A-B的PLC5及SLC500内的程序一般不容易丢失，所以故障一般表现为通讯故障和模块故障。A-B的PLC硬件的性能比较稳定，所以干冰线PLC的故障很少，常见一般有以下几种：模拟输入量显示为某一值，不会发生变化，一种情况为开机前出现，遇到这种情况首先看模拟输入模块红灯是否亮起，若亮起则关掉电源对调模块检查模块是否烧坏，若坏了更换之，如果没坏或灯没亮即为数据传输故障或扫描故障，遇到这种情况一般对PLC重新上电即可恢复。另一种为运行中出现，这种情况一般为CPU模块及模拟模块故障，有时重新上电也能恢复，若不能恢复则可能是CPU模块坏了。操作命令没有执行下去，即操作不起作用，这种情况一般有二种可能，一种是该操作应该具备的条件没有满足，所以操作不动。另一种为程序处于自身封闭循环即死循环或扫描时间溢出等造成输出禁止，或者是通讯故障，遇到这种情况可先停止该系统再重新启动，或对该系统进行断电再打到自动并启动即能恢复，若不能恢复则对PLC进行重上电操作一般也能恢复。
PXI-8423
具有64BFIFO、460.8(kb/s)传输速率和光学隔离功能PXI国家仪器公司-8423/2是一个RS-485接口为了PXI。它是一个异步接口，用于通过串行端口与仪器通信。这种型号具有与微软2000、NT、XP、Me和9x的即插即用兼容性。因此，它带来了自动配置的优势，方便安装。该设备可以很容易地从用户当前的应用程序(如Visual Basic、Excel Visual、C++等)安装为标准串行端口。该型号有2端口和4端口两种配置。在双端口配置DB-9中，公连接器与RS232和RS485连接器的标准引脚排列结合在一起。的4端口版本倪PX1-8423配有模块化的10位电话插孔。但是，这些电话插孔可以转换为DB-25或DB-9插头连接器，使用的转换电缆可以单独购买。
PXI-8423
The programs in PLC5 and SLC500 of A-B are generally not easily lost, so faults generally manifest as communication and module failures. The hardware performance of the A-B PLC is relatively stable, so there are few faults in the dry ice line PLC. Generally, there are several types of faults: the analog input is displayed as a certain value and does not change, and one situation occurs before starting up. In this case, first check whether the red light of the analog input module lights up. If it lights up, turn off the power and switch the module to check if it is burned out. If it is damaged, replace it, If it is not broken or the light is not on, it is a data transmission fault or scanning fault. In this case, the PLC can generally be restored by re powering on. Another type occurs during operation, which is usually caused by a malfunction of the CPU module and analog module. Sometimes, it can be restored even after being powered on again. If it cannot be restored, it may be due to a faulty CPU module. If the operation command is not executed, that is, the operation will not work. There are generally two possibilities in this situation. One is that the conditions that the operation should have are not met, so the operation will not be executed. Another type is when the program is in its own closed loop, such as dead loop or scan time overflow, causing output suppression or communication failure. In this case, the system can be stopped and restarted first, or the system can be powered off and then turned to automatic and started to recover. If it cannot be recovered, the PLC can generally be restored by powering on again.
PXI-8423
PXI National Instruments -8423/2 is an RS-485 interface for PXI with 64BFIFO, 460.8 (kb/s) transmission rate, and optical isolation function. It is an asynchronous interface used to communicate with the instrument through a serial port. This model has plug and play compatibility with Microsoft 2000, NT, XP, Me, and 9x. Therefore, it brings the advantage of automatic configuration and easy installation. This device can be easily installed as a standard serial port from the user’s current application program (such as Visual Basic, Excel Visual, C++, etc.). This model comes in two configurations: 2-port and 4-port. In the dual port configuration DB-9, the male connector is combined with the standard pin arrangement of RS232 and RS485 connectors. The 4-port version of Ni PX1-8423 is equipped with a modular 10 bit telephone jack. However, these telephone jacks can be converted into DB-25 or DB-9 plug connectors, and the conversion cables used can be purchased separately.
PXI-8423
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