1.FIFO_ RD复制表的顶部存储单元的值到输出参数Q中。然后必须有另外的逻辑程序输入数据到输入存储单元中。2.表中剩余的项复制到表中更低的位置。3.FIFO_ _RD将指针减1.4.FIFO_ RD执行时，步骤1，2和3重复执行，直到表为空(PTR=0)。当表满时指针首尾不重合。
WESTINGHOUSE 293B307A15 USPP 293B307A15
ALLEN BRADLEY 2711-K6C1L1 NSFP 2711K6C1L1
GLENTEK GA4552-4 USPP GA45524
CUTLER HAMMER C10GN3 USPP C10GN3
AMERITHERM 003-0028-1 USPP 00300281
BALDOR 712-510-110S001 NSFP 712510110S001
GENERAL ELECTRIC DS3800HMPJ1A1D USPP DS3800HMPJ1A1D
SQUARE D RC12V120 USPP RC12V120
FISHER ROSEMOUNT CL7011X1-A2 USPP CL7011X1A2
FANUC A16B-1211-0820 USPP A16B12110820
DENEX 51K1000 NSPP 51K1000
COGNEX 800-5714-1 NSPP 80057141
KISTLER INSTRUMENT 5859-A1 NSPP 5859A1
MODICON AS-516P-006 NSPP AS516P006
SQUARE D LC-26600AC USPP LC26600AC
ERLPHASE POWER TECHNOLOGIES 2100 NSFP 2100
