Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 175)

100

101

Using Data Handling Instructions

9–27

LFL Instruction

When rung conditions change from false-to-true, the controller sets the LFL enable

bit (EN). This loads the contents of the Source, N7:10, into the stack element

indicated by the Position number, 9. The position value then increments.

The LFL instruction loads an element at each false-to-true transition of the rung,

until the stack is filled (34 elements). The controller sets the done bit (DN),

inhibiting further loading.

LFU Instruction

When rung conditions change from false-to-true, the controller sets the LFU enable

bit (EU). This unloads data from the last element loaded into the stack (at the

position value minus 1), placing it in the Destination, N7:11. The position value

then decrements.

The LFU instruction unloads one element at each false-to-true transition of the rung,

until the stack is empty

. The controller then sets the empty bit (EM).

Programming

Execution Times

(µsec) when:

True False

61.13 33.67

64.20

Execution Times

(µsec) when:

True False

35.08

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 421 422

Comentarios a estos manuales

Sin comentarios

Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario Pagina 175

Comentarios a estos manuales

Relacionado con productos y manuales para Equipo Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers