to change the position, you need to write to data word 0000 with the new position value in bits 8-15. page 51 states: Master Instructions: Nominal: This variable (Nominal) is the % of opening the user...

The two screen shots you posted are nearly incomprehensible, which is surprising because the 48 page Centork Modbus manual for the Modbus option card is one of the most comprehensive and best written Modbus manuals I've ever seen and the info on the pages you showed are not in that manual...

The spec sheet here http://www.ipsa-cv.com.mx/masoneilan/docs/specdata/Instruments/CW6000.PDF is probably all that there is. It shows the supply air connection, the regulated output connection, the setpoint adjustment and the proportional band adjustment. What else would you need?

The 275 has been retired for years, 2002 (?) or thereabouts. But, hook the 275 up, give it try and see. I suspect that the universal and common commands will still function for any HART device. But the generic commands are fairly limited. I seriously doubt that updates are available any...

There are Alert messages (my terminology) displayed by the bell symbol (upper right) in a pop-up window. Links embedded in those alert messages 404.

Question: "Start a Conversation" Where does the conversation show up? Does it show up in public in some "Conversation" category somewhere? Or is it a private message to a registered user?