771x Series IO ASLS Replacement

TMI LLC I/O Systems Simulated Instrumentation Additional Hardware



771x Series


CPI/ASLS I/O Replacement





TMI has been providing I/O systems for the nuclear simulation industry for over 13 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. 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 771x-2 I/O system is an Ethernet based IO 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 in 9U VME size card cages. Each card cage can have 24 I/O cards (DO/DI/AO/AI). Any combination is acceptable. Connections on the DO/DI/AO/AI cards are through the P1/P3 connector. These are 64 pin DIN connectors using the A & C rows for the DO/DI and a single 64 pin DIN connector on the AO/AI. The termination to the customer equipment will use the same connectors as the original. This means there is no need for adapter boards.


Ethernet Controller Chassis

At the heart of the I/O system is the 7710-2 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 48 I/O cards (DO/DI/AO/AI).


Chassis Controller Chassis

The Chassis Controller Chassis (7711-2) 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 7712-1 DO cards are 64 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 on the P1 & P3 connector. These are 64 pin DIN style connectors using the A & C row.


DO Card with Isolated Drivers

The 7712-2 DO cards have 64 bits of output. The outputs are electrically isolated from the DO Card through photo isolation components. The outputs are open collector and used to drive devices up to 24 volts DC. They can directly drive LED’s, lamps and relays. The photo isolation insures complete electrical isolation between the customer equipment and the DO Card. All outputs are on the P1 & P3 connector. These are 64 pin DIN style connectors using the A & C row.


DI Card with Protected Inputs

The 7713-1 DI cards are 64 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 P1 & P3 connector. These are 64 pin DIN style connectors using the A & C row.


DI Card with Isolated Inputs

The 7713-2 DI cards have 64 bit DI’s that are electrically isolated between the customer equipment and the DI Card. The isolation is done via a photo isolation component. A low current is received from a DI (switch) which turns on the photo sensor and provides an active DI state. The inputs are internally pulled up. All inputs are on the P1 & P3 connector. These are 64 pin DIN style connectors using the A & C row.


Analog Input/Output Card

The 7714-1 is a 32 channel AO (analog output/ analog input). 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. The analog input range is -10 to 10 volts. The inputs are protected to 70 volts. The Analog Card uses a single 64 pin DIN style connector using the A & C rows.


Analog Output Card with Isolated Outputs

The 7714-2 has 32 isolated Analog Outputs. The AO range is set for a 1 -5 volt range. Each output sources and sinks +/-25ma. The AO’s use 16 bit DAC’s. The Analog Output Card uses a single 64 pin DIN style connector using the A & C rows.


Analog Input Card with Isolated Inputs

The 7714-3 has 32 isolated Analog Inputs. The AI is set for a 1 -5 volts range. Each input is protected up to 70 volts. The AI’s use 16 bit ADC’s. The Analog Input Card uses a single 64 pin DIN style connector using the A & C rows.


I/O Power Supply

The 7834-1 is a quad output 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 5” x 7” x 19” rack mount enclosure. A distribution board and 10 volt power source are mounted on the front side of the unit. The 10 volt power source is used as a power supply for the AI’s.


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. There is a DORT test that 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.


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




771x Series I/O Chassis