用顺序控制指令写出用一个按钮控制红黄绿三个灯循环显示程序，时间间隔为1s，西门子s7-200进行PLC编程

TITLE=程序注释
Network 1 // 网络标题
// 网络注释
LD I0.0
O Q0.0
O T45
AN T40
AN I0.1
= Q0.0
TON T40, 10
Network 2
LD T40
O M0.0
AN T41
AN I0.1
= M0.0
TON T41, 10
Network 3
LD T41
O Q0.1
AN T42
AN I0.1
= Q0.1
TON T42, 10
Network 4
LD T42
O M0.1
AN T43
AN I0.1
= M0.1
TON T43, 10
Network 5
LD T43
O Q0.2
AN T44
AN I0.1
= Q0.2
TON T44, 10
Network 6
LD T44
O M0.2
AN T45
AN I0.1
= M0.2
TON T45, 10