NY -- Standard&Poor's CreditWire 3/14/97 -- Standard&Poor's today has assigned its double-`A'-minus rating to Archer Daniels Midland Co.'s $350 million 7.5% notes due 2027. The corporate credit rating is double-`A'-minus. The rating reflects Archer Daniels' record of strong earnings and cash flow, despite operating in commodity-related businesses. Profitability is expected to improve, while Archer Daniels maintains a conservative financial posture and a sizable cash and securities portfolio. As an efficient processor of oilseeds and corn, as well as a variety of other commodities, Archer Daniels has steadily built up its position as an important material supplier to food and beverage companies, as well as to farmers. Investments in low-cost production capacity and moderately priced acquisitions use