I have encountered such a problem in a project. One of the weighing data is displayed as 32767 in the program monitoring, but the current is normal when measured with a multimeter. The wiring method of the line is such that the Siemens S7-300 analog module adopts four-wire 4-20 mA, the signal is taken from the current output of the weighing display controller, and the weighing display controller is connected by a four-in-one-out compensation junction box. Four load cells and weighing system equipment are used in Central South Electronics, as shown below: Later, under my insistence, the manufacturer agreed to check the weighing system. We first checked the line from the weighing control display to the compensation junction box, the line was normal, and then checked the four load cells to compensate the junction box, and finally found The problem is that one of the load cell's lines has a short circuit, so the sensor is opened and only three other jobs are used, and the template fault is eliminated. Although the last problem was solved, it has not been understood how the template crossed the fault detected by the weighing control display.
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Troubleshooting process: 1. Replace the analog module channel and check if there is any problem with the channel. After the replacement, the problem remains, and the reason for the channel is excluded. 2. Replace the weighing control display to the template circuit. The weighing control display is installed in the instrument cabinet next to the plc cabinet. From the weighing control display to the template, it belongs to the cabinet line. Although it has not checked the problem, it is replaced. After the above two steps, the problem remains, now the weighing control display is left, but the display of the weighing control display is normal, the output signal is also normal, the manufacturer has always stressed that the device is no problem, so there is no clue at the moment.
