Rockwell-automation 842SPA Serial to Parallel Adaptor Manual de usuario descargar pdf (Pagina 2)

Publication 75008–134–01(E)

Document 910 990 103 490

August 2001

Printed in Germany

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http://www.ab.com/sensors

Jumpers Needed

Connect the following three jumpers:

1. 842–SPA Ground (Terminal 1A) to Encoder Ground

(Terminal 1C)

2. 842–SPA Power (32C) to Encoder Power (32A)

3. 842–SPA Power (13C) to Parallel Output Driver Power

(31A)

Direction Control

When pin 12 of the encoder is connected to DC + (or left

floating), the 842A will count UP when the shaft is turned CW

when looking at the shaft. When pin 12 is connected to DC

return, the 842A will count UP when the shaft is turned in the

CCW direction when looking at the shaft.

Timing Diagrams

Below is an example of a timing diagram as viewed on an

oscilloscope. In this example, the 842A–31NB, a binary code

output with 4096 pulses per revolution and 4096 turns is

connected to an 842–SPA serial to parallel interface adaptor.

The 842–SPA generates an SSI clock burst of pulses. On the

positive slope of the start pulse, the 842A–31NB begins to

transmit its position data. In the example below, the

842A–31NB is returning 100000000011 (2051 Turns) and

001100000111 (775 position). After the data is sent, the output

remains in a low state for a short duration, then goes to a high

state in anticipation of the next SSI clock burst. The Error Bit

(bit 25) is normally zero. If there is a power interruption (e. g. –

low voltage) during data transmission, the Error Bit is set high.

TURNS

SHAFT POSITION

0000000001 1 11 11100 00000

...

BITS

VALUE

842–SPA

CLOCK +

842A

DATA +

423 6579 18

ERROR BIT

SSI

Dimensions

Use the figure below to locate the mounting holes of the 842–CH.

5.5

(0.22) Dia.

(1.18)

15 (0.59)

131

(5.16)

121

(4.76)

(1.77)

(0.95)

(2.99)

"A" Terminals

"C" Terminals

...9 7 5 3 131

...8 6 4 232

1 2

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Rockwell-automation 842SPA Serial to Parallel Adaptor Manual de usuario Pagina 2

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