RELANCE 57C404C 通信模块
小修项目
DCS系统小修随机组小修进行，小修项目应包括以下内容：
1) 清理盘柜防尘滤网，检查各种冷却风扇。
2) 电源及模件工作状态检查。
3) 硬件设备功能试验。
4) 消除运行中无法处理的缺陷。
5) 部分就地设备检修;部分I/O模件校验。
6) 机组主保护及联锁试验
根据计算机控制设备特点，DCS除像常规控制设备一样进行外围设备检修外，随机组大小修至少要进行以下项目的检修，即模件组态拷贝，核实控制模件标志和地址;清扫电源、模件及防尘滤网，检查紧固控制柜接线，进行接地系统检查，冷却风扇检修，电源设备检修测试;重要测量和保护信号线路绝缘检查;电子室温度、湿度及含尘量检修前测试，检修后复查;模件电源及冗余模件的切换试验;报警及保护功能测试;通信、手动操作站检查;进行卡进行校验等;检修前要做好充分的准备工作，检修中要严格执行工序卡制度，并认真做好检修记录，对电源、模件等测试要仔细填写测试报告。
Pay attention to the situation where all operating stations are powered off
At this time, check if the power indicator light of the control station is normal, and if there is a fault in the card diagnosis indicator light. The red light and green light indicate that the card is working normally. If all of the above are normal, it can be determined that the control station is working normally and the self adjustment system is working normally. However, the operator cannot see the monitoring screen temporarily and cannot perform remote control operations on site. Immediately notify the microcomputer maintenance personnel to repair and go to the site for monitoring.
Pay attention to the situation where all control stations are powered off
Due to the dual power supply of all control station equipment, one UPS and one mains power supply, the probability of this situation occurring is very low.
When the control station is completely powered off, the two system alarm red lights on the monitoring screen light up, communication is interrupted, and all data is not refreshed. All self regulating systems are completely out of control, and the regulating valve will return to its initial state. The air opening valve will be fully closed, and the air closing valve will be fully open. At this time, emergency handling or parking should be carried out immediately, and the operation should be carried out on-site at the same time.
Observe the power outage situation of the operation station
If some operation stations suddenly do not display, it indicates that the UPS or mains power is cut off, and the microcomputer maintenance worker is immediately notified for repair. If the operating station with electricity can monitor normally, it will not affect the normal adjustment of the control system.