YASKAWA CP 341 Manual page 61

VIPA System 300S
6.4.4.3 FC 03 - Read Output Registers
6.4.4.4 FC 04 - Read Input Registers
HB130 | CP | 341-1CH01 | en | 18-40
This function serves to read individual registers of the output area of the slave.
DB SEND source
Address Name
+0.0 ADDR
+1.0 FUNC
+2.0 start_register
+4.0 register_number
n start_register
– start_register is not checked by the driver and is sent unchanged.
n register_number
– 1...127 (ASCII: 1...125) registers (words) may be read.
DB RCV destination
Address Name
+0.0 data[1]
+2.0 data[2]
... ...
This function serves to read individual registers of the input area of the slave.
DB SEND source
Address Name
+0.0 ADDR
+1.0 FUNC
+2.0 start_register
+4.0 register_number
start_register
n
– start_register is not checked by the driver and is sent unchanged.
n register_number
– 1...127 (ASCII: 1...125) registers (words) may be read.
Communication protocols
Modbus > Modbus Master - Function codes
Type Comment
BYTE Slave address
BYTE Function code
WORD Register start address
INT Amount of registers
Type Comment
WORD Data
WORD Data
... ...
Type Comment
BYTE Slave address
BYTE Function code
WORD Register start address
INT Amount of registers
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