Q1: The PC shows that it is currently offline and cannot connect to the PLC?
A1:
This situation is mainly due to the following reasons:
1. The user has modified the communication parameters of the PORT1 port on the PLC (do not modify the communication parameters of the PORT1 port at will, otherwise it will cause your PC and PLC to fail to connect);
2. The USB-to-serial driver software is installed incorrectly or the performance of the USB-to-serial cable is not good;
3. The PORT1 communication port of PLC is damaged;
4. It is not the XVP download communication cable dedicated by Xinje Company.
1. First of all, please confirm whether the communication line connecting the PC and PLC is the XVP line dedicated by Xinjie Company, if not, please replace it with the dedicated XVP communication line by Xinjie Company;
2. If it is confirmed that the connection cable is the XVP cable dedicated by Xinje Company and USB conversion is used, you can find a desktop computer with a 9-pin serial port to try to connect to the PLC. If it can be connected to the desktop computer normally, please replace it. USB-to-serial cable with better performance or reinstall USB-to-serial driver software;
3. If the PLC and the desktop computer cannot be connected normally, you can stop the PLC through the "power on to stop the PLC" function, and restore the PLC to the factory settings at the same time;
4. If the PLC system is updated through a desktop computer with a 9-pin serial port, if the system update is unsuccessful or cannot be updated, the communication port of the PLC is very likely to be damaged. Please contact the agent and the manufacturer directly.
Q2: Why does the output point keep flashing when the ALT instruction is used to control the output?
A2: For ALT and many arithmetic instructions, as long as the conditions are met (such as: a normally open normally flashing coil as the trigger condition), each scan cycle will be executed once, so when using these instructions, it is best to use the rising edge as the trigger condition. Falling edge.
Q3: Why sometimes the PLC coil M and output terminal Y cannot be output?
A3: There are two main ways to output: 1. Use OUT instruction to output; 2. Use SET instruction to output. After the SET instruction outputs the coil position or Y port, the coil will keep the output state if it is not reset (RST).
Generally, in the program, only one output mode can be used for the same coil M or output terminal Y. If the two output modes are mixed together at the same time, there will be no output.
Q4: Regarding the detection and replacement of the button battery on the CPU board in the PLC?
A4: The rated voltage of the button battery is 3V. You can measure the voltage of the button battery with a multimeter to determine whether the button battery is a little bit; when the PLC's power-off holding register is re-powered after a power failure, the value inside becomes very large. Generally speaking, it is very likely that the buttons of the PLC are out of power; if the battery is out of power, you need to send it back to the company to replace the battery.
Q5: Communication problem with configuration software?
A5: If you can directly select Xinje XC series PLC in the configuration software, you can directly configure it in order; if you cannot directly select Xinje XC series PLC, you should select MODBUS-RTU communication mode and communicate through RS485 port. , Please refer to Chapter 7 "Communication Function" of Xinje XC Programmable Control User Manual for specific parameter settings. When setting specific addresses, you must follow the "PLC Device Number and MODBUS Address Number Correspondence Table" in the user manual.
Q6: MODBUS communication problem?
A6: First of all, please make sure that the A and B terminals on the PLC are correctly connected to the RS485 communication terminals of other devices. If you want to modify the parameters of the PORT2 port of the PLC, please modify the register FD8220 directly during data monitoring.
Please make sure that the communication parameters of the PLC and the communication device are the same. The communication parameters of the PLC are set in FD8221. After the parameters are set, power off the PLC and power on again.
The communication parameter settings of different devices are generally different. Please be sure to select the frequency setting method of the communication device correctly, and figure out the corresponding MODBUS communication address and function code. Some communication devices need to be given a running signal before displaying the set frequency.
Q7: Problems with three indicator lights (PWR/PUN/ERR) of XC series PLC
A7:
Q8: Why does the output point output abnormally after the equipment has been running for a period of time?
A8: It may be that the terminal base of the output terminal is loose and the contact is poor. Check whether the wiring or the detachable terminal is loose.
Q9: Why the power indicator of the expansion module is on, but it can't work?
A9: It may be due to the poor contact between the plug-in strip of the module and the pins of the PLC or the problem of the host. Make sure that the connection between the host and the expansion machine is not loose, and confirm the problem of the host or the expansion machine by cross-comparison.
Q10: Why can't I see the corresponding register for high-speed counting when I connect the high-speed pulse to the PLC's high-speed counting input terminal?
A10: If you want to perform high-speed counting, in addition to connecting high-speed pulses to the PLC high-speed counting input terminal, you must also write the corresponding high-speed counting program with function instructions.
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