The GE RX3i has HART pass-through. The S7-1200 PLC accepts a logic 1 signal with a minimum of 15 VDC up to its rated voltage level (24 VDC). Some high end meters allow you to adjust the K factor in the meter, the higher end meter input cards also have K factor adjustments. 
In cases when the sensors signal is changing faster than the CPU cycle, configuring the digital input channel to interrupt the CPU cycle is needed. 
The E+H Promass 83 has HART communication. Pulsed output flow meters can be integrated into measuring / dispensing systems. MrPLC.com 
I'm not familiar with all those flowmeters but many have an open collector output for pulses with the one leg tied to the flowmeter common and will in fact need a pull-up resistor to work properly. Coriolis and some marketers can totalize in the meter and drive a DO to signal when the volumetric is met. I have done some testing with a frequency generator and was able to read upto 9000 pulses/sec using an Event Input Interupt and a input filter of 25us. So if you were looking for gallons and the meter pulse represented 0.01 gals/pulse, the K factor would be 0.01, so if you had 100 counts, divided by the K factor, would be 1gallon of flow. It could happen that impulses are converted to real values and then added to totalizer. so how to get the signal of I0.0 to MD10. MD10 :- Memory word for final output (L/H) of flow meter, MD18:- Memory word for final output (L/Sec) of flow meter. We promise not to spam you. An analogue signal will give you instantaneous flow rate - if coming directly from the flow transmitter.
I'm sure it varies based mainly on ID of the flowmeter & various other manufacturing specs. AcroPack Mini PCIe-Based Interface I/O Boards, university power plant steam cost calculations. For flow meters with pulse output, Acromags989EN-4016transmitters are widely used for I&C, remote monitoring, and sub-metering applications. flow pulse meter oval gear pulser output meters lc series Pulse counting is the only way to ge accurate volume measurment, these cards also measure the frequency of the pulses, this can be used for real time flow rates, and in my opinion is just as accurate as the flow rate through an analog input. In AB CompactLogix or ControlLogix you can have an event task that runs when the input goes true, or a fast periodic task, or for a continuous task call the counting routine several times in your main routine. When totalizer value will reach to 5000 liters, then automatically it should be reset or we can reset the value using RESET button. Note: Above logic is for explanation purpose only.
Sign up for a new account in our community. The best practice in this situation is to test the sensors connection using a relay. Press question mark to learn the rest of the keyboard shortcuts. flowmeter outputs drurylandetheatre The industrial grade 993EN-4016 is UL/cUL listed, with typical accuracy of 0.05%. Accordingly, the 989EN-4016 is a versatile, value-priced solution for Ethernet 16-channel discrete I/O with counter/timer in the US market. The K factor should be set from the factory. liquid ftb 304ss omega A popular application ofuniversity power plant steam cost calculationsis achieved by sending pulsed outputs from flow meters to the 989EN, with discrete inputs and signal counters configured to totalize/convert to digital data. The PNP and NPN connections should both be investigated, and the right connection is the connection after which the sensors signal wire can provide the adequate current for the relays coil. Here we moved value of MD22 in MD26 (total fuel in liter) for display purpose. I dont understand that place. Generally speaking for these platforms on a per point cost basis, pulse inputs are about double the cost of an analog input. In the age of energy management for process, manufacturing, and BAS, there is an increasing need for organizations to not only record and manage energy/water usage, but also sub-meter it. Other applications using the 989EN-4016 discrete outputs for limit alarms and control include; water usage sub-metering, liquid filling, and transfer processes. When a steady rotation speed has been reached, the speed is proportional to fluid velocity [2]. Free Instrumentation Course for Trainee Engineers, Single Push button to ON and OFF a Bulb using Ladder Logic. In general I am getting mixed signals from the manuals of the flow meters and the IDEC support technician I was able to get a hold of. The options are many. One for power of the PLC itself and one for power to the valves as well as powering loop power to sensors for pulses(Reading 11vDC). When a liquid flows through the sensor, the turbine blades are subjected to a torque that drives the rotor. In this problem we will consider S7-300 PLC and TIA portal software for programming. Copyright SILVER AUTOMATION INSTRUMENTS LTD. All Rights Reserved. Our flow meter pulse output is too fast for the PLC to catch all the pulses. Why not increase the value of the pulse? Most of the flow meter manufacturers have an additional unit that will change the pulse into a 4-20mA. There are different types of flow sensors, the ones widely used in the industry are [2]: The majority of flow sensor types rely on the principle of flow calculation using the forces produced by the flowing stream. Another vague thing is the information about the connection of the YF-S201 sensor, should it be connected to a Sinking or a sourcing input module? The "K" factor basicly lets the user know how much volume has passeed thru the meter for a given (usually 1) amount of pulses. On a different machine we have some "F/I" converters that are cheap (<$150). pulse flomec flowmeter flujo gpi turbina pulsos In addition, the modules are value-priced for 16-channel energy monitoring Ethernet transmitters. In looking at various paddle wheel type flow meters I notice a lot of them have a pulse type output. Generally speaking the counter value is divided by the K factor. Often a flow meter will require a high speed input card. What frequency of pulses do you anticipate? Perhaps you could change the k factor to something super small, but you'd be losing resolution. That significant of a voltage drop on a power supply is indicative of a bad PS or the 24V is shorted to 0V and or ground somewhere. The speed at which the turbine rotates is detected with the aid of another rotational speed measurement device, a hall effect sensor is used in YF-S201. (n.d.). If a meter reading show +24V across + and -, the problem is in the field. flow meter series proteusind proteus meters switches industries pulse output controller body effect hall plc interfacing easy Then the scaling of the pulses would be adjusted so the plc can read all the pulses. High speed? If total fuel is greater than 5000 (5000 value is for example purpose, it is depended on flow meter configuration & its range ) then totalizer count should be zero automatically or we can reset by pressing RESET button (I0.0). sensor flow plc wiring pull input diagram resistor applications trigger external example The YF-S201 is a pulse-output turbine flow sensor. Figure 2 shows a snapshot of the internal construction of the YF-S201 sensor. I had ran into the same problem, and I concur that HSC is the way to go, or maybe direct module also might work. pulse meter flow output plc station per processes input bits supports controller devices split between output Otherwise, on a lot of flow meters, you can dig into the parameters to setup the pulse width and # pulses/(gpm,lpm, lbpm), and then program into a divide and then add function. Retrieved from Wikipedia: https://en.wikipedia.org/wiki/Flow_measurement, [3] YF-S201 Datasheet. To view or add a comment, sign in. If you disconnected everything and reconnected it would again work for a while then stop.
Dont ever change the K factor in the flow meter. Each channel A/D is 16-bit high-resolution, with a fast 8mS scanning rate of all 16 channels.
Thus, the choice of the supply voltage depends on the logic 1 voltage level accepted by the PLC digital input channel. I've been setting our meters to a pulse width of around 10ms and a pulse value of .5 gallons per pulse. - How would this type of input compare with an analog input (4-20) in price? This is new territory for me so I'm just trying to get up to speed by learning the basics.
website. Hsc is the proper way to do it. If the meter has a MODBUS interface you may be able to write totalizer setpoints, if needed, and then use the meter's digital output to trigger when complete.I've set up truck/rail loading systems using micromotion coriolis meters with there higher end transmitters to do stand alone filling stations. That might get you what you're looking for. The time this doesnt work is if you need exactly the current flow total for dosing or level control. I know the ML has a high speed counter, but I suspect there isn't a frequency register, so for your application analog might be best. You can update your choices at any time in your settings. You'll have to figure out the latency to see if that's viable. Use the built-in totalizer on the Promass and read it with your PLC using HART. You can configure which to trigger a pulse (for example every .25 kg it .5 kg) and the length the pulse to be on. Customers appreciate the user-friendly built-in web browser configuration software tool, along with the ability to remote in over the internet.
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