Processing requests -6, Tcp c, Processing requests – IDEC MicroSmart Pentra User Manual
Page 94
9: M
ODBUS
TCP C
OMMUNICATION
9-6
W
EB
S
ERVER
CPU M
ODULE
U
SER
’
S
M
ANUAL
FC9Y-B1278
Processing Requests
The data for Modbus communication are processed between the client and servers as shown below.
Bit Data at Servers (Function Codes 01, 02, 05, and 15)
• Master Device Address: Internal Relay
• Master Device Address: Data Register
Word Data at Slaves (Function Codes 03, 04, 06, and 16)
• Master Device Address: Internal Relay
• Master Device Address: Data Register
Internal Relay (M)
Modbus Address
Master
Slave
Bit +0
Bit +1
Bit +2
Bit +0
Bit +1
Bit +2
Data Register (D)
Modbus Address
Master
Slave
Bit +0
Bit +1
Bit +2
Word +0
Word +1
Word +2
b15
b15
b15
b14
b14
b14
. . .
. . .
. . .
b2
b2
b2
b1
b1
b1
b0
b0
b0
Internal Relay (M)
Modbus Address
Master
Slave
Bit +0
Bit +16
Bit +32
Word +0
Word +1
Word +2
+31
+47
+14
+30
+46
. . .
. . .
. . .
+2
+18
+34
+1
+17
+33
+0
+16
+32
+15
Data Register (D)
Modbus Address
Master
Slave
Word +0
Word +1
Word +2
Word +0
Word +1
Word +2
b15
b15
b15
b14
b14
b14
. . .
. . .
. . .
b2
b2
b2
b1
b1
b1
b0
b0
b0