Chapter 6 Applied Instruction 8-bit mode: PLC External equipment The PLC sends “ ： 00 03 1000 0003 EA CR LF”. External equipment PLC The PLC receives “ ： 00 03 06 1234 5678 95A5 A9 CR LF”. The transmission registers in the PLC:
(The PLC sends the message.) 6-382 Register Data Description D105 High 8 bits ‘0’ 16#30 Data in the device at address 16#1001 D106 Low 8 bits ‘4’ 16#34 D106 High 8 bits ‘E’ 16#45 D107 Low 8 bits ‘6’ 16#36 D107 High 8 bits ‘C’ 16#43 LRC CHK 1 D108 Low 8 bits ‘D’ 16#44 LRC CHK 0 D108 High 8 bits CR 16#0D END D109 Low 8 bits LF 16#0A Register Data Description D10 Low 8 bits ‘：’ 16#3A STX D11 Low 8 bits ‘0’ 16#30 ADR 0 ADR (00) is the station address of the external equipment. D12 Low 8 bits ‘0’ 16#30 ADR 0 D13 Low 8 bits ‘0’ 16#30 CMD 0 CMD (03) is the command code.
D14 Low 8 bits ‘3’ 16#33 CMD 3 D15 Low 8 bits ‘1’ 16#31 Initial data address D16 Low 8 bits ‘0’ 16#30 D17 Low 8 bits ‘0’ 16#30 D18 Low 8 bits ‘0’ 16#30