CTH200 Series PLC User Manual
5 Communication Protocol and Networking Mode
CTH200 series PLC support various ways of network communication, from normal serial port
communication to Ethernet. Supporting communication protocols including PPI, MPI, Freeport,
CANopen, Ethernet, profibus-DP and PROFINET. Choose protocol in your need, see chapter 2.2
Communicate with CTH200 for specific communication mode and connection.
5.1 PPI Communication
PPI is a master-slave protocol by which the master sends request to the slave for responding.
Slaves would be standby without master request. CTH200 PLC support PPI protocol to use
NETR/NETW instructions transferring data with baud rate 9.6kbps, 19.2kbps and 187.5kbps.
CTH200 PLC uses the build-in programming port as normal Communication networking interface,
no need for additional configuration for module or software.
Up to 31 PLCs, Copanel HMIs, Siemens OP/TP panel or MPI cards as station on Host involve in
the PPI communication network.
Single master in PPI
The following example is one-master with one-slave. Programming PG/PC as Master, CTH200
PLC as Slave.
Copanel HMI as Master, CTH200 PLC as Slave.
Figure 5-1 single master PPI network
Note: It’s recommended to use PLC Programming cable from Cotrust. Communication cable
selection is depend on specific HMI, to avoid devices damaging.
Multiple masters in PPI
The following example is two masters with one slave. Programming PG/PC and HMI as Masters,
CTH200 PLC as Slave.
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