Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 156)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

9–8

Decode 4 to 1 of 16 (DCD)

When executed, this instruction sets one bit of the destination word. The particular

bit that is turned On depends on the value of the first four bits of the source word.

See the table below

Use this instruction to multiplex data in applications such as rotary switches,

keypads, and bank switching.

Source Destination

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

x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1

x 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0

x 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0

x 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0

x 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0

x 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0

x 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0

x 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0

x 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0

x 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0

x 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0

x 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0

x 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0

x 1 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0

x 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0

x 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Entering Parameters

•

Source is the address that contains the information to be decoded. Only the

first four bits (0–3) are used by the DCD instruction. The remaining bits may

be used for other application specific needs.

• Destination

is the address of the word where the decoded data is to be stored.

Updates to Arithmetic Status Bits

Unaffected.

Execution Times

(µsec) when:

True False

27.67 6.78

DCD

DECODE 4 to 1 of 16

Source

Dest

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 421 422

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