PLC最常见10个问题及解决办法

1、通讯故障：PLC与触摸屏/变频器通讯中断，多为线路接触不良、波特率不匹配。解决：检查网线/通讯线接头，确认主从站波特率、站号一致，重启通讯设备。 
1. Communication failure: Communication interruption between PLC and touch screen/frequency converter, mostly due to poor line contact and mismatched baud rate. Solution: Check the Ethernet/communication cable connectors, confirm that the baud rate and station number of the master and slave stations are consistent, and restart the communication equipment. 

2、输入点无信号：传感器触发但PLC输入灯不亮。解决：测量传感器供电，检查接线是否松脱，更换损坏的输入点或传感器。 
2. No signal at input point: sensor triggered but PLC input light not on. Solution: Measure the power supply of the sensor, check if the wiring is loose, and replace damaged input points or sensors. 

3、输出点不动作：PLC输出灯亮但执行器无反应。解决：检测输出回路电源，查看继电器/晶体管输出模块是否损坏，更换故障模块。 
3. Output point inactive: PLC output light is on but the actuator is unresponsive. Solution: Check the power supply of the output circuit, check if the relay/transistor output module is damaged, and replace the faulty module. 

4、程序运行异常：PLC无报错但逻辑不执行。解决：检查程序步序、联锁条件，排查地址重复使用，用监控功能定位未触发的指令。 
4. Program running exception: PLC has no error but logic is not executing. Solution: Check the program sequence and interlocking conditions, investigate address reuse, and use monitoring functions to locate instructions that have not been triggered. 

5、电源故障：PLC无法上电或频繁重启。解决：测量供电电压是否在额定范围，排查电源模块损坏、外部短路，更换电源模块并做好接地。 
5. Power failure: PLC cannot be powered on or restarts frequently. Solution: Measure whether the power supply voltage is within the rated range, check for damage to the power module or external short circuits, replace the power module and ensure proper grounding. 

6、模块报错：PLC面板模块故障灯常亮。解决：断电重新插拔模块，检查模块地址冲突，更换故障模块并重新配置参数。 
6. Module error: The PLC panel module fault light is constantly on. Solution: Power off and re plug the module, check for module address conflicts, replace the faulty module, and reconfigure parameters. 

7、现场信号干扰：模拟量输入波动大、数字量误触发。解决：将信号线与动力线分开布线，做好屏蔽接地，在模拟量输入侧加滤波模块。 
7. On site signal interference: large fluctuations in analog input and false triggering of digital input. Solution: Separate the signal line from the power line, ensure proper shielding and grounding, and add a filtering module on the analog input side. 

8、存储卡故障：程序无法保存或读取失败。解决：检查存储卡是否插紧，格式化损坏存储卡，重新下载程序并备份。 
8. Memory card failure: Program cannot save or read failed. Solution: Check if the storage card is securely inserted, format the damaged storage card, re download the program and backup it. 

9、CPU过载：PLC CPU指示灯闪烁，运行卡顿。解决：简化冗余程序，减少高频扫描指令，优化程序执行周期，关闭无用功能。 
9. CPU overload: The PLC CPU indicator light is flashing and running is stuck. Solution: Simplify redundant programs, reduce high-frequency scanning instructions, optimize program execution cycles, and disable useless functions. 

10、外部执行器故障：PLC输出正常但阀/电机不动作。解决：检查执行器供电和接线，排查执行器自身损坏，更换故障执行器并测试。 
10. External actuator failure: PLC output is normal but valve/motor does not operate. Solution: Check the power supply and wiring of the actuator, identify any damage to the actuator itself, replace the faulty actuator and test it. 

如果您在进行PLC选型，希望售后支持技术给力，可以选择广成科技GCAN-PLC系列，加微信13019325660或前往沈阳广成科技官网具体咨询。 
If you are in the process of PLC selection and want after-sales support technology to be awesome, you can choose GCAN-PLC series of Guangcheng Technology, add WeChat 13019325660 or go to the official website of Shenyang Guangcheng Technology for specific consultation.