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It is common knowledge that heat kills electrical/electronic components. ASCO's white paper http://www.asco.com/ASCO%20Asset%20Library/asco-optimizing-power-management-white-paper.pdf#search=coil%20life%20expectancy on power consumption and the heat it produces explains the impact...

Wayne Ulanski can spelled it out pretty well: http://www.svf.net/resources/How_to_Select_Automation_Accessories_for_Valves.pdf

Origin of 'impulse line' Yes, your connection impulse with physic's force is along the right path. I've actually wondered why and when the term was used too, and I'm a native English speaker. So I got out some old and older books to see when impulse line was used. The 1989 edition of the...

I am unaware of wiring crimp ferrules made of thermocouple alloys. That's not to say that such a product isn't out there, but I haven't seen it. I suspect that the market is not large enough to warrant producing them. If you were to use conventional ferrules, designed for copper wire, the...

If the tank has a mix of something and water then non-contact radar might avoid the situation described in the report at this link: https://www.norskoljeoggass.no/Global/Prosjekt%20HC-lekkasjer/Faktaark/Faktaark%202014/Fact%20sheet%202014-H_Final.pdf The condensate overflowed into the...

See my post, the last one in this thread, here: http://control.com/thread/1411750426#1411826356l Ignore the first sentence and start at "Modbus is a project. Congratulations, you're the project engineer!" Your HNC TP2507, the HMI, will be the Modbus RTU master. Wherever the post refers to...

Your response: 01 95 04 4E 93 decodes 01 = slave address/ID 95 = Function Code 15 with MSB leading bit set to a logic one (the high order nibble 0001 with the MSB set to one is 1001 or hex 9) 04 (04 hex) exception error for Slave Device Failure: The Modbus spec says, "An unrecoverable...

I do wired serial but not FO and I'm not an IT guy so I don't even know what a "rollover to a Cisco" is. But by your own admission you have all the means of doing troubleshooting by substitution, to whit, "This configuration worked fine in my lab with just a 10 meter fiber patch cord between the...

Thank you for explaining how you fixed the problem which was a somewhat hidden roadblock. That kind of follow-up is valuable to those who find threads like this in Google search.

The world is full of solenoid valves and their coils, from dozens of vendors, in literally, thousands, if not tens of thousands, of models with different specifications, so the answer is it depends on the specs for that specific coil. Most solenoid coils are rated at a specific voltage and...

Can you extend the timeout period in the master? It should not slow the throughput/replies from the other devices, but might allow enough time for the echart to reply. Maybe echart is overwhelmed with calculations and can't get around to servicing the com port. >The challenge is with echart...

Thank you for reporting back what the hidden road block was that prevented writing to an AO point.

Yes, my statement agrees with the manual. If you want to read/fetch analog output values, then you use Function Code 3 to read (4)0576 - (4)0767. If you want to write to the analog output registers, then you use Function Code 16 (FC16 decimal, FC10 hex) to write the values to Holding...

Address 30585 is a Modbus Input address/register. An analog output value will not likely to be in an 'input register' (by convention), but will be in a Holding Register in the 4xxxx address block. Function code 04 fetches Input registers at 3xxxx Function code 03 fetches Holding...

RS-485 is just a transport mechanism for binary bits. Any number of protocols, sets of rules for communication and how data is packed can run over RS-485. I seriously doubt that the communications protocol is Modbus, therefore, using a Modbus master utility won't do anything. A Google...

5167 uses differential pressure for flow calulation. So the use of an absolute pressure transmitter says that a flow computer is being used to convert from volumetric flow to mass flow with temperature and static pressure compensation. Mass flow static pressure uses absolute units.

I opened the catalog of a T/C vendor and found a limit of error table for extension wire. https://s15.postimg.org/6gpczedln/Limits_of_error_for_extension_wire.jpg It appears that the standard limit of error for K wire is the same value as standard limit of error for thermocouple wire, but...

You don't say how "does not work" manifests itself - Master times out? Exception code? Whole network comes down when you add #7? What exactly happens when you add #7? Error log messages? But, if #7 works OK stand-alone then you know how to wire it and poll it. Did you leave the...

> I can poll both HP and HVAC and get values. If you get VALID values from each device, then the physical RS-485 network connection is functioning. 1) Why the "response not from expected slave" error? If you're getting valid data from each, then it isn't clear how the slave ID's could...

Get a standalone Honeywell UDC2500 PID controller with its SP Rate setting with separate Engineering units rate UP and Engineering units rate DOWN settings. https://i.postimg.cc/SRNp7K8C/01-SP-Rate-and-EU-per-hour.jpg Talk to it via Modbus for SP and PV.