767x Series IO-VMIC Replacement

TMI LLC I/O Systems Simulated Instrumentation Additional Hardware


767x Series I/O


VMIC I/O Replacement




TMI has been providing I/O systems for the nuclear simulation industry for over 18 years. TMI offers many types of I/O systems as upgrades for simulators as well as newly built simulators. TMI has direct replacements for Singer (all versions), EAI, CPI, VMIC 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. The 767x series is a direct replacement for VMIC IO systems.


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 but are also installed in fossil simulators. TMI’s focus is devoted to the simulation industry.


Hardware Description

The 767x I/O system is an Ethernet based IO system. It has an industry standard TCP/IP protocol. Each Ethernet Controller can handle over 4,000 I/O points. All the chassis are packaged in 6U 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 compatible with the original connectors and require no adapter boards.


Ethernet Controller Chassis

At the heart of the I/O system is the 7670-1 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 the Ethernet Chassis assembly.  A maintenance communication port is provided for running on line and off line diagnostics. The Ethernet Controller can directly drive up to 32 I/O cards (DO/DI/AO/AI). Snap Shot registers and displays are part of the chassis to capture data as an aid in troubleshooting. Any type of IO point can be captured and displayed. A diagnostic communication port is also part of the 7670-1. This allows both on line and off line testing of IO cards and panel points through a serial or network terminal.


Chassis Controller Chassis

The Chassis Controller Chassis (7671-1) is a satellite chassis of the Ethernet Controller Chassis. This Chassis connects directly to the Ethernet Chassis over a 40 pin local bus known as the Chassis Bus. The Chassis Controller is located in the first slot of the card cage assembly.  Snap Shot registers and displays are part of the chassis to provide a capture of IO data for an aid in troubleshooting. Any type of IO point can be captured and displayed.


DO Card with Intelligent Drivers

The 7672-1 DO cards have 128 DO points. They can be configured as either sink drivers or source drivers. In either configuration, “intelligent drivers” are used to drive panel points.  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 and are self protecting. They can directly drive LED’s without ghosting. TMI offers 3 options for the DO Board, these include high current sink drivers (up to 1 amp), high voltage source drivers (up to 35 volts), and TTL level outputs as either high true or low true states. The high current sink drivers have a maximum working voltage of 60 volts and 1.0 amp. The high voltage source drivers provide a maximum output driving voltage of 35 volts at 350ma. The TTL drivers are TTL levels at +/-24ma. All outputs are compatible with the VMIC DO card connectors.


DI Card with Protected Inputs

The 7673-1 DI cards are 128 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. The IO connectors are compatible with the VMIC DI Card connectors.


Analog Output Card

The 7674-1 is a 32 channel AO (analog output). The AO can be selected 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 IO connectors are compatible with the VMIC AO Card connectors.


Analog INput Card

The 7675-1 has 32 Analog Inputs. The AI range is set for a 0-10 volts. The 10 volt supply is provided by the IO power supply. Each input is protected up to 70 volts. The AI card uses a 16 bit ADC’s. The IO connectors are compatible with the VMIC AI Card connectors.


I/O Power Supply

The 7834-2 is a quad output AC/DC power supply chassis. The input voltage is 85 to 264VAC. The input contains an 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 Online and 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. Some of these tests can be run in conjunction with training. The Ethernet Controller has both online and offline tests. There is a DORT test that is self contained in the Ethernet Controller. 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, DI Test and Synchroscope Test (used with the TMI Synchroscope Controller). The online tests are “Preset and Monitor” tests. This allows the user to Preset an AO or DO or Monitor an AI or DI while the simulator is on line.


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





767x Series I/O Chassis