The Fairfax County Board of Supervisors, irked by what it called Virginia Gov. Charles S. Robb's inattention, voted yesterday to suspend meetings of its task force on the governor's highly touted $30.2 million Center for Innovative Technology (CIT) near Dulles International Airport.

The supervisors said the state promised landowners near the center that it would attract development, but it has yet to promise improvements to the roads in the area. The center is supposed to help develop ideas for high-tech firms.

"When the governor created this child, it was a beautiful child," said County Board Chairman John F. Herrity, "but now it seems to be an orphan."

The unanimous vote, led by the board's new five-member Republican majority, came on a day when the supervisors also replaced several Democratic supervisors serving on transportation panels with Republicans, agreed to meet with D.C. Mayor Marion Barry over the troubled Lorton Reformatory and urged the state to study the possibility of adding a third lane for car pools on I-66 between Rte. 123 and Prince William County.

"The CIT is not the problem," said Supervisor Nancy Falck (R-Dranesville), who urged the board to suspend the meetings of the task force. "The problem is the agreement the state and private landowners made to support some level of development around the CIT."

Robb announced last May that the center would be located on a site straddling the Fairfax-Loudoun county border. He said at the time that the center would substantially increase the value of the adjacent land.

Falck said she wanted a clarification from the state on how it intends to improve the roads there before the task force resumes its planning sessions. The board adopted her resolution unanimously, with Falck and other supervisors saying that the roads in the area, principally Sully Road (Rte. 28), cannot accommodate any significant development without improvement.

The Fairfax board also voted unanimously to approve plans for a multimillion-dollar facility for the elderly in Reston, which would include a number of local government programs as well as nursing homes and residences. Construction on the project, which would cost more than $10 million, is scheduled to start this summer.

County Board Vice Chairman Martha V. Pennino (D-Centreville), who announced plans for the complex, said the county plans to give 26 acres of land to the private, nonprofit Fairfax Hospital Association, which will build and operate the facility. The association is building a 160-bed hospital at Rte. 50 and I-66, about six miles from the proposed complex. It also operates two hospitals in Fairfax County and one in Fairfax City, in addition to a 24-hour emergency facility at the proposed site.

Pennino said the facility is designed to meet the needs of the fast-growing elderly population in northern Fairfax County. "There's been a loud cry by the elderly in the Reston-Herndon area," she said. "More and more families are caring for their own elderly . . . and they need respite."

Donald L. Harris, the senior vice president of the association, said the first phase of the project, which would cost about $10.5 million, is scheduled for completion by August 1986. He said financing for the complex would come in part from the association's reserves and in part from loans.

The board also voted to meet with Barry Thursday to clarify procedures governing the District's notification of the county in the event of disturbances or escapes at Lorton Reformatory. Fairfax officials attacked the District last week for failing to notify the county promptly of an escape from Lorton Thursday night.

Supervisors also asked the state to study using the shoulder of I-66 between Rte. 123 and the Prince William County line as a third lane. Herrity also suggested making one lane of that stretch of the highway a car pool lane.

In their first overtly partisan action, the five-member Republican majority voted to replace three Democrats serving on the Northern Virginia Transportation Commission with three Republican supervisors. James M. Scott, the Democratic supervisor who served as an alternate to the Metro board, was also replaced with Falck, a Republican.

The board also approved about $8 million for mid-year expenses, but by a pair of 5-to-4 votes it defeated proposals to contribute $100,000 each to Wolf Trap Farm Park, the performing arts center in the county, and to a historic railway station being rebuilt.

Even after paying those expenses, the county is projecting a $7.4 million surplus at the end of the fiscal year June 30.