Search results

You haven't told us what kind of signal is coming from the level transmitter (presumably 4-20mA), nor how the level transmitter gets its power, nor how the original wiring which "shares" one signal between two PLC analog inputs was accomplished; all of could play a role in a missing signal...

Lots to choose from: http://tinyurl.com/pgakocf

You need a signal conditioner module to produce a useable signal for PLC (4-20mA) and to isolate the isolate the PLC from the relatively high voltage. Here's a link to a signal converter that handles inputs up to 1000 Vac. http://tinyurl.com/pk6mhgg I do not understand what "per unit"...

If it operates as just a flow meter and totalizer, presumably it operates unattended. Someone just looks at the display. If it operates as a batch controller, then the sequence of steps to enter a preset (target batch size), pause and resume, or abort can be of interest because the simpler...

> Would a Modbus server with register greater than 16 bits be useable? No, It would be a mis-representation to call your addressing scheme 'Modbus'. In answer to the thread title, "How Strictly Should the MODBUS Addressing and Data Models Be Followed?" my answer is to the letter. Some...

> LP is no angle, HP is angled. just remember where the medium is coming from. its the HP. I agree that the HP side is on the side "the medium comes from", what I call the upstream side. But I have to disagree on which side is which. On every concentric OP I've encountered, the...

The asterisk *2 on the DVP06XA-S wiring diagram means 'note 2', which says,"If input signal is in current, please short out between V+ and I+ terminals". So jumper V+ to I+ on the analog input channel. Connect your (+) analog input V(+)/I(+) terminals to the I/P terminal 1 brown wire 24Vdc...

The SMC ITV 2050-043BL4 is an I/P transducer. The digit '4' in the part number is for the 'Monitor output' feedback signal, a 4-20mA current signal, described as 'sinking' [page 12 pdf] The current monitor feedback signal positive is the cordset brown wire (M12 terminal 1) connected to the...

Thank you for posting your solution. It really helps who find this thread to see what the solution was.

Tony Kuphaldt's massive tome on instrumentation, "Lessons In Industrial Instrumentation, version 2.01" from www.ibiblio.org/kuphaldt/socratic/sinst/book/liii.pdf

Ideally, yes, but . . . . A load cell is ratiometric, that is, its output is proportional to the power supply voltage. So the output is linear taking into account the stability of the power supply and all the expected uncertainty factors: linearity, hysteresis, temp variations, and where...

Modbus is not plug-and-play even if Emerson's laughable marketing spiel, "Plug your Serial Interface into any available slot in the I/O interface carrier, connect the third - party device, power up and play", tries to claim it is. Modbus is a project. Congratulations, you're the project...

If you get a high mV reading across the thermocouple wires, then - moving the wires to make the reading changed the possible shorting problem - the analog input has a problem such that it cannot deal with the mV signal - there is a ground loop of varying intensity, but with a polarity...

A drop to 100 is indicative of a short creating a false junction. A drop to zero is indicative of a burn-out, open circuit condition with the burn-out direction set to 'low'. Not sure if you have both situations or not.

Somewhere between the hot junction and the analog input there's a short circuit in the extension lead wire or on a terminal block where the thermocouple connects that connects the thermocouple (+) lead to the thermocouple (-) lead. It could be extension wire whose insulation was...

Mr. Fawzy, That's a very interesting observation. A common for all channels is what allows common mode voltage to affect the signals like you've seen. Most likely, the multiplexor is not individual relays, but solid state with a common for all channels. Having a common connection between...

Recently there was an unresolved thread involving the same model Yokogawa AI, here http://www.control.com/thread/1409872242 Offsets can be indicative of a ground loop/common mode issue. But, the Pyromation 440 is an RTD input, and RTDs are inherently isolated sensors, and it's a 2 wire...

Yes. 12-117 in wc.

> "flow meter data is less compared to other flowmeters" other flowmeters? When you run multiple pumps through multiple flow meters to fill a common reservoir, then each pipe with its flowmeter will contribute a fraction of total. 1400 m3 is a fraction of 2500 m3. The other flowmeter...

Given the nature of what you've reported thus far, I can't predict what will happen if you connect a single AO to a single DCS card. It does not sound at all like expected operation of isolated devices. Three other thoughts: 1) Any junction boxes/marshalling terminals in between the Adam...