Search results

1) Going back to your original post, >I don't know the slave address for this device. The slave address is called CodE in the serial setup section, as shown in the image from the manual: https://s27.postimg.org/ecrk61zc3/Modbus_slave_ID.jpg Slave address should not be zero. 2) For...

You can use an image sharing site like Postimage.org and then post the "Direct link"

The present day spec for drift-over-time is so good that I probably wouldn't bother checking. I'd assume the performance is more than adequate after the range change. But it's your call. Someone has already re-ranged the transmitter from 0-100m3/hr to 0-200m3/hr, so you don't call re-ranging...

Automation Direct is a web based vendor of PLCs and associated components and controls. They publish a 93 page text called Automation 101: Control System Engineering, A Condensed Guide to Automation Control, System Specification, Design and Installation It's a free download. I suspect you...

1) There's a setting, SEr.P in the controller to select either the Modbus RTU protocol or Cencal Gefran protocol. Are you sure you've selected Modbus RTU? 2) It isn't clear whether those zeros are real traffic or fillers in the program you're using. If you are not getting any response...

Apparently, the Energy Meter (EM) register addresses polled by the charge controller (the Modbus master) are configured via web browser connected to the charge controller. The EM (Energy Meter) configuration is accessed from a button labeled EM Config on the Energy tab page in the web...

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...