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C.3 register object – Rockwell Automation DeviceNet Communications Module User Manual

Page 120

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C-6

DeviceNet Communications Module

C.3 Register Object

Class Code

Instances

The number of instances is fixed at 13 and is as shown below:

If a drive is not present, the Data instance attributes for the
individual drive will contain values of zero and the Bad Flag instance
attribute will be set.

The size of the Data instance attribute for instances 1, 2, and 13 will
change depending upon the number of drives for which the module
is configured.

Hexadecimal

Decimal

0x07

7

Instance

Description

0

Class

1

Command reference for all drives (read/write)

2

Status and feedback for all drives (read-only)

3

Command and reference for Drive 0 (read/write)

4

Status and feedback for Drive 0 (read-only)

5

Command and reference for Drive 1 (read/write)

6

Status and feedback for Drive 1 (read-only)

7

Command and reference for Drive 2 (read/write)

8

Status and feedback for Drive 2 (read-only)

9

Command and reference for Drive 3 (read/write)

10

Status and feedback for Drive 3 (read-only)

11

Command and reference for Drive 4 (read/write)

12

Status and feedback for Drive 4 (read-only)

13

Masked Command write for all drives (read/write)

1

1

The Data Instance attribute for the masked command is the same size as
the data attribute for instance 1. However, the structure is a Command
word followed by a mask word for each drive. The Logic Command for
each drive is set to the value of the first word of the data where there are
ones in the second word of the data.

Logic Command = ((Command word and not mask word) or (Command

word and mask word))