Siemens SIMATIC TI505 Service Manual download pdf (Page 56)

Understanding Module Operation

3-4

High Speed Counter Encoder Module User Manual

3.2 Data Formats

The

current count value for each 24-bit counter is contained in two word

inputs (for example, WX1 and WX2).

•

The count range is from 0 to 16,777,215 in unipolar mode.

•

The count range is from +8,388,607 to –8,388,608 in bipolar mode.

•

Overflow and underflow occur at the 0 value.

able 3-2 shows the word format for the current count and Holding Register

values for the 24-bit counters (Counters 1 and 4).

able 3-2

24-Bit Count V

alue For

mat

Word MSByte LSByte

MSWord 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

LSWord 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

The count values for Counters 1 and 4 are contained in the following words:

•

Counter 1:

Count value:

WX1 and WX2

•

Counter 4:

Count value:

WX5 and WX6

The Holding Registers for Counters 1 and 4 are the following words:

•

Counter 1: Holding Register 1: WX9 and WX10

Holding Register 2: WX1

1 and WX12

•

Counter 4: Holding Register 3: WX13 and WX14

Holding Register 4: WX15 and WX16

ou can select one of the following two’

s-complement formats to express the

unipolar and bipolar word values:

•

32-bit signed integer format:

smmmmmmm mmmmmmmm mmmmmmmm mmmmmmmm

•

Double 16-bit signed integer format:

saaaaaaa aaaaaaaa sbbbbbbb bbbbbbbb

where the numeric value is calculated as:

( (saaaaaaa aaaaaaaa) *32768 + (sbbbbbbb bbbbbbbb) )

Curr

ent Count and

Holding Register

Count V

alue

Formats

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 126 127

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Siemens SIMATIC TI505 Service Manual Page 56

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