1. 设计和功能

根据统计数字表明，所有自动化组件（无论是机械式、机电式，还是电子式）都会出现故障。因此，工厂维护和工厂改造也就必不缺少。在实际应用中，期待的可用性是不现实的。通过西门子 SIMATIC S7-400H，能够较大限度地降低生产故障机率，较大化生产率。

SIMATIC S7-400H 具有以下功能：出现故障时，能够无扰切换。 集成故障检测功能；提前检测故障，避免影响生产过程。在线维护，即可在工厂运行期间，更换故障组件。组态更改，即可在工厂运行期间，进行工厂扩容。自动事件同步，高可用性通信，冗余连接I/O 设备。

S7-400 PNH CPU的同步分为两种，一种用于长10m 的 FOC patch 光纤，另一种用于长10km 的单模全双工 LC/LC 光纤（9/125 μ）。冗余系统的同步光纤分为1m、2m、10m 和10km 四种。同步速率达到400Mbps。

FANUC A20B-8200-0845 Tested in Good condition

FANUC A20B-8200-0843 Tested in Good condition

FANUC a20b-8200-0792 Tested in Good condition

FANUC A20B-8200-0780 Tested in Good condition

FANUC A20B-8200-0760 Tested in Good condition

FANUC A20B-8200-0724 Tested in Good condition

FANUC A20B-8200-0721 Tested in Good condition

FANUC A20B-8200-0542 Fast ship with warranty

FANUC A20B-8200-0472 board tested

FANUC A20B-8200-0471 Tested in Good condition

Fanuc A20B-8200-0470 PCB Board In Good Condition

FANUC A20B-8200-0396 Tested in Good condition

FANUC A20B-8200-0393 Tested in Good condition

FANUC A20B-8200-0392 Tested in Good condition

FANUC A20B-8200-0391 Tested in Good condition

FANUC A20B-8200-0385 Tested in Good condition

FANUC A20B-8101-0770 Tested in Good condition

FANUC A20B-8101-0401 Tested in Good condition

FANUC A20B-8101-0375 Tested in Good condition

FANUC A20B-8101-0374 Tested in Good condition

FANUC A20B-8101-0350 Tested in Good condition

FANUC A20B-8101-0281 In Good Condition

Fanuc A20B-8101-0170 Fast ship with warranty

FANUC A20B-8101-0120 Tested in Good condition

Fanuc A20B-8101-0023 Tested in good condition

FANUC A20B-8100-0981 Tested in Good condition

Fanuc A20B-8100-0980 Tested in Good condition

FANUC A20B-8100-0920 Tested in Good condition

Fanuc A20B-8100-0791 Tested in Good condition

Fanuc A20B-8100-0665 Board In Good Condition

FANUC A20B-8100-0663 Tested in Good condition

Fanuc A20B-8100-0660 PCB Board In Good Condition

FANUC a20b-8100-0547 Tested It In Good Condition

FANUC A20B-8100-0410 Tested in Good condition

FANUC A20B-8100-0301 Tested in good condition

FANUC A20B-8100-0170 Tested in Good condition

Fanuc A20B-8100-0137 Motherboard In Good Condition

FANUC A20B-8100-0136 Tested in Good condition

FANUC a20b-8100-0131 Tested in Good condition

FANUC A20B-8100-0130 Tested in Good condition

Fanuc A20B-3900-0304 Fast ship with warranty

Fanuc a20b-3300-0878 Fast ship with warranty

FANUC A20B-3300-0820 Tested in Good condition

Fanuc A20B-3300-0774 PCB Board In Good Condition

FANUC A20B-3300-0768 Tested in Good condition

Fanuc a20b-3300-0671 Fast ship with warranty

Fanuc A20B-3300-0479

FANUC A20B-3300-0398 CPU board tested

Fanuc A20B-3300-0395 Fast ship with warranty

FANUC A20B-3300-0361 Tested It In Good Condition

Fanuc a20b-3300-0202 Tested in Good condition

Fanuc A20B-3300-0200 Tested in Good condition

FANUC A20B-3300-0151 Tested in Good condition