Wiring of the Ethernet Network

Overview

This chapter describes how to connect an LTMR controller to an Ethernet network using an RJ45 connector.

WARNING
LOSS OF CONTROL The designer of any control scheme must consider the potential failure modes of control paths and, for certain critical functions, provide a means to achieve a safe state during and after a path failure. Examples of critical control functions are emergency stop and overtravel stop. Separate or redundant control paths must be provided for critical control functions. System control paths may include communication links. Consideration must be given to the implications of anticipated transmission delays or failures of the link.⁽¹⁾ Each implementation of an LTMR controller must be individually and thoroughly tested for proper operation before being placed into service. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

LOSS OF CONTROL

The designer of any control scheme must consider the potential failure modes of control paths and, for certain critical functions, provide a means to achieve a safe state during and after a path failure. Examples of critical control functions are emergency stop and overtravel stop.
Separate or redundant control paths must be provided for critical control functions.
System control paths may include communication links. Consideration must be given to the implications of anticipated transmission delays or failures of the link.⁽¹⁾
Each implementation of an LTMR controller must be individually and thoroughly tested for proper operation before being placed into service.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

(1) For additional information, refer to NEMA ICS 1.1 (latest edition), Safety Guidelines for the Application, Installation, and Maintenance of Solid State Control.

Ethernet Network Characteristics

Overview

The LTMR Ethernet TCP/IP controller complies with the specifications of the EtherNet/IP and Modbus/TCP protocols.

Characteristics for Connection to the Ethernet Network

Characteristics	Value
Maximum number of LTMR controllers per subnet	A network with a DHCP server is limited to 160 LTMR controllers.
Maximum number of LTMR controllers per segment	Limit the number of LTMR controllers on a daisy chain network to 16 to avoid a decrease in performance.
Type of cable	Straight or crossed category 5 shielded twisted pair
Maximum cable length (daisy chain)	100 m (328 ft)
Transmission speed	10 MB/100 MB

Ethernet Network Port Wiring Terminal Characteristics

General

The main physical characteristics of Ethernet ports are:

Physical interface	Ethernet 10/100BASE-T
Connector	RJ45

Hardware Generations

MBTCP Generation hardware is an earlier implementation of the Ethernet based TeSys T product. It can be identified by the following characteristics:

There are no protocols labeled below the commercial reference number on the front face.
The LED closest to the Ethernet Ports is labeled “STS”.

MBTCP+EIP Generation hardware is the latest implementation of the Ethernet based TeSys T product. It can be identified by the following characteristics:

The words Ethernet/IP and Modbus/TCP appear below the commercial reference on the front face.
The LED closest to the Ethernet Ports is labeled “STS/NS”.

Physical Interface and Connectors

The LTMR controller is equipped with threeRJ45 ports on its front face. Two of these ports (circled below) provide access to the controller’s Ethernet network ports:

1 Ethernet port number 1

2 Ethernet port number 2

RJ45 Ethernet Network Connector Pinout

The LTMR controller is connected to the Ethernet network using either or both of its RJ45 Ethernet network port connectors in compliance with the following wiring:

The RJ45 wiring layout is:

Pin No.	Signal	Pair	Description
1	TD+	A	Transmit +
2	TD-	A	Transmit –
3	RD+	B	Receive +
4	Do not connect	–	–
5	Do not connect	–	–
6	RD-	B	Receive –
7	Do not connect	–	–
8	Do not connect	–	–

Auto-MDIX

Each RJ45 connector on the LTMR controller Ethernet network port is an MDIX (media-dependent interface crossover) interface. Each connector automatically senses the:

Cable type-straight or crossed-plugged into the connector, and
Pin requirements of the device to which the controller is connected

Using this information, each connector assigns transmit and receive functions to pin combinations 1 & 2 and 3 & 6 as necessary to communicate with the device on the other end of the cable.

NOTE: Auto-MDIX allows using either straight or crossed category 5 twisted-pair Ethernet cable to connect an LTMR controller to another device.

Cable Routing Practice

Installation Topology

The Ethernet adapter enables several wiring solutions:

• Daisy chain and/or Star topology

NOTE: To keep the integrity of Ethernet daisy chain network when one or more LTMR controllers are powered off, add an external permanent 24 Vdc power supply (not shown) to power the LTMR controller.

• Redundant ring topology with RSTP (with an RSTP switch)

The following figure shows the direct connection between the LTMR controller and PC.

Wiring of the Ethernet Network

Overview

This section describes how to connect an LTMR controller to an Ethernet network via the shielded RJ45 port.

Ethernet Wiring Rules

The following wiring rules must be respected in order to reduce disturbance due to EMC on the behavior of the LTMR controller:

Keep a distance as large as possible between the communication cable and the power or control cables (minimum 30 cm or 11.8 in.).
Cross over the Ethernet cable and the power cables at right angles, if necessary.
Install the communication cables as close as possible to the grounded plate.
Do not bend or damage the cables. The minimum bending radius is 10 times the cable diameter.
Avoid sharp angles of paths or passage of the cable.
Use the recommended cables only.
All RJ45 connectors must be metallic.
An Ethernet cable must be shielded:
- The cable shield must be connected to a protective ground.
- The connection of the cable shield to the protective ground must be as short as possible.
- Connect the shields, if necessary.
- Perform the grounding of the shield with a collar.
When the LTMR controller is installed in a withdrawable drawer:
- Connect all shield contacts of the withdrawable drawer part of the auxiliary connector to the ground of the withdrawable drawer to create an electromagnetic barrier. Refer to the Okken Communications Cabling & Wiring Guide (available on request).
- Do not connect the cable shield at the fixed part of the auxiliary connector.
Wire the bus between each connector directly, without intermediate terminal blocks.
The common polarity (0 V) must be connected directly to protective ground, preferably at one point only for the entire bus. In general, this point is chosen either on the primary device or on the polarization device.

For more information, refer to the Electrical Installation Guide (available in English only), chapter ElectroMagnetic Compatibility (EMC).

NOTICE
COMMUNICATION MALFUNCTION Respect all the wiring and grounding rules in order to avoid communication malfunctions due to EMC disturbance. Failure to follow these instructions can result in equipment damage.

Connection to the Network

Every LTMR controller includes an embedded two-port Ethernet switch, with two ports and one IP address.

NOTE: The two Ethernet ports have the same IP address.

The IEEE 802.3 standard defines Ethernet as implemented in the LTMR controller.

LTMR Controllers Installed in a Blokset or Okken Motor Control Switchboard

The installation of LTMR controllers in withdrawable drawers of a switchboard presents constraints specific to the type of switchboard:

For installation of LTMR controllers in an Okken switchboard, refer to the Okken Communications Cabling & Wiring Guide (available on request).
For installation of LTMR controllers in a Blokset switchboard, refer to the Blokset Communications Cabling & Wiring Guide (available on request).
For installation of LTMR controllers in other types of switchboard, follow the specific EMC instructions described in this guide and refer to the relative instructions specific to your type of switchboard.

Wiring Diagram Example

The wiring diagram below indicates how to connect LTMR controllers installed in withdrawable drawers to the Ethernet network via the RJ45 connector and hardwired cables.

1 Primary (PLC, PC, or communication module) with line terminator

2 Connexium Lite Managed Switch TCSESL043F23F0 (recommended), or Bypass Switch LTM9BPS

3 Ethernet shielded cable 590 NTW 000

4 Grounding of the Ethernet cable shield

5 Withdrawable drawer

6 Withdrawable drawer part of the auxiliary connector

7 Fixed part of the auxiliary connector