The QScreen Controller combines an embedded computer based on the 68HC11 microcontroller with a touch panel and LCD (liquid crystal display) graphic user interface (GUI) that is ideal for instrument control and automation. Flexible and rigid cables or bars for power transport can be installed in a power panel. In a three-phase system, instruments can be installed that measure the single electrical parameter, one per phase, or a voltmeter and a current can be installed with the voltage and current switches, allowing the measurements to be displayed in sequence. The plank floor was sectioned out like a house's wooden flooring section, and personnel needed an industrial data acquisition solution capable of reading voltage and connecting to a string pot to read and record its measurements to learn where these separations were and their extent. Choosing an analog instrument ensures good reading stability, due to the mechanical inertia of the needle and the fact that the reader immediately knows whether the instrument is operating normally or if the reading is out of range. Connecting analog instruments is very simple; you just need to connect the phase and neutral cables to the instrument. There are different families of products on the market: instruments which measure a single electrical parameter (voltage, current, frequency, and phase angle cosϕ), generally used in single-phase systems, as instrumentation on the machine, and instruments allowing all the electrical parameters to be measured and displayed, both for the single-phase system and for the three-phase system.

In a single phase system, analog and digital instruments are selected to measure voltage, current, frequency, and power factor. This callback is called only in Modbus slave mode when the slave receives a valid request from a Modbus master to write a single holding register. The master and slave could even exchange ascii QED-Forth operating system commands. The sizing of the measurement system begins with knowing the main parameters of the plant; in particular, from the characteristics of the protection switch, the type of distribution system, the rated current, the rated voltage and the type of busbar can be known. The parameters chosen for a current transformer are not only the rated current, the secondary current and the power, but also the type of assembly. A current transformer suitable for the application must therefore be selected. GSI was planning a troubleshooting application to see the extent to which their grain floor was separating every time their grain bins loaded and unloaded, which was impacting production and storage efficiency. GSI Grain Storage installed a Novus FieldLogger data acquisition system in a grain storage bin that was repeatedly loaded and unloaded into the storage floor area to measure the separation of the floor sections.

The normal way to implement this is with a two wire system with differential signal levels. So, how do I wire my RS485 devices? You have to power up the slaves before the master, since the RS485 master searches for slaves only at startup. With an RS485 interface, the FieldLogger could act as a Modbus RTU master and read registers from other slaves, and as a master, it was able to read and log up to 64 registers from Modbus slaves. A jumper labeled "1 485En" (J4) enables RS485 operation on the Serial1 port if the jumper cap is installed, and configures Serial1 for RS232 operation if the jumper cap is not installed. For RS232 operation: Remove the jumper shunt from J3. When successful this function will also invoke the ModbusMasterReadDiscreteInputsResponseCallback callback. In this callback the Request ID provided by the callback argument must be matched with the Request ID returned from this function to verify that the callback is indeed for a particular request. CAS DataLoggers recently provided the datalogging solution for GSI Grain Storage in Assumption, Illinois, the world's largest manufacturer of steel farm grain bins, commercial storage grain bins and grain silos, as well as grain dryers and material handling systems including grain bin sweeps, spreaders, chain loop systems, commercial bucket elevators and conveyors.

Configuration and data accessibility were a snap: the FieldLogger's user-friendly configurator software was accessible by Ethernet, USB or RS485, and also provided means for online monitoring, downloading of all logged data, and quick exporting to spreadsheets and other formats. The FieldLogger's small 164 x 117 x 70mm dimensions fit easily into the storage bin with plenty of room for the bin's normal load. GSI Grain Storage benefitted in several key ways following installation of the Novus FieldLogger. Use this function for the following case: When the data response from the inverter is too quick after the PC had sent the data to the inverter, PC process cannot get ready to receive the data, or when the USB/RS485, RS485/RS232C con- verter is used, changeover of sending and receiving data takes much time in the converter process. If you liked this report and you would like to get more info regarding rs485 cable kindly pay a visit to our web page. This callback is called only in Modbus master mode when the master receives a valid response of a request to read discrete inputs. The distinction between master and slave is an important one. After the slave transmission is complete, the slave puts itself back into receive mode so that the master can transmit additional commands.

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