Modbus TCP Addressing

TeSys™ island applies the following Unit ID ranges for physical and virtual modularity.

Item	Unit ID	Comment
Avatars	1–99	Device, Load, and Application Avatars
Bus Devices	101–199	Digital I/O Module (DIOM) Analog I/O Module (AIOM) Starters SIL Starters Power Interface Module (PIM) SIL Interface Module (SIM) Voltage Interface Module (VIM)
Bus Coupler/System Avatar	255	—

NOTE:

Bus devices are numbered sequentially, left to right.
Avatars are numbered as defined in the Context File.
Data larger than 16 bits is split into multiple registers, encoded in Big Endian. For example, a 32-bit integer value of decimal 305419896 (or 0x12345678 hexadecimal) is mapped onto two registers, 500 and 501, where register 500 contains the most significant word (0x1234) and register 501 contains the least significant word (0x5678).
Modbus TCP manual integration is done without IO Scanning so that each piece of data or command is represented with a single register read/write. To maintain the ability to detect a communication loss and enter Degraded Mode, a heartbeat register is available for use at address 1098 of Unit ID 255. You can write any value to this register periodically within the Communication Loss Timeout period (by default is 2 seconds). If the island does not detect a write, it signifies a communication loss and the system enters Degraded Mode.
See the table below for examples.

Order of Avatar in Digital Tool	Avatar Unit ID	Description	Physical Order in island
Order of Avatar in Digital Tool	Avatar Unit ID	Description	1	2	3	4	5	6	7	8	9
1	255	System	BC	—	—	VIM	—	—	SIM	—	—
2	1	AIOM	—	AIOM	—	—	—	—	—	—	—
3	2	Motor Two Directions — SIL Stop, W. Cat 1/2*	—	—	—	—	SIL Starter	SIL Starter	—	—	—
4	3	Motor One Direction	—	—	—	—	—	—	—	Starter	—
5	4	Power Interface with I/O (Control)	—	—	DIOM	—	—	—	—	—	PIM
Modbus/TCP Physical Device Unit ID			255	101	102	103	104	105	106	107	108

FLA for avatars can be configured through Modbus TCP/IP using Register-9622 and Avatar ID as the server ID.