Rockwell-automation 1771-QB Linear Pos. Bedienungsanleitung PDF herunterladen (Seite 221)

Data Formats

Appendix H

H4

A sign bit is placed in each word to allow negative binary numbers even with

the first word zeroed. Simply signing the first word in this case would not work

in binary mode because a word with a value of zero and the sign bit on (i.e., a

negative zero) is not equal to zero in the 16-bit 2’s complement system.

If the first word of a negative number is zero, turn on the sign bit in the second

word. For negative numbers that use both words, the use of the sign bit in the

second word is optional (see example).

Table H.B gives several examples of how you would enter BCD and binary

positions.

Table H.B

Binary

and BCD Positions

Binary Format

BCD Format

Position

1st W

ord

2nd W

ord

1st W

ord

2nd W

ord

+60.000 in

60 0 0060 0000

+1524.00 mm

152 400 0152 0400

+0.999 in

0 999 0000 0999

+9.99 mm

0 999 0000 0999

60.000 in

60 0 8060

0000 or 8000

1524.00 mm

152

400 or 400

8152

0400 or 8400

0.500 in

0 500

0000 or 8000

8500

The Linear Positioning Module supports the full range of values from -32,768

to 32,767 in the second word of the setpoint position, positioning error and

zero-position offset parameters, when using binary format.

This flexibility means that you can often enter the same parameter value in

different ways. You must still use two words in binary format if your numbers

fall outside the 32,767 to -32,768 range.

For example, to enter a setpoint of 31.999 you could either:

enter the value 31 in the first word and 999 in the second

leave the first word zeroed and enter the value 31,999 in the second word

Both methods result in a setpoint value of 31.999.

Double Word Position Format

1 2 ... 216 217 218 219 220 221 222 223 224 225 226

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