LTMT Main Unit with PROFIBUS DP Protocol

Description

The LTMT main unit with PROFIBUS Decentralized-Peripherals (DP) protocol is equipped with two PROFIBUS DP communication ports on the front face.

A	Sub-D 9 connector for connection to the PROFIBUS DP network with baud rate up to 12 Mbps
B	Terminal connector for connection to the PROFIBUS DP network with baud rate up to 1.5 Mbps

Both the ports are functionally identical. They follow the PROFIBUS DP interoperability standards. It is recommended to use the sub-D 9 connector for communication.

NOTE: The LTMT main unit with PROFIBUS DP protocol must be connected through a single port only.

Port Settings

The PROFIBUS DP ports have the following configurable settings:

Setting	Setting range	Default setting
Node address	1–125 in step of 1	126
Product profile	TeSys Tera	TeSys Tera
Endianness	Big-endian Little-endian	Big-endian

The PROFIBUS DP port settings can be configured using the following interfaces:

A PC running the TeSys Tera DTM embedded in a FDT container, such as SoMove software.
The LTMTCUF control operator unit.

NOTE: The node address can be set by using PLC or DCS via the communication network.

Node Address

The node address is the address of the LTMT main unit on the PROFIBUS DP bus. You can assign an address from 1 to 125. The factory setting for the address is 126.

You must set the node address before any communication can begin.

NOTE: Address 0 is an invalid value and is not permitted. Return to the factory settings command or clear network setting that sets the node address to the invalid value 126.

Communication Loss Function

Communication loss function detects the loss of communication between the LTMT main unit and the PLC or DCS connected via the communication network, once communication has been established. For more information, refer to Communication Loss section in TeSys Tera Motor Management System User Guide – DOCA0257EN.

Endianness

Endianness is the order in which bytes within a word of digital data are transmitted through a data communication medium. Endianness is represented in two ways:

Big Endian:

A big-endian system stores the most significant byte at the smallest memory address and the least significant byte at the largest memory address.
Little Endian:

A little-endian system stores the most significant byte at the largest memory address and the least significant byte at the smallest memory address.