USAMED-20MS2T通讯网卡模块现货供应物美价优

USAMED-20MS2T通讯网卡模块现货供应物美价优
USAMED-20MS2T通讯网卡模块现货供应物美价优



二、输出回路的设计
1、各种输出方式之间的比较
（1）继电器输出：
优点是不同公共点之间可带不同的交、直流负载，且电压也可不同，带负载电流可达2A／点；但继电器输出方式不适用于高频动作的负载，这是由继电器的寿命决 定的。其寿命随带负载电流的增加而减少，一般在几十万次至Jl百万次之间，有的公司产品可达1000万次以上，响应时间为10ms。
（2）晶闸管输出：
带负载能力为0.2A/点，只能带交流负载，可适应高频动作，响应时间为1ms。
（3）晶体管输出：
优点是适应于高频动作，响应时间短，一般为0.2ms左右，但它只能带 DC 5—30V的负载，输出负载电流为0．5A/点，但每4点不得大于0.8A。
当你的系统输出频率为每分钟6次以下时，应继电器输出，因其电路设计简单，抗干扰和带负载能力强。当频率为10次／min以下时，既可采用继电器输出方式；也可采用PLC输出驱动达林顿三极管（5—10A），再驱动负载，可大大减小。
2、抗干扰与外部互锁当 PLC输出带感性负载，负载断电时会对PLC的输出造成浪涌电流的冲击，为此，对直流感性负载应在其旁边并接续流二极管，对交流感性负载应并接浪涌吸收电 路，可有效保护PLC。当两个物理量的输出在PLC内部已进行软件互锁后，在PLC的外部也应进行互锁，以加强系统的可靠性。
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