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Check out the Foundation Fieldbus simulation and loop check functions in this thread: http://control.com/thread/1339741451

install pdf print driver: http://plcforum.uz.ua/viewtopic.php?f=14&t=18768

I just stumbled across a scanned copy of HART Field Communications Protocol, A Technical Overview, 2nd Edition, 1999 on Rosemount's site, of all places. It's about 90 pages long and has lots of specs...

The wiring: P/S (+) > xmtr (+) xmtr (-) > Wago #1 IN+ Wago #2 (GND 1) > P/S (-) Wago #5 > Siemens (+) Wago #6 > Siemens ground/common You need to put a current milliamp meter in series in the Wago output and see if the Wago is providing an output. Test your meter first on a known...

1) Did you check the code in model part number on the stainless ID label to confirm that the transmitter is HART and not DE? HART does not communicate with a DE transmitter. Honeywell HART transmitters were shipped from the factory with Blue colored screw covers, but the tan/brown/beige...

> did i understand correctly? Yes.

Most paperless recorders can do 10 updates per second; Honeywell, Yokogawa, Eurotherm, ABB. Recorders take generic DC signals, like 0-1Vdc or 0-5Vdc. So you'd need a frequency to DC converter. If the frequency signal voltage is in the range of 25mV to 2.5V Dc, then something like this...

The spec sheet for the Wago 857-451 says, "The 1-channel passive isolator filters and electrically isolates 0(4) 20 mA analog standard signals, while drawing power for signal transmission from the input circuit. The connected sensor supplies the passive isolator with the required power, while...

The feature/action that you are looking for is called 'proof-of-closure'. You can Google for vendors and models. This link goes to a solenoid valve with a proof-of-closure switch: https://www.ascovalve.com/Common/PDFFiles/Product/8043R3.pdf

Once data is available in Modbus, it is available via OPC. Ignition is an OPC Client and either uses an integrated OPC server or a 'freestanding' OPC server that's been installed and configured. Any commercial OPC server can be equipped with a driver to fetch data from a Modbus device...

> How it will show DP if both HP and LP connections are taken after suction filter? It's doing what it's been installed to do - showing you the DP between the tapping points, 2-3mmwc, which sounds about right, depending on far apart the taps are. Unfortunately, that's a useless measurement...

> Can't we just increase the loop voltage and connect all in the same loop? Sometimes it works to run two loads (analog inputs, AI) in series in a loop, but many it doesn't work. When it doesn't work it's because there can be multiple grounds between the power supply, and the multiple...

The impulse tubing/piping is backwards with respect to the ports on the transmitter. The upstream side of the filter connects to the high side of the transmitter. The downstream side of the filter connects to the low side of the transmitter. When the plumbing is backwards, the differential...

I'm wondering if the earth grounded negative of the power supply creates a ground loop with the (-) side of the AI card due to a change in ground potential when plant is running, effectively creating an offset in spite of the loop isolator. If the power supply earth ground connection to the...

The Alibaba link required registration, so I passed. The Datanab I/O module looks very well designed for high level analog signals (no T/C or RTD temp sensors). I doubt the inputs are isolated at that price point; if they were, the spec sheet would brag about it. The spec is silent on the...

I don't know why a slave device would quit running. I've run a licensed version of Modscan32 for over a decade, so I can't remember what happened when it expired when run in demo mode. It sounds like you were running a demo version and it closed on you. I don't know whether there's a time...

You want me to duplicate what Yokogawa has already tackled? Really? Given your age, the first thing you're expected to do is to try Youtube. Youtube results are likely to be all over the usefulness map, but so are Google hits. Give it a shot and see what you find. The ultimate method...

Answer - get the manual, software and modem needed to talk to the multivariable. Several years ago, I checked a DP measurement on a multivariable to see if it needed trim. I recall that I needed the mfg software and modem, but it was straightforward - open ports for zero, applying span...

2 wire, loop powered heavy duty industrial pressure transmitters are always isolated at the transmitter and are typically not the devices that need a loop isolator. 3 wire and 4 wire devices frequently need an isolator in the loop to break a ground loop. However, a junction box with water or...

A PLC AO could drive a - I/P to a pneumatic actuator for a control valve or damper - positioner to a pneumatic actuator for a control valve or damper - Electric actuator for control valve or damper - VFD that drives the motor that drives the pump/conveyor/whatever - SCR/thyristor...