750-841 WAGO, 750-841 Datasheet - Page 159

• Manufacturer Part Number: 750-841
• Description: CONTR.ETHERNET TCP/IP 10/100MBIT
• Manufacturer: WAGO

Specifications of 750-841

• Rohs Compliant: YES
• No. Of Digital Inputs: 10
• No. Of Digital Outputs: 10

4.2.2 Use of the MODBUS Functions
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Attention
It is recommended that analog data be accessed with register functions (1) and
digital data with coil functions (2).
The example below uses a graphical view of a fieldbus node to show which
MODBUS functions can be used to access data of the process image.
Fig. 4-13: Use of the MODBUS Functions
1 1
3
FC 3 (
FC 4
MODBUS addresses
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
FC 2 (
Read Multiple Registers
(Read Input Registers)
Highbyte
FC 1 (
2
Read Input
MODBUS
addresses
0x0008
0x0009
0x000A
0x000B
0x000C
0x000D
0x000E
0x000F
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
Input modules 750- 402 402 472 472 402 476 402 476
Read Coils)
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Lowbyte
Discretes
Ethernet
ON
LINK
TxD/RxD
ERROR
I/O
)
DI DI
)
AI AI
DI
AI
DI
AI
FC 3 (
FC 16 (
1
3
1
3
FC 4 (
FC 6 (Write
FC 15 (Force Multiple Coils)
FC 2 (
2
2
0x0200
0x0201
0x0202
0x0203
0x0204
0x0004 /
0x0204
MODBUS addresses
0x0000 / 0x0200
0x0001 / 0x0201
0x0002 / 0x0202
0x0003 / 0x0203
MODBUS addresses
Read
Write
Fieldbus Communication
Read Input Registers)
MODBUS addresses
0x0200
0x0201
MODBUS addresses
0x0000 / 0x0200
0x0001 / 0x0201
FC 1 (
FC 5 (Write Coil)
Read Input Discretes)
Multiple
Highbyte
Multiple Registers)
Highbyte
Single Register
Read Coils)
MODBUS Functions
Output modules 750- 501 550 550
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Word2
Word1
Word2
Word2
Registers)
Lowbyte
Lowbyte
)
DO
AO
AO
G012918e
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