Processing Requests
The data for Modbus communication are processed between the master and slaves as shown below.
Bit Data at Slaves (Function Codes 01, 02, 05, and 15)
Master Device Address: Internal Relay
•
Internal Relay (M)
Bit +0
Bit +1
Bit +2
Master Device Address: Data Register
•
Data Register (D)
Word +0
Word +1
Word +2
Word Data at Slaves (Function Codes 03, 04, 06, and 16)
Master Device Address: Internal Relay
•
Internal Relay (M)
Bit +0
Bit +16
Bit +32
Master Device Address: Data Register
•
Data Register (D)
Word +0
Word +1
Word +2
Master
. . .
b15
b14
b2
. . .
b15
b14
b2
. . .
b15
b14
b2
Master
. . .
+15
+14
+2
. . .
+31 +30
+18
. . .
+47 +46
+34
Master
. . .
b15
b14
b2
. . .
b15
b14
b2
. . .
b15
b14
b2
Master
FC6A S
M
S
A
ERIES
ICRO
MART
LL
Modbus Address
Bit +0
Bit +1
Bit +2
Slave
b1
b0
b1
b0
b1
b0
+1
+0
+17 +16
+33 +32
b1
b0
b1
b0
b1
b0
-
-O
T
C
IN
NE
YPE
OMMUNICATION
6: M
ODBUS
Modbus Address
Bit +0
Bit +1
Bit +2
Slave
Modbus Address
Word +0
Word +1
Word +2
Slave
Modbus Address
Word +0
Word +1
Word +2
Slave
M
FC9Y-B1730
ANUAL
C
OMMUNICATION
6-7