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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...

1) Can I suggest that you Google "generator Modbus manual" so can see what your competitors have done as an example. Imitation is the sincerest form of flattery. 2) Since Control.com contributor Mr. Linse is too shy to proffer his suggestions for Modbus slave design, I'll offer it on his...

> write for example a setpoint or PowerSupply ON command, which address I should use for these values? No one here knows because you haven't said which Modbus slave device you are working with. Each is unique. The address to which you write a setpoint or Powersupply ON command is defined...

Those single loop controllers can have different devices for their outputs, a relay, a solid state relay, a triac or even a DC voltage or current; it depends on the model. In the configuration, if it says rLY under "Option 1 (or Option 2 or Option 3) module type", then the output device on...

Any device using Modbus will have a hardware comm port (RS-232/RS-485/Ethernet) and that comm port will have the correct voltage needed for its specified operation.

> Is there any solution beside change the sensor to higher range? No. The capillary fill fluid presses on the low side (upper) sensor diaphragm applying a 'static' positive pressure and the fill fluid pulls away from the high side (lower) sensor diaphragm applying a static negative pressure...

It sounds like a single ended PLC AI card. Good luck. I assume that the 'PLC common' is the (-) side of all the analog inputs? Whether there's a ground loop will depend on the isolation provided by the 3 or 4 wire devices; most all loop powered 2 wire devices are isolated. If it were...