CTH200 Series PLC User Manual
4.7 Communication Module Specifications
Table 4-7-1 Communication modules Order info
SM277A Profibus DP slave interface module, 12M, optoelectronic
isolation
SM277B Profibus DP slave module, 1.5M, optoelectronic isolation
SM277C CAN slave module, with 8DI/6DO, optoelectronic isolation,
expand to 7 modules
Both SM277A and SM277B adopt photoelectric isolation technology, with high reliability and
strong anti-interference ability. These two modules are equipped with terminal resistance, bus
connection, no need for special network connector. Its power supply has the function of reverse
connection protection and surge absorption, and can be used in harsh working environment.
However, SM277A needs to cooperate with the CPU, while SM277B can be used as a
standalone slave station with six extension modules, the scale of slave station I/O up to
128DI/128DO, 48AI/24AQ.
4.7.1 SM277A DP Slave Interface Module Specifications
Table 4-7-2 SM277A modules specifications
PROFIBUS-DP/MPI
baud rate (auto setting)
9.6/19.2/45.45/93.75/187.5/500Kbps; 1/1.5/3.6/12Mbps
Not in data
exchange mode
Leave the data
exchange
mode
parameterize/
configuration
error