Rockwell-automation 1771-QB Linear Pos. Manual do Utilizador descarregar pdf (Página 88)

Formatting Module Data (WRITES)

Chapter 7

79

Important: If you change the axis polarity, exchange the forward and reverse

analog calibration constants. The zero-position offset defines the direction of

forward and reverse motion.

Calculate the zero-position offset by measuring the distance between the

zero-position and the transducer’s head, as shown above. The module accepts a

maximum of +

799.900 inches (+7999.00 millimeters). The sign defines whether

the transducer head is on the positive or negative end of the axis. If the

zero-position offset is zero, then the positive direction is away from the

transducer head, in the extend direction.

Figure 7.7

ZeroPosition

Offset W

ords

50029

Zeroposition offset,

BCD or binary

799.900 inches or 7999.00 mm max

Most significant digits

Sign:

0 = +

1 = -

Sign:

0 = +

1 = -

Least significant 3 digits

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

15 14 13 12 11 10 09 08 07 06 05 04

03 02 01 00

Important: If you select binary format, both words are represented as

2’s-complement integers compatible with the PLC-5. See Appendix H for

examples of these words.

Software Travel Limits (words 9, 10 and 38, 39)

When a setpoint command calls for the axis to move beyond a software travel

limit, the module aborts the move and reports a programming fault. When a jog

command calls for the axis to move beyond a software travel limit, axis

movement will decelerate and stop at the limit.

The software travel limits must be within the active range of the transducer. The

active range of your transducer is halved by each increase in the number of

circulations of your digital interface box.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 225 226

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