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1) >What exactly did they do? If you don't know what procedure your co-workers did, how would I or anyone else know? 2) I know you want a 3 sentence summary so I'll take a stab at it, but you should really need to read the 11 pages on calibration in the manual. Otherwise, it's just...

Good Luck. I was threatened with having to implement this about a year ago and was relieved when the project died because their 3 pages on Modbus in the comm manual did not inspire confidence. From notes I have, I believe that the HC2 probe plugs into a Rotronics 'transmitter' that...

The spec sheet on my desk for a Weidmuller 17333230 24Vdc relay says it pulls in at 16.7Vdc. It also gives current and wattage specs. Check the spec sheet on yours.

>firstly open the equalization valve before isolating the HP and LP line from the system <snip> I have created a pressure equilibrium Not true. When the high and low side isolation valves are still open, the differential pressure will create flow path from high side to low side through...

If you search for RS-485 wiring (as opposed to Modbus wiring) you'll find lots of examples and diagrams, like this: https://s32.postimg.org/6k4o02x0l/2_wire_multi_drop_with_terminating_resistors.jpg

If it isn't practical to wire from master to slave 1 to slave 2 to slave 3 in a daisy chain, then your diagram looks OK to me. You understand the concept that RS-485 multidrop is not a hub-and-spoke topology, it's a first-to-second-to-third-to-fourth daisy chain. There should probably...

The absence of an answer in two weeks should be a sign that there probably isn't any cookbook recipe for the task you've got. There is a 28 page document (it looks like the Modbus chapter from a manual) here...

Assuming your register addresses are decimal, please use your CAS Modbus scanner software to read 4 sequential registers 400999, 401000, 401001 and 401002 (decimal) and tell us what their hexadecimal values are. And tell us what the correct value is (should be). If the slave is smart...

Source of total value: Is the source transmitting a flow rate signal or total value? Total Value: generated by internal flow meter calculation or a separate totalizer unit? if separate totalizer, what is the input signal? Transmission medium is: 4-20mA? Modbus? Etherne/IP...

My reply was not clear that I was referring to loop powered digital indicators. Loop powered digital indicators can include a totalizer. These devices do not directly measure flow, they just interpret a 4-20mA loop current signal, in this case from a flow meter, and display one or two...

No, connecting a DC power supply to a loop powered meter will not indicator or totalize or do anything and is likely to damage the meter. A loop powered indicator does NOT regulate the current in a loop like a 2 wire transmitter does. A loop powered indicator uses the loop current and drops...

>if I want to measure (density) in the tank Rosemount sums up how to do it with differential pressure in a 2 page app note: http://www2.emersonprocess.com/siteadmincenter/pm%20rosemount%20documents/00816-0100-3208.pdf

What is HINET software? Licensed with a trial period? Freeware? Are you the developer? I can't seem to find a web site sourcing it.

In order to "power on/off lights" you have to include the PLC on the Modbus network, unless it already communicates to one of the HMIs with another protocol on another comm port. I can't help on the specifics of the HMI configuration/programming, but the rule is that an RS-485 network can...

> role (Auto, Master, Slave) Without a specific context (where the statement comes from and how it used in the document) it's impossible to say what auto is, and even then, it probably would not be clear. It sounds to me like a cut and paste error in a marketing document. The statement...

I don't do turbines or generators, but I've used dielectric grease to coat wire or terminals in outdoor panels, or indoor panels where the building is open to the elements (rolling mill) where changing temperatures and humidity make condensation an issue, or plants with corrosive atmospheres...

You could read what Daniels wrote for a patent application here: https://www.google.com/patents/US20080125916

>It seems to me it is a supplier quality issue and the vendor should > be testing their products across the full rated range. (These > manifolds are rated up to >5000psig) Agreed. Not too long ago I encountered a newly installed gauge pressure transmitter ranged -0.8 atm to +1.0 atm...

http://www.amassdata.com/pcom-rtu.htm "The AMASSER PCOM-SDI/RTU provides an interface between your Modbus RTU master (eg. SCADA, PLC...) and SDI-12 sensors."

Interesting question. There are several discussions of Modbus throughput calculation considerations on control.com: http://www.control.com/thread/956864156 "RS-485 Timing Considerations" http://www.control.com/thread/1397486168 "Modbus Data Transmission Time" Or NWBoson's...