Chapter 14 Remote  I/O Communication Module  AHRTU-PFBS 
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14.9.6  PLC Programs Writing 
【Control program in master PLC】 
After the master PLC runs and M0 is ON, the master PLC controls the modules connected to 
AHRTU-PFBS-5A; when M1 is ON, the master PLC reads the values of the modules connected to 
AHRTU-PFBS-5A.