Rockwell-automation 1771-IJ_IK IK ENCODER/COUNTER MODULES Bedienungsanleitung PDF herunterladen (Seite 51)

6–7Block Transfer Programming

Publication 1771ĆUM006B-EN-P - June 2002

PLCĆ3 Family Processors

Use the following ladder logic with PLC-3 or PLC-3/10 processors.

This program assumes that your application requires a single BTR

and BTW instruction to pass data between the processor and the

module.

Ladder logic alternates the execution of BTR and BTW instructions.

The processor checks data validity before accepting read data, and

sets one enable bit at a time.

Refer to Figure 6.5 for generalized ladder logic, and to Figure 6.6 for

example ladder logic with entered values.

Figure 6.5

Generalized Ladder Logic for PLCĆ3 Block Transfer

BTW

Data

Length

Cntl

XOR

A = BTR cntl

B = BTR cntl

R = BTR cntl

XOR

A = BTW cntl

B = BTW cntl

R = BTW cntl

PLC-3

Power

Loss

Bit

EQU

A = BTW cntl

B = BTR cntl

BTR

Data

Length

Cntl

BTW

15045

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Rockwell-automation 1771-IJ_IK IK ENCODER/COUNTER MODULES Bedienungsanleitung Seite 51