Rockwell-automation 1771-IR Series D RTD Input Module User Manual User Manual download pdf (Page 27)

3–5Module Programming

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Rungs 1 and 2 – Rungs 1 and 2 are the block transfer read and write

instructions. The BTR enable bit in rung 1, being false, initiates the

first read block transfer. After the first read block transfer, the

module performs a block transfer write and then does continuous

block transfer reads until the pushbutton is used to request another

block transfer write. After this single block transfer write is

performed, the module returns to continuous block transfer reads

automatically.

The PLC–5 program is very similar to the PLC–3 program with the

following exceptions:

• You must use enable bits instead of done bits as the conditions on

each rung.

• A separate control file must be selected for each of the BT

instructions. Refer to Appendix B.

Figure 3.3

PLC-5 Family Sample Program Structure

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Program Action

Rungs 1 and 2 – At power–up, the program enables a block transfer

read and examines the power–up bit in the BTR file (rung 1). Then,

it initiates one block transfer write to configure the module (rung 2).

Thereafter, the program continuously reads data from the module

(rung 1).

PLC-5 Program Example

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 78 79

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Rockwell-automation 1771-IR Series D RTD Input Module User Manual User Manual Page 27

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