Search results

Deadband, You don't calculate what a pressure switch (non-adjustable) deadband is. The (non-adjustable) deadband is what it is for any given pressure switch, due to design and mechanical tolerances. Every major manufacturer lists the deadband range for a given switch. Two identical pressure...

Did the 1st meter work properly? For how long? Why was the 1st meter replaced? Were the three values available from the 1st meter before it was replaced? 1st energy meter: manufacturer? Model? 2nd energy meter: manufacturer? Model? What happens when the controller polls for...

I've used the UDC's so I have some familiarity with them, but I don't have Labview, I've never used it. So you're on your own, but NI does have user forums. I scan read the NI tutorial http://www.ni.com/tutorial/13911/en/ which shows - using reading a Boolean for a coil (pushbutton) -...

Oops. My mistake. (4)0069 is the read-only working SP. Can't write to that register. Write a floating point value to the working SP at (4)0121, 0078h https://s29.postimg.org/nax4xhc0n/Write_FP_SP_to_4_0121.jpg

I'll bet you took the register address from the UDC 3200 product manual, which is absolutely unuseable - that Modbus map and those register/addresses are for FC20/21 configuration settings. Nothing in the product manual applies to ordinary day-to-day user Modbus. Use the Modbus RTU Serial...

The EJA110E is 'just' a DP transmitter. It does not do absolute static pressure or temperature compensation. >Is P-T compensation mandatory to get output & display in kg/hr? If you want a real inferred mass flow, yes. Some people 'assume' static pressure and temperature and interpret the...

You need to confirm that the UDC's Ethernet card is a)Enabled b)Actually has an IP address of 10.100.0.2 Do this by pinging the UDC from your PC. 1) Change your PC to the 10.100.0.x subnet, with an IP address like 10.100.0.5: (Windows 7) Control Panel > Networking and...

reza_Hdr, It's common and accepted practice on a forum like this to continue a thread once a thread is started on a particular topic. That way, everybody's replies all show up in one thread. Forum threads frequently come up in internet searches, so discussions benefit not only for the...

Yes, I've done it. The UDC works and works fairly reliably for PV/SP/Output reads and the occasional setpoint write. Most variables are mapped to both integer and Floating Point (FP) registers. The setup allows one to choose an FP format on the controller (the two common FP formats are FP B...

Given that all major vendor field transmitters have their own brand limits for low-scale and high-scale fail-safe values, but, to my knowledge they all also offer NAMUR 43 limit values, as shown in the graphic at the link below...

You might want to review what National Instruments has for a Labview Modbus tutorial and an Introduction to Modbus (Google is your friend) Connect Labview (master) to a PLC http://www.ni.com/tutorial/13911/en/ NI Introduction to Modbus http://www.ni.com/white-paper/7675/en/ Modbus...

2000 feet (1000 out and back) of wire drops something. 2000 ft of 18g is 26ohms; 20g is 42ohms; 22g 66 ohms. 50 ohms drops 1 volt at 20mA. So 20g drops a little less than a volt, 18g a little more than a volt. The 3051 has a 10.5V lift-off spec (minimum voltage to power the transmitter). The...

If your question is what should the transmitter range be given that the process range is 0-200°C, allow for high end margin, like 0-250 or 0-300, given that most processes don't run near 0°C, but someone very likely will want to see overshoot or over temperature conditions. Round numbers...

1) See this thread for comments on auto slave detection: http://control.com/thread/1442583080#1442583080 2) This question on Function Code 17 was never answered, probably because most master/client vendors to not support FC 17, nor so the slave/server vendors...

I wish the ISA monthly magazines from the 1950's, 1960' and 1970's were digitized and on-line; I'd love to flip through them, admiring the technology from yesteryear. But they aren't, so access in using those to research this topic is limited. I did find a book published in 1974 that uses...

Youtubes: mechanical installation on a linear (reciprocating) valve adjustment of the turnbuckle on a linear valve mechanical installation on a rotary valve: Configuration of SVI-2AP with HART 475

Back in college days, I had part time job at Data General testing Nova minicomputers. The diagnostic test program (loaded from paper punch tape) was referred to as the Exerciser. There were version updates as it was de-bugged and improved over time. A year or two later, I watched saw a DEC...

Half the old gasket stuck to either the body or the bonnet? Does the stem move freely? Which valve is it? The Samson 3277 is an actuator, not a valve model number. What's the valve model number?

Thank you, Glen, for posting the photos on a public site. I counted 16 of them.

Sure you can calculate velocity by measuring the elapsed time over a known distance between the optical sensors. There are commercial laser distance sensors that continuously update distance via an analog output. That's not a velocity value directly, but can be calculated if the sampling is...