Rockwell-automation 2711 PANELBUILDER SOFTWARE USER MANUAL Uživatelský manuál stáhnout pdf (Strana 93)

100

101

Planning Your Application

Chapter 4

4-18

Each group of 4 bits represents the equivalent of 1 digit in a numeric

value display.

Example: BCD Values or States

If you configured a BCD data value to have a maximum of 16 states (2

digits), then the assigned address would be an 8-bit contiguous string

with 4 bits for each digit.

2 digits @ 4 bits each = 8 bits

If a numeric value display was configured to have a range from 00000

to 99999 (5 digits), then the assigned address would be a 20-bit

contiguous string with 4 bits for each of the 5 digits.

5 digits @ 4 bits each = 20 bits

Since a PLC word can only support 16 bits, an additional word is

required for the additional 4 bits.

When more than one PLC word is required to support the required

number of digits, all remaining digits will extend into the next higher

word. Taking another example, BCD value 123456 would be

represented in two PLC words as follows.

Table 4.G

BCD

Format

Bit Numbers 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0

Word X 3 4 5 6

Word X+1 1 2

Table 4.H shows the number of bits required for different numbers of

BCD digits:

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 467 468

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