Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario descargar pdf (Pagina 24)

Module Programming

Chapter 4

47

Scan time is defined as the amount of time it takes for the input module to read

the input channels and place new data into the data buffer. Scan time for your

module is shown in Figure 4.4.

The following description references the sequence numbers in Figure 4.4.

Following a block transfer write “1” the module inhibits communication until

after it has configured the data and loaded calibration constants “2”, scanned the

inputs “3”, and filled the data buffer “4”. Write block transfers, therefore,

should only be performed when the module is being configured or calibrated.

Any time after the second scan begins “5”, a BTR request “6” can be

acknowledged.

When operated in real time sample mode (RTS) = 00, a BTR may occur at any

time after “4.” When operated in RTS = T, a BTR will be waived until ”T”

milliseconds, at which time 1 BTR will be released.

Figure 4.4

Block

ransfer T

ime

Block

Transfer

Write

Time

End of

Block

Transfer

Write

Configure

Time

1st Scan 2nd Scan

3rd Scan

Module available

to perform block

transfer

1 2 3 456789

Internal Scan time = 50msec

T = 100ms, 200ms, 300ms ... 3.1sec.

In this chapter, you learned how to program your programmable controller. You

were given sample programs for your PLC–2, PLC–3 and PLC–5 family

processors.

You also read about module scan time.

Module Scan Time

Chapter Summary

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 67 68

Comentarios a estos manuales

Sin comentarios

Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario Pagina 24

Comentarios a estos manuales

Relacionado con productos y manuales para Equipo Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE

Prodotti e manuali riguardandi Illuminazione Feiss F1919-6+1