Rockwell-automation 1794-ID2 U.MNL INCREMENTAL ENCODER Bedienungsanleitung PDF herunterladen (Seite 64)

6–2 Input, Output and Configuration Files for Analog Modules when used with ControlNet

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Scheduled DataĆTransfer

Scheduled data transfer:

• is continuous

• is asynchronous to the ladder-logic program scan

• occurs at the actual rate displayed in the Actual Packet Interval

field on the programming software ControlNet I/O mapping

(monitor) screen

Unscheduled DataĆTransfer

Unscheduled operations include:

• unscheduled non-discrete I/O data transfers—through ControlNet

I/O Transfer (CIO) instructions

• peer-to-peer messaging—through Message (MSG) instructions

• messaging from programming devices

Unscheduled messaging on a ControlNet network is

non-deterministic. Your application and your configuration—number

of nodes, application program, NUT, amount of scheduled bandwidth

used, etc.—determine how much time there is for

unscheduled messaging.

Module I/O Mapping

The I/O map for a module is divided into read words and write

words. Read words consist of input and status words, and write

words consist of output and configuration words. The number of

read words or write words can be 0 or more. The length of each I/O

module’s read words and write words vary in size depending on

module complexity. Each I/O module will support at least 1 input

word or 1 output word. Status and configuration are optional,

depending on the module.

For example, a 16 point discrete input module will have up to 2 read

words and 1 write word.

Module Image

Inputs

Delay

Time

Input Size

Configuration Size

   



ControlNet Image

Not used

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Delay

Time

Not used

Check the I/O map for each module for the exact mapping.

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