770x Series I/O EAI Replacement

TMI LLC I/O Systems Simulated Instrumentation Additional Hardware



770x Series I/O


EAI I/O Replacement




TMI has been providing I/O systems for the nuclear simulation industry for nearly 20 years. TMI offers many types of I/O systems as replacements for simulators. TMI has direct replacements for Singer (all versions)/EAI, CPI and RTP I/O systems, CAE and VMIC. TMI’s direct replacement I/O systems reduce the workload when upgrading as well as eliminates the need for cable adapters.


TMI has become the leader in the U.S.A. for I/O systems within the nuclear simulation market, in fact TMI delivers more I/O systems then all other vendors combined. TMI’s reputation has grown worldwide and as such, has been supplying I/O systems to Europe, Asia and Africa. TMI’s products are used predominately in the nuclear simulation industry and also have been used in fossil simulation. TMI’s focus is devoted to the simulation industry.


Hardware Description

The 770x I/O system is an Ethernet based distributed I/O system. It has an industry standard TCP/IP protocol. Each Ethernet Controller can handle over 2,000 I/O points. All the chassis are packaged in 3U VME size card cages. Each card cage can have 16 I/O cards (DO/DI/AO/AI). Any combination is acceptable. Connections on the DO/DI/AO/AI cards are through the P2 connector. The P2 is a 44 pin board edge connector.


Ethernet Controller Chassis

At the heart of the I/O system is the 7685-1 Ethernet Controller. This Ethernet based device connects directly to the simulator computer and is responsible for the direct communication and control of all the IO cards within the chassis. The Ethernet Controller is located in the first slot of every card cage assembly.  A maintenance communication port is provided for running on line and off line diagnostics. The Ethernet Controller can directly drive up to 128 I/O cards (DO/DI/AO/AI).


Chassis Controller Chassis

The Chassis Controller Chassis (7686-1) is a satellite chassis of the Ethernet Controller Chassis. This Chassis connects directly to the Ethernet Chassis over a 40 pin bus know as the Chassis Bus. The Chassis Controller is located in the first slot of the card cage assembly. 


DO Card with Intelligent Drivers

The 7702-1 DO cards are 16 bits and use intelligent driver chips. The most common DO card uses sink drivers. These provide a ground (low level) to the I/O point, typically used to drive lamps and relays. The driver chips are socketed for ease of repair. These drivers sense over current and over temperature and reduce their output so they do not exceed the components parameters, in other words when they sense an out of tolerance condition they reduce their output current and protect themselves. They can directly drive LED’s without ghosting. TMI offers 3 options for the DO Board, these include high current/voltage sink drivers, and TTL level outputs as either high true or low true states. The high current drivers have a maximum working voltage of 60 volts and 1.0 amp. The TTL drivers are TTL levels at +/-24ma. All outputs are located on the P2 connector. This is a 44 pin card edge connector.


DI Card with Protected Inputs

The 7703-1 DI cards are 16 bit DI’s and senses a low level to go to the true state. The inputs are internally pulled up to 15 volts and when driven below 5 volts the input is active. The inputs are protected to +/-36 volts. All inputs are on the P2 connector. This is a 44 pin card edge connector.


Analog Output Card (VOLTAGE)

The 7704-1 is a 8 channel voltage AO (analog output). The AO can be set for up to 4 output ranges, (0-5 volts, -5 to 5 volts, 0 to 10 volts and -10 to 10 volts). The AO’s use 16 bit DAC’s and source and sink +/-20ma. All outputs are on the P2 connector. This is a 44 pin card edge connector.


Analog input Card

The 7705-1 has 16 Analog Inputs. The AI is set for a 0-10 volt range. Each input is protected up to 70 volts. The AI’s use 16 bit ADC’s. All inputs are on the P2 connector. This is a 44 pin card edge connector.


I/O Power Supply

The 7852-2 is a AC/DC power supply chassis mounted to the rear of the chassis. The input voltage is 85 to 264VAC. The input contains an inline circuit breaker, line filter and on/off switch. The power supply is attaches to the back end of the card cage.


Hardware Offline tests

TMI I/O systems provide the user with both online and offline tests. These tests allow the hardware personal to locate problems quickly. A DORT test is self contained in the Ethernet Controller. It does not require a PC to run. This is useful to verify the simulator as a whole or a section of panel. DORT tests consist of Lamp Step, AO Sweep, AO Set, AO Step, DI Test and Synchroscope Test. The online tests are “Preset and Monitor” tests. This allows the user to Preset an AO or DO or Monitor an AI or DI.


Hardware Requirement

The computer system used to drive the I/O must have an Ethernet (10/100 minimum) connection with TCP/IP. A 10/100/1000 switch is recommended.



The system comes with a five (5) year warranty.



TMI can provide installation assistance if necessary. The installation includes mounting and cabling all the hardware supplied by TMI.



All TMI customers are self maintainers. They need the documentation to perform their maintenance. All schematics, technical manuals are provided.


Customer Base

TMI upgrades more nuclear simulators than all other hardware vendors combined. Nuclear simulation is the heart of TMI’s business.  Below is a list of some of TMI I/O users.


Seabrook Station                      Monticello

Vermont Yankee                        Peach Bottom

Nine Mile Point                          Grand Gulf

Fitz Patrick                                ANO

Northeast Utilities                      River Bend

Limerick                                    Vogtle

Hatch                                        Three Mile Island

Farley                                       KSU Sweden

Beaver Valley                            Detroit Edison

Perry                                        DC Cook

Ginna                                        Palisades

Oconee                                     Clinton

Surry                                        North Anna

TXU                                          STP

Indian Point                               Kewaunee

Point Beach                              Taiwan Electric Power Co.

Robinson                                  Korea Electric Power Co.

Waterford                                 LaSalle

Shearon Harris                          Bruce Power Canada

Wolf Creek                                Byron

Cooper                                     Calvert Cliffs

Oyster Creek                             Dresden

Hope Creek                               Salem

Braidwood                                PPL

TVA                                          NRC

Quad Cities                               Laguna Verde

LNPP                                        Mochovce (Slovakia)

Palo Verde                                LNPP (Russia)

Energy Northwest                      South Africa (fossil and nuclear)

VC Summer                              McGuire




770x Series I/O Chassis