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A

FRD Source A D10:5 Dest. F8:2

TOD(value,destination) -convert from BCD to binary

FRD(value,destination) -convert from binary to BCD

DEG(value,destination) -convert from radians to degrees

RAD(value,destination) -convert from degrees to radians

Figure 15.9 Conversion Functions

Examples of the conversion functions are given in Figure 15.10. The functions load in a source value, do the conversion, and store the results. The TOD conversion to BCD could result in an overflow error.

plc basic functions -15.11

Addr. Before after

N7:0 0 1793

N7:1 548 548

F8:0 3.141 3.141

F8:1 45 45

F8:2 0 180

F8:3 0 0.785

these are shown in

D9:0 0000 0000 0000 0000 0000 0101 0100 1000 binary BCD form

D9:1 0001 0111 1001 0011 0001 0111 1001 0011

Figure 15.10 Conversion Example

15.2.4 Array Data Functions

Arrays allow us to store multiple data values. In a PLC this will be a sequential series of numbers in integer, floating point, or other memory. For example, assume we are measuring and storing the weight of a bag of chips in floating point memory starting at #F8:20 (Note the ’#’ for a data file).

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