品牌:西门子SIEMENS | 规格:LGB21.330A27,LGB21.230A27 | 材质:LGB21.330A27,LGB21.230A27 |
产地:德国 |
LGB21.330A27,LGB21.230A27
he LGB... burner controls are used for the startup and supervision of single- or 2-stage gas or gas / oil burners in intermittent operation. Depending on the type of burner control used, the flame is supervised either by an ionization probe, a blue-flame detector QRC1... for forced draft gas / oil burners, or a UV detector QRA... (with auxiliary unit AGQ1...A27).
In connection with the respective adapters, the LGB... burner controls replace their predecessor types LFI7... and LFM1... (also refer to ?Replacement types under Ordering).
为了进一步提高PLC的可靠性,近年来对大型PLC还采用双CPU构成冗余系统,或采用三CPU的表决式系统,这样,即使某个CPU出现故障,整个系统仍能正常运行。
存储器
存放系统软件的存储器称为系统程序存储器。
存放应用软件的存储器称为用户程序存储器。
输入输出接口电路
现场输入接口电路由光耦合电路和微机的输入接口电路,作用是PLC与现场控制的接口界面的输入通道。
现场输出接口电路由输出数据寄存器、选通电路和中断请求电路集成,作用PLC通过现场输出接口电路向现场的执行部件输出相应的控制信号。
功能模块
如计数、定位等功能模块