774x Series IO Singer Replacement

TMI LLC I/O Systems Simulated Instrumentation Additional Hardware



774x Series


Singer 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 774x 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 3,000 I/O points. All the chassis are packaged like the original Singer version.


Ethernet Sub Controller Chassis

At the heart of the I/O system is the 7742-4 Ethernet Sub Controller. This Ethernet based device connects directly to the simulator computer and is responsible for the direct communication and control of all the I/O chassis in its string. The Ethernet Sub Controller replaces the original Sub Controller and communicates with the DO, RO/LO, DI and Analog Chassis.  A maintenance communication port is provided for running on line and off line diagnostics. The Ethernet Controller can directly drive 8 DO, RO/LO, DI and 6 Analog Chassis.


DO Chassis

The 7743-x DO Chassis are 256 bits. The DO Chassis is typically meant to drive low level TTL signals. The driver chips are socketed for ease of repair. All outputs mate directly with the original connector.



The 7744-x RO/LO Chassis are 256 bits. These chassis use intelligent driver chips. These provide a ground (low level) to the I/O point, typically used to drive lamps and relays. 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. All outputs mate directly with the original connector.


DI Chassis

The 7745-x DI Chassis is 288 bits 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 outputs mate directly with the original connector.


Analog Chassis

The 7746-x Analog Chassis are 3U sized card cages which contain both AO and AI cards. Each card cage can have up to 8 AO or AI cards. The AO cards have 16 outputs each and the AI has 32 inputs each, this is twice as dense as the original version. The analog output range is -10 to 10 volts. The analog input is also a -10 to 10 volt range. All outputs mate directly with the original connector.


I/O Power Supply

The 7766-3 is a 500 watt 24 volt AC/DC power supply 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 housed in a 3” x 7” x 19” rack mount enclosure. This distributed power brings 24 volts to all chassis. The chassis uses a DC/DC converter to generate the voltage required locally. This allows a single AC power supply to provide power for all the IO hardware minimizing the number of power supplies required.


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. It does not include wiring to the I/O panels.



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                                Energy Northwest

                        South Africa                              McGuire

                        VC Summer                             




7742-4 Ethernet Sub Controller