CTH200 Series PLC User Manual
SM277A is a slave station device for MPI networks that can connect up to 6 extension modules
for digital or analog I/O.
As MPI slave station, the SM277A module can be run at any MPI baud rate between 9.6K and
12M. Also receives a variety of different I/O configurations and different amounts of data from the
master station and sends data to the master station, and SM277A can also read and write
variable data blocks defined in the CTH200 CPU, allows the user to exchange any type of data
with the master station.
Components of SM277A
Status LED is located on the front of the module, address switch, terminal resistance switch ,DP
slave interface terminal and user power supply are located on the side of wiring terminal, see as
following figure:
Status LED
Terminal resistance switch: ON means with terminal resistance, OFF means without terminal
resistance.
Isolated signal A1
Isolated signal B1
Isolated signal A2
Isolated signal B2
User Power supply
Address switch: Setup by 8 bits dial switch, and expressed in binary form, the available range
is 0~126.
A1/B1 and A2/B2 are both RS-485 electric port, consistent internal electric characters,
you can choose to connect one or two group.
PROFIBUS DP communication between S7-300 and SM277A of CTH200
PROFIBUS DP communication between S7-300 and SM 277A of CTH200 need S7-300 station
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