Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 31)

100

101

Chapter

Installing the BASIC Module

1 -7

Set Backplane Configuration (JW5)

Use JW5 to set the BASIC module backplane configuration. The BASIC

module can perform both block and discrete transfers. With JW5 set to

8-point mode, the BASIC module uses 8 bits in both the input and output

image table for block transfer. When you have JW5 (page 1 -7)

configured for 16-point mode, the firmware also allows you to

examine/use bits 10–17 for status of the communication ports.

Important: When the BASIC module is in 16-point mode you must

perform all block-transfers synchronously with a PLC-5 processor.

Asynchronous block transfers do not work with this configuration and

cause the backplane circuit within the module to lock up. The BASIC

module ships with JW5 configured for 8-point mode (Series A

compatible). Unless you are using calls 32, 33, 34, 49, 50, 118, 122, or

123 (see Chapters 12 and 13) you should be in 8-point mode.

Important: You cannot use 2-slot chassis addressing if this jumper is set

for 16-point mode. See page 1 -10 for information regarding the backplane

configuration and addressing.

Input image bits Output image bits Read block words Write block words

✔

your selection:

8 64 max 64 max

factory setting

(Series A setting)

16 16 64 max 64 max

①

2-slot chassis addressing not allowed. Block transfers must be synchronous.

Refer to Chapter 5 for more information regarding the backplane mode.

Chapter

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