文档介绍：S7-200 做主站 S7-300 CP341 做从站的 Modbus RTU 通讯
Modbus munication – S7-200 as Master and S7-300 CP341 as Slave
Getting-Started Edition (2010 年 6 月)
摘要本文档讨论使用 S7-200 做主站,S7-300 CP341 做从站的 Modbus RTU 通讯。
关键词 CP341,Modbus RTU,功能码,S7-200
Key Words CP341,Modbus RTU,Function Code,S7-200
IA&DT Service & Support Page 2-22
目录
1. 概述..................................................................................................................................4
2. 软件环境...........................................................................................................................4
STEP7 SP4.........................................................................................................4
CP PTP Param SP11..........................................................................................4
CP PTP Modbus Slave SP7................................................................................4
STEP7 Micro/WIN SP6 .......................................................................................4
Toolbox_V32-STEP 7-Micro WIN 32 Instruction Library .............................................4
3. 硬件列表和接线.................................................................................................................5
硬件列表......................................................................................................................5
硬件接线......................................................................................................................5
接口定义................................................................................................................5
接线示意图............................................................................................................6
4. 组态设置和编程.................................................................................................................6
S7-200 做Modbus主站的设置.