750-841 WAGO, 750-841 Datasheet - Page 160

• 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

152 •
4.2.3 Description of the MODBUS Functions
Fieldbus Communication
MODBUS Functions
Note
In the case of the read functions (FC1 – FC4) the outputs can be additionally
written and read back by adding an offset of 200
addresses in the range of [0
MODBUS addresses in the range of [6000
Exception Code
All MODBUS functions are executed as follows:
A MODBUS TCP master (e.g., a PC) makes a request to the WAGO fieldbus
node using a specific function code based on the desired operation. The
WAGO fieldbus node receives the datagram and then responds to the master
with the proper data, which is based on the master’s request.
If the WAGO fieldbus node receives an incorrect request, it sends an error
datagram (Exception) to the master.
The exception code contained in the exception has the following meaning:
The following chapters describe the datagram architecture of request, response
and exception with examples for each function code.
0x0A
0x0B
0x01
0x02
0x03
0x04
0x05
0x06
0x08
Meaning
Illegal Function
Illegal Data Address
Illegal Data Value
Slave Device Failure
Acknowledge
Server Busy
Memory Parity Error
Gateway Path Unavailable
Gateway Target Device Failed To Respond
hex
- FF
hex
] and an offset of 1000
hex
- 62FC
hex
(0x0200) to the MODBUS
hex
].
WAGO-I/O-SYSTEM 750
hex
(0x01000) to the
ETHERNET TCP/IP