The old-fashioned amplifying boards in the workshop are the most annoying. Even a slight interference from the frequency converter causes the weight signal of the PLC to fluctuate wildly and it's impossible to adjust it accurately. Switching to the Allen Bradley 21771-QRD makes things much more reliable. Just connect a 24V power supply and it can start working. The background noise is all blocked by it. This metal block has no screen size to look at, but the terminal block has a flip cover. Even with oily hands, you can still tighten the wires without getting dirty inside. If you need the equipment to be operational urgently, Hanyite Automation Technology is the right place to go. There are always brand new stock items in the warehouse, and you can just pull the wires along the terminal block and power it on to use directly. There's no need to waste time doing nothing.
When running belt scales or quantitative feeders in the workshop, the analog signals received by the PLC at the bottom always fluctuate. The debugging technicians, after spending a long time inspecting the terminal block, still can't pinpoint the cause. Most likely, something has gone wrong in the front-end signal processing section. This module is specifically designed to deal with such on-site interference. Allen Bradley 21771-QRD can perform front-end isolation and amplification on the weak weight signals transmitted by the sensors, and then feed them neatly to the analog input ports of the PLC, eliminating the hassle of manually adding filtering algorithms in the program later.
In old factories, during summer, dust and moisture are heavy. Some plastic-shell modules will become brittle after being used for two years, and even a slight bump will cause them to crack and expose the internal boards. The Allen Bradley 21771-QRD with a metal shell makes people feel much more at ease in such an environment. Even if the sealing strip of the electrical cabinet door ages and leaks dust, the dust won't get into the core circuit board. Sometimes during cleaning in the workshop, compressed air is used to blow, and the airflow carries iron filings everywhere. When hitting this shell, it just leaves a white spot, unlike inferior modules that will be punctured by the shell and cause a short circuit and burnout.
Previously, when replacing sensors or adjusting the zero point of the scale on the production line, we had to first power off the PLC, disconnect the wires, and then use a multimeter to gradually adjust the potentiometer. Just dealing with the signals alone would take up most of the day. Now with this device, we can simply toggle a few switches on the side of the module to make rough adjustments to the zero point and range. The PLC doesn't need to be powered off. The parameters in the formula can smoothly transition. In case of emergency repairs, there's no need to consult the thick English manual. The maintenance worker can simply connect the wires according to the simple diagram on the terminal cover, power it on, and directly input the data into the system, eliminating the time-consuming process of repeatedly calibrating.
| Terminal Box: | The terminal block is made wide and has a transparent cover. Even if the on-site electricians wear thick gloves and screw the screws, they won't touch the adjacent wires. Even if the wiring is a bit messy, Allen Bradley 21771-QRD can still fit. |
| Core Board: | It integrates an isolation transformer, which directly blocks the messy and miscellaneous noise from the site and prevents it from flowing along the signal lines into the PLC host. |
| Exterior Frame: | The cast aluminum shell is relatively thick and heavy in hand. The clamping force of the track fasteners is very strong. Even if it is placed next to a large contactor in the electrical cabinet, it won't shake loose. |
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