YASKAWA CP 341 Manual page 65

VIPA System 300S
6.4.4.11 FC 15 - Force Multiple Coils
6.4.4.12 FC 16 - Preset Multiple Registers
HB130 | CP | 341-1CH01 | en | 18-40
This function code serves to change up to 2040 (ASCII: 1976) bits in the slave.
DB SEND source
Address Name
+0.0 ADDR
+1.0 FUNC
+2.0 start_addr
+4.0 bit_number
+6.0 coil_state[1]
n start_addr
– start_addr is not checked by the driver and is sent unchanged.
n bit_number
– Any value between 1...2040 (ASCII: 1...1976) is permitted as bit_number.
This indicates how many bits in the slave should be overwritten.
n coil_state[1]
– State Coil:
5Fh...58h
57h...50h
This function code serves to overwrite up to 127 (ASCII: 123) registers in the slave with
one request message.
DB SEND source
Address Name
+0.0 ADDR
+1.0 FUNC
+2.0 start_register
+4.0 register_number
+6.0 data[1]
+8.0 data[2]
+10.0 data[3]
... ...
n start_register
– start_register is not checked by the driver and is sent unchanged.
n register_number
– Any value between 1...127 (ASCII: 1...123) is permitted as register_number.
This indicates the number of registers (1 register = 2bytes) to be read.
Communication protocols
Modbus > Modbus Master - Function codes
Type Comment
BYTE Slave address
BYTE Function code
WORD Bit start address
INT Number of bits
WORD State Coil
Type Comment
BYTE Slave address
BYTE Function code
WORD Register bit start address
INT Register amount of bits
WORD Register data
WORD Register data
WORD Register data
... ...
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