Rockwell-automation 1794-ID2 U.MNL INCREMENTAL ENCODER Instrukcja Użytkownika Pobierz pdf (Strona 58)

5–6 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Publication 1794ĆUM015B-EN-P - May 2001

DefinitionBitWord

Write

Word 1

0-15 (0-17) Control 0 - Control word for setting the function of counter 0.

Bits 00-02

02 01 00 Mode Selection bits

0 0 0 Counting on positive (rising) edge of input signal A. (Up/dwn counting determined by B.)

0 0 1 Quadrature encoder X1

0 1 0 Quadrature encoder X2

0 1 1 Quadrature encoder X4

1 0 0 Counting up on the positive edge of input signal A, and down on positive edge of input signal B.

1 0 1 No count function.

1 1 0 No count function.

1 1 1 No count function.

Bit 03 Preset (Reset) bit - A positive edge on this bit moves the value in Preset X to Counter X, independent of Preset

Enable. NOTE: To use Preset as Reset, use a count value of 0000 in the Preset value word.

Bit 04 Enable Z Preset bit - When this bit is set (1), a positive edge on Z preloads CounterX=Preset X, independent of

Cal Enable. NOTE: If Z is configured to do Store and Preset (Reset), the Store will occur first.

Bit 05 Count Enable bit - When this is set (1), the incremental encoder is enabled.

Bits 06-08

(06 10)

Calibration Control bits - bits 06, 07 and 08

(06

10)

06 Enable bit - When this bit is set (1), the counter can be calibrated.

07 Direction bit - When this bit set (1), calibration is performed in a negative direction; when reset (0),

calibration is performed in a positive direction.

08 Reset bit - Calibration is acknowledged and a new calibration is enabled on a positive edge on this bit.

Bits 09-10

(11 12)

10 09 Gate Control bits

(11

12)

0 0 No gate function on input G

0 1 Counting only if G is high (active)

1 0 Counting only if G is low (inactive)

1 1 The counter can be calibrated when G is high (active).

Bits 11-12

(13 14)

12 11 Store Control bits

(13

14)

0 0 Save the counter value on the positive edge of Z (if StoredX=0)

0 1 Save the counter value on the positive edge of G (if StoredX=0)

1 0 Save the counter value on the negative edge of G (if StoredX=0)

1 1 Save the counter value on the positive edge and negative edge of G (if Stored X = 0)

Bit 13 (15) Rollover bit - When set (1), the counter counts up to the preset and then restarts at 0. If this bit is reset (0) (not

rollover), the rollover preset value = FFFF (hex = 65535 (decimal).

Bit 14 (16) Store Reset bit - A positive edge on this bit resets Stored X in Signals.

Bit 15 (17) Preset Reset bit - A positive edge on this bit resets Preset Detected in Signals.

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 87 88

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Rockwell-automation 1794-ID2 U.MNL INCREMENTAL ENCODER Instrukcja Użytkownika Strona 58

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