Appendix
H SM277B Module
SM277B, connect with 6 digital or analog I/O expansion modules at most, is a modular slave
station device for PROFIBUS DP network, which could communicate with DP master station.
With terminal connecting PROFIBUS network instead of standard connectors, the baud rate is
automatically adjusted to be consistent with the main station.
【Main feature】
Photoelectric isolation technique, strong anti-interference ability, high reliability.
Power supply with reverse connection protection and surge absorption function, suitable for
harsh industrial environments.
【Terms for use】
Signal lines should be shielded twisted-pair cable, and double side grounding.
Ground the module earthing terminal under the condition of the system has a good
grounding, otherwise not grounded.
As the last station, termination resistors should be ON position
H.1 PROFIBUS-DP Network Structure
Distributed I/O systems contain active (master) and passive (slave) nodes that are
interconnected through PROFIBUS-DP.
The following figure shows SM 277B in a typical PROFIBUS-DP network configuration:
DP master
.......
Expansion modules
EM277B
PG/PC
MPI
PROFIBUS connection
Figure H-1 Construction of SM277B PROFIBUS-DP network
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