MPCS: A Wireless Communication Protocol for Ubiquitous Industrial Environment - Advanced Research on Computer Education, Simulation and Modeling - page 410

Communication Instruction Library. With the MODBUS instruction, the S7-224 can
use MODBUS via its programmable UART interface.
To verify the performance and interoperability of MPCS protocol, we did a test of
the system in section 2. The monitoring period of controlling center is 1 second. The
PLCs used are distributed among 30 meters distance. Table 1 shows the result of the
test. One Siemens PLC of S7-224 and two Xinjie PLCs of XC3-24RT-E send 3000
packets relatively and the central computer records these packets. Basically, the test
results are satisfied, and the MPCS protocol are suitable in non-critical industrial
environment.

Table 1. Test Result

PLC S7-224 XC3-24RT-E(1#) XC3-24RT-E(2#)

Transmit Packets 3000 3000 3000

Receive Packets 2860 2827 2831

Successful Rate 98.66% 94.23% 97.7%

5 Conclusion

MPCS communication protocol is developed for industrial monitoring system. The
results show the performance and interoperability for the wireless networks are good
enough for some monitoring and non-critical instrument systems.

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