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Nuclear Sensors & Process Instrumentation
(Formerly Weed Instrument)

Available Services
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Fiber Optic Modems

The industrial fiber optic networking product line of NSPI was established through the acquisitions of Apec Electronics in 1991 and the EOTec business of the 3M Company in 1994.

Over the years NSPI has continued to invest in the development of these products by adding new protocols, features and capabilities. NSPI was the first company to receive Factory Mutual (FM) hazardous area certification for fiber optic modems. In addition, we pioneered the development of Self-Healing Ring technology which provides high reliability, media redundant PLC/DCS communications (Patent #6,307,652). Recently, NSPI introduced the EOTec 2104 Ethernet Ring Switch which provides an economical solution to the combination of high performance ring redundancy with Ethernet communications.
EOTec 2000 series

The EOTec 2000 Fiber optic modems are a family of modules designed to take traditional copper networks, convert them to fiber optic signals, and convert them back again. All modules fit on standard 35mm DIN rail and each has an integrated backplane. As a result, there is no separate backplane to purchase and no external wiring between modules. Simply attach each module to the DIN rail and slide them together until they mate to one another.

The EOTec 2000 series represents an extremely flexible and scalable solution to the problems often encountered when using copper to interconnect communication nodes. Both multi-mode and single-mode fiber optic links are supported. Options are available to support all the popular fiber optic connectors (ST, SMA, SC), providing users the ability to construct dependable and robust networks.

Problems such as ground loops, isolation and lightning strikes are eliminated with the EOTec 2000 fiber optic modems. Fiber optic communication links can also be extended over much greater distances and take on physical topologies not available with copper networks. For instance, star and self-healing ring topologies are impossible when using copper interconnects. These configurations are easily achievable with the EOTec 2000.
Inter-module communications and power distribution is handled by the internal EOTec 2000 BUS architecture to minimize external wiring.
Each node can support up to five (5) EIMs or OIMs to suite the application. The EOTec system allows the user to build a fiber optic system that supports several network topologies, including:

  • Point-To-Point
  • Daisy-chain
  • Star
  • Self healing ring
  • Dual self healing ring
EOTec 2000 application hints:
  • Each cluster can have a maximum of five communication modules (power supplies not included).
  • Each cluster must have one (and only one) module set to Master (M). Any additional modules sharing a common backplane with the Master must be set to a numerical address (1, 2, 3 or 4). Numerical addresses cannot be repeated in a single cluster.
  • When employing a self-healing ring configuration, the self-healing ring module is hardwired as Master. The electrical interface module must be set to “1” and the adjacent modules must be set to “2” and “3”.
  • The default setting for the optical transmit power is “H” (high); this setting should not be adjusted unless an optical overdrive situation occurs.
  • Pay attention to the terminations on the electrical interface modules. Modules without internal termination can be used anywhere along a copper segment. Modules with internal termination must be used at the end of copper segments only.

Constructing fiber optic communication nodes is very easy if the user keeps a few simple guidelines in mind. At a very minimum, every fiber optic node will require a power supply module (PSM), electrical interface module (EIM) and optical interface module (OIM).

 
Industrial Fiber Optics


click to enlarge

 

Weed Instrument is the world’s leading manufacturer of Fiber Optic Networking Equipment for Industrial Automation & Process Control applications.

  • Over three decades of experience in fiber optic networking technology.
  • Weed Instrument offers the world’s largest selection of fiber optic converters for PLC’s and Distributed Control Systems.
  • Weed provides Fault Tolerant, Multidrop, and Fiber Optic Communications solutions.

Options:

  • Industrial Ethernet, Profibus, Modbus, Modbus Plus, ControlNet, DeviceNet, Data Highway Plus, DH-485, Genius, Remote I/O, RS232/484, Reliance R-Net
  • Analog: 4-20mA, 0-10V
 
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Electrical Interface Modules (EIMs)

Connect to your PLC devices and/or fieldbus networked equipment.

The Electrical Interface Module (EIM) is connected to the copper communication link. The module receives signals from the copper link, conditions them and makes the signals available to the backplane for conversion. The EIM also accepts signals from the backplane and transmits the signals to the attached copper link. EIM part numbers always begin with 2C. It is important to select the correct EIM for the copper protocol being converted. For example, the 2C02 is the model which is compatible with GE Fanuc networks.

Key selection criteria:

  • What communication protocol is being converted?
  • What is the baud rate?

Selection guide:

Electrical Interface Modules
Model PLC / Fieldbus Data sheet (click to view)
2C02 GE Fanuc Genius® 2C02
2C07 Reliance R-Net & I/O 2C07
2C10 RS-232 or RS-485, Half Duplex 2C10
2C12 Allen-Bradley DH+® & Remote I/O 2C12
2C14 Modicon® (S908) Remote I/O 2C14
2C15 Allen Bradley DH-485 2C15
2C20 ControlNet® (view all ControlNet products) 2C20
2C22 Profibus-DP 2C22
2C23 Profibus-DP w/ Self-Healing Ring & 24VDC pwr 2C23
2C29 Modicon® Modbus Plus® 2C29
 
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Fiber Optic Interface Modules (OIMs)

Build a fiber based network using Single Mode or Multi-Mode Fiber Cables in a variety of topologies.

Key selection criteria:

  • Is the fiber optic cable single mode or multi-mode?
  • What types of connectors terminate the fiber optic cable? (ST or SMA)
  • What is the total loss on the fiber optic link? (This number must be less than the optical budget of the OIM selected)
  • Is fiber link monitoring desirable?

Selection Guide:

Optical Interface Modules
without diagnostic output

Optical Dynamic Range by fiber cable type

Data Sheets (click to view)

Connector

Wavelength

Mode

200/ 230µm

62.5/ 125µm

9/125µm

2E06

SMA

850nm

Multi

21dB

2E07

ST

850nm

Multi

21dB

12dB

2E09

ST

1300nm

Multi

12dB

2E10

ST

850nm

Multi

23dB

17dB

2E36

ST

1300nm

Single

10dB

2E46

ST

1300nm

Single

16dB

Optical Interface Modules
with diagnostic output

Optical Dynamic Range by fiber cable type

Data Sheets (click to view)

Connector

Wavelength

Mode

200/230µm

62.5/125µm

9/125µm

2D06

SMA

850nm

Multi

21dB

2D07

ST

850nm

Multi

21dB

12dB

2D09

ST

1300nm

Multi

12dB

2D10

ST

850nm

Multi

23dB

17dB

2D36

ST

1300nm

Single

10dB

2D46

ST

1300nm

Single

16dB

Diagnostic output feature:

2Dxx optical modules provide a full diagnostic output (4-20mA). The output is internally powered and is proportional to the received optical power. The output can be monitored and processed continuously in order to insure the integrity of the fiber optic link. This is beneficial for critical applications such as subsea networking where degradation of the optical signals can be detected before a complete loss of communication occurs. An output less than 4mA indicates loss of optical signal. A pluggable screw terminal connection on the bottom front of the module provides easy access to the output signal.
 
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Self-Healing Ring Module (SHRM)

The use of fiber optic versus copper communications cable provides many advantages in industrial control applications. These include EMI/RFI immunity, the ability to easily run the cable through hazardous areas and long distance communications runs. Another important benefit is the ability to achieve media redundancy without incurring the cost of duplicate hardware systems.

By using the NSPI Self-Healing Ring solution, a critical system can achieve uninterrupted communications, even in the event of a failure in the fiber optic communications lines.

How the Self-Healing Ring works:

The NSPI Self-Healing Ring Module (SHR) provides fiber media redundancy when utilized in each node or drop of a fiber optic ring network. Data will always be routed on the shortest possible path to reduce propagation delay through the system. The SHR accomplishes this by creating a “virtual” break in the ring at the link farthest from the originating node. In the above illustration, if Node 1 is the originating node of a message, a virtual break will be created on the fiber link B or C (B is shown here). This virtual break is created on a packet by packet basis. Therefore, the network behaves as if it were in a Daisy Chain, preventing the delivery of the same packet to any node twice.

When a real fiber break actually does occur, the SHR devices detect the break and a virtual break is no longer created since the real fiber break has performed the function of putting the system into a Daisy Chain. The SHR automatically resets when the fiber path has been restored. Visible LED indicators in conjunction with relay contacts provide local and remote monitoring of the integrity of the fiber optic network.

Model 2C30 Series Self-Healing Ring module:

The 2C30 supports Self-Healing Ring applications in conjunction with any Electrical Interface Module (EIM) for GE Fanuc Genius®, Reliance R-Net & I/O, RS-232 or RS-485, Allen-Bradley DH+® & Remote I/O, Modicon® (S980) Remote I/O, Allen Bradley DH-485, or Modicon® Modbus Plus®. The Self-Healing Ring function is built into the Electrical Interface Module for Profibus (2C23). Consult our factory for ControlNet self healing ring applications.
  Click here to view data sheet Click here for more information
Power Supply Modules (PSMs)

Key selection criteria:

  • Will AC or DC power be available at the installation site?
  • Is redundancy required?

Module selection guide:

Part no: Data sheet (PDF) (click to view) 2A06 2A16 2A08 2A18
Nominal input voltage: 120/240 VAC at 50/60 Hz & 125 VDC 120/240 VAC at 50/60 Hz & 125 VDC 24VDC 24VDC
Input current: 250mA 250mA 400mA 400mA
Input fuse: 400mA
Slow-blow
400mA
Slow-blow
400mA
Slow-blow
400mA
Slow-blow
Regulated output power: 9VDC
1.1A Max.
9VDC
1.1A Max.
9VDC
1.1A Max.
9VDC
1.1A Max.
Alarm relay: No Yes (1) No Yes (1)
Indicators: Power On
(Green LED)
Power On
(Green LED)
Power On
(Green LED)
Power On
(Green LED)
Operating temperature: -40 to 85°C -40 to 85°C -40 to 85°C -40 to 85°C
Operating rel. humidity: 0 to 90%
non-cond.
0 to 90%
non-cond.
0 to 90%
non-cond.
0 to 90%
non-cond.
Height: 3.9 inches 3.9 inches 3.9 inches 3.9 inches
Width: 1.8 inches 1.8 inches 0.9 inches 0.9 inches
Depth: 4.9 inches 4.9 inches 4.9 inches 4.9 inches
CE mark Yes Yes Yes Yes
UL/cUL recognized component Yes Yes No No
UL/cUL listed for Class I, Div. 2 Hazardous Locations No No Yes Yes
FM approved for Class I, Div. 2 Hazardous Locations No No Yes Yes

Note (1): Alarm contact – 1ea. Form C, 175VDC, 1 Amp continuous

 
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EOTec 2000 Fiber Optic Network Topologies

The EOTec system supports multiple network topologies that allow users to distribute their PLC and fieldbus communications in configurations typically not supported by the native “copper” version of the same network. Use the links below to explore the possibilities:

Optical Repeater

Optical Repeater

In this example, each EOTec 2000 node includes:
•Two (2) EOTec Fiber Optic Modules
•An EOTec Power Supply Module

Point to Point configuration

Point to Point configuration

In this example, each EOTec 2000 node includes:
•One (1) EOTec Fiber Optic Modules
•One (1) or more EOTec Electrical Interface Modules
•An EOTec Power Supply Module

Linear Drop / Daisy Chain configuration

Linear Drop / Daisy Chain configuration

In this example, the EOTec 2000 nodes at the extreme ends of the network include:
•One (1) EOTec Fiber Optic Interface Modules
•One (1) or more EOTec Electrical Interface Modules
•An EOTec Power Supply Module

The other EOTec 2000 node(s) on the network include:
•Two (2) EOTec Fiber Optic Interface Modules
•One (1) or more EOTec Electrical Interface Modules
•An EOTec Power Supply Module

Star configuration

Star configuration

In this example, the central EOTec 2000 node includes:

Four (4) EOTec Fiber Optic Interface Modules, one (1) EOTec Electrical Interface Module, plus an EOTec Power Supply Module.

Each of the EOTec 2000 satellite nodes use one (1) EOTec Fiber Optic Interface Module, one (1) EOTec Electrical Interface Module, plus an EOTec Power Supply Module.

Up to five optical modules can be cascaded in one modem node to establish an optical star network system

Self-Healing Ring

Self-Healing Ring

•Two (2) EOTec Fiber Optical Interface Modules
•One (1) EOTec Self-Healing Ring Module
•One (1) EOTec Electrical Interface Modules
•An EOTec Power Supply Module
•ControlNet Single and Dual Self-Healing Rings

Note: In an EOTec 2000 Self-Healing Ring Topology, you can only have one (1) Electrical Interface Module per node.

 
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CTH Controls Inc.   CTH Controls Inc.
6-1500 Upper Middle Rd. W. Suite 220
Oakville, ON, Canada, L6M 0C2
Phone: 905-792-6829
Toll Free: 1-888-550-6829
Fax: 905-792-6902
sales@cthcontrols.com
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