Automação Industrial :: CLP FX3U :: Rede Modbus Master :: Lendo e Escrevendo em Registradores.

Nesse vídeo explico como escrever um programa em ladder para o CLP FX3U utilizando a rede Modbus RTU sendo o CLP atuando como master da rede.
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Program Comments:
Line 0 :
RS585 Setup:
M8002 :: Power on pulse
D8120 :: Special register to RS485 Setup
Load in D8120 = 1000000010010001 = H8091
B0: 1 --Data length 8 Bits
B1-B2: 00 --Parity None
B3: 0 --Stop bits 1
B4-B7: 1001 --Transfer rate 19.2 Kbps
B8: 0 --Start symbol - None
B9: 0 --Terminator - None
B10-B11:00 -- Unavailable - NULL
B12-B15:1000 --ModBus RTU Master
D8121 :: Special register to storage Modbus Master ID-Address
Load in D8121 = 0
D8129 :: Configure time out flag --milliseconds
Load in D8129 = 5000
Line 21:
The counter C0 is 1?
Read Operation:
IVRD H203 K0 D2 K10
H203
High byte = Slave ID-Address = 02
Low byte = Modbus command = Read Holding Register = 03
K0
Data address to be read in slave -First- address holding register block
D2:
PLC register--first-- to storage data
K10:
K10 = H000A
High 8 Bits: 0 to RS485 channel-port, 1 to RS232 channel
Low 8 Bits: Number of registers to read = 10 registers --16 bits.
Line 35:
Execute Modbus read implementations.
Reset M8123 flag --receive is completed
Line 38:
The counter C0 is 2?
Set M8122 flag --ready to transfer.
Line 45 :
Execute Modbus write operation.
IVWR H206 K50 D100 K1
H206
High byte = Slave ID-Address = 02
Low byte = Modbus command = Preset single register = 06
K50
Data address to be write in slave
D100:
PLC register to send data.
K1:
K1 = H0001
High 8 Bits: 0 to RS485 channel-port, 1 to RS232 channel
Low 8 Bits: Number of address to write in slave = 1 address
Line 55:
Reset C0 counter.