Modbus TCP is not based on a hierarchical structure, but on a client/server model.
Without any configuration, the embedded Ethernet port of the bus coupler supports Modbus server.
The Modbus server supports the Modbus requests:
|
Function Code Dec (Hex) |
Subfunction Dec (Hex) |
Function |
|---|---|---|
|
3 (3) |
– |
Read holding register (%MW) |
|
6 (6) |
– |
Write single register (%MW) |
|
16 (10) |
– |
Write multiple registers (%MW) |
|
22 (16) |
- |
Mask write register |
|
23 (17) |
– |
Read/write multiple registers (%MW) |
|
43 (2B) |
14 (E) |
Read device identification |
To configure your TM3 Ethernet bus coupler as a Modbus TCP slave device, add the bus coupler and select Modbus TCP IO Scanner > TM3BCEIP.
This table contains the data selection code list:
|
Data Selection Code (hex) |
Description |
|---|---|
|
00 |
Reserved |
|
01 |
Basic Network Diagnostics |
|
02 |
Ethernet Port Diagnostic |
|
03 |
Modbus TCP/Port 502 Diagnostics |
|
04 |
Modbus TCP/Port 502 Connection Table |
|
05 - 7E |
Reserved for other public codes |
|
7F |
Data Structure Offsets |
TM3 Bus Coupler Modbus TCP Registers
|
Zone |
Access |
Registers |
Function |
|---|---|---|---|
|
Diagnostic Zone |
RO |
900 - 901 |
Bus coupler diagnostics |
|
RO |
930 - 931 |
TM2/TM3 bus status |
|
|
RO |
932 |
System state |
|
|
RO |
991 - 992 |
Communication diagnostics |
|
|
RO |
1058...1066 |
Ethernet communication parameters |
|
|
RO |
1100...1115 |
TM3 bus coupler product information |
|
|
RO |
2512 - 2513 |
TM3 bus coupler product serial number |
|
|
IO Scanner Zone |
RO |
1...99 |
Subset of bus coupler module input values (first 7 modules)(1) |
|
RW |
101...199 |
Subset of bus coupler module output values (first 7 modules)(1) |
|
|
RO |
3001...3499 |
Bus coupler module input values (all modules)(1) |
|
|
RW |
3501...3999 |
Bus coupler module output values (all modules)(1) |
|
|
RO |
13001...13499 |
Bus coupler module input values (all modules) for use with HMI devices. |
|
|
RO |
13501...13999 |
Bus coupler module output values (all modules) for use with HMI devices. |
|
|
(1) Access to those registers return an error when System State (register 932) is not 5 (TM3 bus controlled by modbus TCP). |
|||
|
Registers |
Function |
Description |
|---|---|---|
|
900 |
Island status |
Bits (0...8]): Not used |
|
Bit (9): I/O bus runtime error |
||
|
Bits (10-11): Not used |
||
|
Bit (13): I/O bus not configured or bus configuration error |
||
|
Bits (14-15): Not used |
||
|
901 |
I/O modules status |
Bit (0...13): Status of first expansion module to status of 14th expansion module |
|
Bits (14-15): Not used |
||
|
0: No error detected |
||
|
1: Error detected |
|
Registers |
Function |
Description |
|---|---|---|
|
930-931 |
TM2/TM3 bus status |
Bits (0...27) module status (2 bits by module): o0x0: Module OK o0x1: Module configuration error detected o0x2: Module runtime error detected o0x3: Module not present but it is optional module Bits (30-31) bus status: o0x0: Bus OK o0x1: Bus configuration error detected o0x2: Bus runtime error detected o0x3: Bus not configured |
|
Registers |
Function |
Description |
|---|---|---|
|
932 |
State of the system |
o0x0: System is booting. o0x: TM3 bus is not configured. o0x: A TM3 configuration is being transferred. o0x3: A valid TM3 configuration has been applied successfully. The outputs are set to 0. o0x4: TM3 bus is controlled by EIP. o0x5: TM3 bus is controlled by ModbusTCP IO scanner. o0x6: TM3 bus is controlled by Web server. o0x7: Timeout on fieldbus refresh o0x8: Firmware update in progress o0xA: System state transition in progress. |
|
Registers |
Function |
Description |
|---|---|---|
|
991 |
Number of received messages |
Number of messages received. |
|
992 |
Number of sent messages |
Number of messages sent. |
Ethernet Communication Parameters
|
Registers |
Function |
|---|---|
|
1058 |
MAC address |
|
1059 |
|
|
1060 |
|
|
1061 |
IP address currently used |
|
1062 |
|
|
1063 |
Subnet mask currently used |
|
1064 |
|
|
1065 |
Gateway currently used |
|
1066 |
TM3 Bus Coupler Bus Coupler Product Information
|
Registers |
Function |
|---|---|
|
1100 |
TM3 bus coupler product code |
|
2507-2508 |
TM3 bus coupler product firmware version |
|
2512-2513 |
TM3 bus coupler product serial number |
|
2601 |
Rotary switch ONEs position |
|
2602 |
Rotary switch TENs position |
