描述
延时控制通常应用在开关量控制的场合,当一个开关状态变化时(比如由开变关时),控制器的输出动作要延时一段时间才会给出。比如,在生产线常用的接近开关,当工件就位时,接近开关给出信号,下一个滚筒由于和接近开关安装的位置有一段距离,所以通常要延迟几秒才开始滚动。连锁控制也是常用于开关控制的场合,比如有三个开关,A、B和C,C开关必须在A和B同时打开的时候,才能够打开;或者当A打开时,C必须打开;这种关系就是连锁控制。在工业现场中,尤其是在涉及安全控制的场合,连锁控制方式是很常见的。比如反应釜中的放散阀,当压力达到一定值时,压力开关的信号发生变化,则放散阀门必须立刻打开。电动控制指控制系统的输出是通过电气量或电子信号来进行的,所控制的对象是电动执行元件,比如继电器、步进开关、电磁阀、伺服驱动器和变频器等等,绝大部分的自动控制多多少少都会有电动控制元件。液压控制在机器与设备的操作中,许多控制是用液压控制机构来进行的。在连续速度控制的场合,液压控制通常比较方便和便宜,当能量转换效率较高的时候,液压控制往往和电动控制中的伺服控制同时使用。这时,就形成了效率和精度较高的电液执行机构。
产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
保 证售后服务质量,
优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB ,AB ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA 专业销售进口DCS PLC系统备件模块 15天包退换 一年质保 大量现货 国内实力库存商家
Agilestar – 10G-XNPK-ZRD-1560-61-AS – For Foundry – New
Agilestar – 10G-XNPK-ZRD-1561-42-AS – For Foundry – New
Agilestar – 10G-XNPK-ZRD-1542-94-AS – For Foundry – New
Agilestar – SMC10GXEN-ZR – For SMC – New in Box
Agilestar – ONS-XC-10G-L2 – For Cisco – NIB
Agilestar – ONS-XC-10G-61-4 – For Cisco – NIB
Agilestar – ONS-XC-10G-60-6 – For Cisco – NIB
Agilestar – ONS-XC-10G-59-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-58-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-58-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-57-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-56.5 – For Cisco – NIB
Agilestar – ONS-XC-10G-55-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-54-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-54-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-53-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-52-5 – For Cisco – NIB
Agilestar – ONS-XC-10G-51-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-50-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-50-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-49-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-48-5 – For Cisco – NIB
Agilestar – ONS-XC-10G-47-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-46-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-46-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-45-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-43-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-42-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-42-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-41-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-40-5 – For Cisco – NIB
Agilestar – ONS-XC-10G-39-7 – For Cisco – NIB
Agilestar – ONS-XC-10G-38-1 – For Cisco – NIB
Agilestar – ONS-XC-10G-37-4 – For Cisco – NIB
Agilestar – ONS-XC-10G-36-6 – For Cisco – NIB
Agilestar – ONS-XC-10G-35-8 – For Cisco – NIB
Agilestar – ONS-XC-10G-35-0 – For Cisco – NIB
Agilestar – ONS-XC-10G-34-2 – For Cisco – NIB
Agilestar – ONS-XC-10G-33-4 – For Cisco – NIB
Agilestar – ONS-XC-10G-32-6 – For Cisco – NIB
Agilestar – ONS-XC-10G-31-9 – For Cisco – NIB
Agilestar – ONS-XC-10G-30-3 – For Cisco – NIB
Agilestar – ONS-XC-10G-31-1 – For Cisco – NIB
Agilestar – 10G-XNPK-LW-AS – For Foundry – New in Box
Agilestar – ONS-XC-10G-38-9 – For Cisco – NIB
Agilestar XENPAK-10GB-LW – For Cisco – New in Box
Agilestar – GP-XFP-W59 – For Force 10 Networks – NIB