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Process Control Algorithms T8019

Issue 8 Sep 07 PD-T8019 9

1.2. BCD Translation

BCD

OUT

IP0

IP2

IP3

The BCD translation function requires the 4-bit BCD value represented as 4 Boolean parameters (IP0,

IP1, IP2, and IP3), IP0 being the least significant bit, IP3 the most significant bit. All four inputs must

be defined; inputs not required for specific application must be set to FALSE. M and N are of type

integer.

M specifies the value multiplier and must be a power of 10, i.e. 1, 10, 100, etc. N allows the BCD

functions to be cascade, by adding the value from a previous function. A value of -1 is assumed to be

the result of an up-stream conversion error and will result in all chained BCD functions generating

values of -1. The returned value OUT is an integer.

(

)

(

)

NMIP3IP2,IP1,IP0,BCDOUT +×=

Invalid BCD number (see table below) are to result in OUT = -1.

IP3

IP2

IP1

IP0

OUT

(with M=1 and N=0)

0 0 0 0 0

0 0 0 1 1

0 0 1 0 2

0 0 1 1 3

0 1 0 0 4

0 1 0 1 5

0 1 1 0 6

0 1 1 1 7

1 0 0 0 8

1 0 0 1 9

1 0 1 0 -1

1 0 1 1 -1

1 1 0 0 -1

1 1 0 1 -1

1 1 1 0 -1

1 1 1 1 -1

Table 2 BCD Translation

Multiple values (M) that are not powers of 10 are to result in a value of -1. If an overflow condition

occurs, the function is to return a value of -1 and increment the “Overflow”, error counter.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 27 28

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