Communication Protocol and Networking Mode
The following example is multiple masters with multiple slaves. Programming PG/PC and HMI as
Masters, CTH200 PLC as Slaves.
Figure 5-2 Multi masters PPI network
The following example is multiple CTH200 CPUs interconnection, which using NETR/NETW
instructions to achieve network communication. Each CTH200 CPUs can be either Master or
Slave, they communicate with each other via the PPI port.
Figure 5-3 Multi CPU interconnection network
5.2 MPI Communication
MPI Support master-slave and master-master communication.
CTH200 PLC can be connected to MPI network by using built-in interface with baud rate
19.2Kbps or 187.5Kbps, and also communicate with SIMATIC S7-300/S7-400 CPU as slaves in
MPI network.
Multiple masters in MPI network
As shown in the following figure, S7-300 PLC and Copanel HMI as masters in MPI network,
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