西门子s7-200 plc地址与 modbus 地址是怎么对应的?
推荐回答(2个)
00001至00128是映射至Q0.0 - Q15.7的离散输出,
10001至10128是映射至I0.0 - I15.7的离散输入,
30001至30032是映射至AIW0至AIW62的模拟输入寄存器
40001至4xxxx是映射至V存储器的保持寄存器。
所有Modbus地址均以1为基位。
下表显示映射至S7-200地址的Modbus地址。
00001 Q0.0、00002 Q0.1、00003 Q0.2
00127 Q15.6、00128 Q15.7、10001 I0.0、10002 I0.1、10003 I0.2
10127 I15.6、10128 I15.7、30001 AIW0、30002 AIW2、30003 AIW4
30032 AIW62、40001 Hold Start、40002 HoldStart+2、40003 HoldStart+4
4xxxx HoldStart+2 x
Modbus地址与Modbus的功能码是两个概念。根据 Modbus 通信协议,Modbus 数据的地址使用 0*x、1*x、3*x 和 4*x 的形式,分别表示数字量输出、数字量输入、模拟量输入等数据地址。在使用 S7-200 的指令库时,Modbus 数据地址与 S7-200 的 I/O 和数据存储区地址间有特定的对应关系。
Modbus 地址所访问的数据,是通过各种“功能”读写而来。功能码是 Modbus 地址的底层。如果 Modbus 通信的一方提供的所谓 Modbus 协议只有功能码,则需要注意了解此功能号与 Modbus 地址间的对应关系。
00001至00128是映射至Q0.0 - Q15.7的离散输出
10001至10128是映射至I0.0 - I15.7的离散输入
30001至30032是映射至AIW0至AIW62的模拟输入寄存器
40001至4xxxx是映射至V存储器的保持寄存器。
所有Modbus地址均以1为基位。下表显示映射至S7-200地址的Modbus地址。
Modbus地址 S7-200地址
00001 Q0.0
00002 Q0.1
00003 Q0.2
... ...
00127 Q15.6
00128 Q15.7
10001 I0.0
10002 I0.1
10003 I0.2
... ...
10127 I15.6
10128 I15.7
30001 AIW0
30002 AIW2
30003 AIW4
... ...
30032 AIW62
40001 Hold Start
40002 HoldStart+2
40003 HoldStart+4
... ...
4xxxx HoldStart+2 x
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