描述
使该定时器清零，说明这一对象的运行程序正常；否则，属运行不正常，发出报警信号或停机信号。监控程序的梯形图如图7所示。图7中定时器T1为检测元件，X001为控制对象动作信号，X002为动作完成信号，M2为报警或停机信号。假设被控对象的运行程序完成一次循环需要50s
Marconi Fore Systems HE622 ATM Controller Adapter Card
Dell PowerConnect 6024 24 Gigabit Ethernet Ports
Orion D3202P AC-DC, Dual Redundant, ATX Power Supplies
Crestron CNMSX-Pro Professional Control Processor
National Instruments PXI-8422 RS-232 Serial Interface
