Because both S7-300PLCs are master stations, and each master station has its own DP network, if we connect two DP networks together, it is impossible to communicate, because only one master can be allowed in one network. Station, here we need something like "translation", DP/DP coupler
DP/DP coupler physical picture:
DP/DP coupler connection diagram:
From the above figure, we can see that both PLC1 and PLC2 have their own PROFIBUS-DP networks, and they are master stations in their own networks. They exchange data through DP/DP couplers.
Note: Since PROFIBUS-DP(1) and PROFIBUS-DP(2) are two completely different networks, the communication speed between them can be different, and each can have its own DP slave. The site address can be repeated.
Start the configuration of the PROFIBUS-DP master communication:
The first step: establish a PLC master station, configure the data exchange area
Configure the hardware of the master station and establish a PROFIBUS-DP network
The hardware configuration and data exchange configuration of the main station one is completed. Here we need to record the address of the data exchange as shown in the figure:
Step 2: Establish PLC main station 2, configure data exchange area
The hardware configuration and data exchange configuration of the primary station 1 and the primary station 2 are completed. According to the data exchange information of the primary station 1 in the first step, the current data exchange correspondence is as follows:
In the master station 1 and the master station 2, the configured data exchange address can be directly used for programming, and no address mapping is required.
DP and DP coupler DP interface and address dialing instructions, as shown:
Box Header Connector,Vertical Type Box Header Connector,Dip Vertical Type Box Header Connector,Double Row Box Header Connector
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