Chapter 9 Expansion Module
227
Communication Module
MBUS Module
Summarize
MBUS module makes SG2 without the ability of communication control be controlled with other controller via
RS 485 Modbus protocol. MBUS just can make SG2 work as slaver, responses the request of master, but it can’t
work as master. MBUS makes the scan time of SG2 become longer; and it depends on the content of the
communication command. Normally, the extended time is less than 20ms, but it will be 100ms if the order is to set
the preset value of function.
MBUS Cell Configuration
①
: Connecting port
②
: Power
③
: SW2, 2-bit switch (terminal resistance selection)
④
: RUN, running LED light
⑤
: COMM. Communication LED light
⑥
: Error, state LED light
⑦
: RS 485 port
⑧
: SW1, 8-bit switch (set format of communication)
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