Chapter 4
Configuration
MAN_905G_1.16
Page 116
Enable Ethernet Debug
Select this box if you wish to enable Ethernet Diagnostics on the 905G via configuration
software (see section 6.3 for details). For security reasons, disabling this option will disallow
all Ethernet diagnostics functions accessible to configuration software, and can only be
reactivated via serial port configuration.
4.11.2
Modbus TCP
To use Modbus TCP, select the Enable Modbus Server box and deselect the Enable
Ethernet/IP box. This will automatically remove the “I/O Instance” selection for all fieldbus
mappings. It is possible for both Modbus TCP and Ethernet/IP to be selected - in this case,
select “Disable I/O Instance” individually for each Modbus TCP fieldbus mapping.
Supported Commands:
Function
Code
Function Name
Class
Affects Area
Address
Method
1
Read coils
1
IN/OUT
Bit
2
Read Input discretes
1
IN/OUT
Bit
3
Read multiple registers
0
IN/OUT
Word
4
Read input registers
1
IN/OUT
Word
5
Write coil
1
OUT
Bit
6
Write single register
1
OUT
Word
7
Read exception status
1
-
-
15
Force multiple coils
2
OUT
Bit
16
Force multiple registers
0
OUT
Word
22
Mask write register
2
OUT
Word
23
Read/Write registers
2
IN/OUT
Word
Supported Exception Codes:
Exceptio
n Code
Name
Description
01
Illegal function
The module does not support the function code in the query
02
Illegal data address
The data address received in the query is outside the
initialized memory area
03
Illegal data value
The data in the request is illegal
Modbus/TCP Addressing
The IN and OUT areas of the Ethernet interface are addressed under Modbus/TCP according
to the tables below. Since Modbus uses a 16-bit format, “Word (16-bit) Address Mode” will
be automatically applied whenever the “Modbus/TCP” checkbox is checked. If Ethernet/IP is
