不久前,我公司的一台16t带斗门机的PLC系统发生故障,经诊断,在维修人员替换了系统的一块308-3VA2的通讯接口模块后,系统恢复正常,说明308接口模块存在故障。为此,我们利用“正达”电路维修测试仪对该模块进行了检修。 一、快速测试 首先,采用在线功能第一项快速测试的方法(也称盲测),对电路板上的IC芯片一一进行测试,经过测试,该模块上的四十几片IC芯片,有6、7片未能通过测试。用该项功能测试能通 Not long ago, a 16t PLC system of our company with a door machine failed. After diagnosis, the system returned to normal after the maintenance staff replaced a 308-3VA2 communication interface module of the system, indicating that the 308 interface module is faulty. To this end, we use the “up to” circuit repair tester for the module overhaul. First, the rapid test First of all, using the online method of the first fast test (also known as blind test), the IC on the circuit board one by one test, after testing, the module on the 40 chips, there are 6,7 pieces failed to pass the test. With this function test can pass