Watlow Series SD6 PID Controller with DeviceNet Addendum Manuel d'utilisateur télécharger pdf (Page 3)

Table 5. Descriptions of Elementary Data Types

Data Type Name Data Type Description

BOOL Logical Boolean with values TRUE and FALSE

BYTE Bit string — 8 bits

EPATH DeviceNet path segments

INT Signed 16-bit integer value

SHORT_STRING Character string (1 byte per character, 1 byte length indicator)

UDINT Unsigned 32-bit integer value

UINT Unsigned 16-bit integer value

USINT Unsigned 8-bit integer value

WORD Bit string — 16 bits

This appendix describes the DeviceNet protocol as it is

implemented in the Series SD6 controller. It primarily

describes the objects and attributes accessible via the

DeviceNet protocol. It may be necessary to refer to the

DeviceNet specification as a compliment to the information

found here.

DeviceNet Overview

The SD6 controller supports the object-based modeling

used in the DeviceNet concepts. This product is configured

as a Group 2 Only Slave device using the Predefined

Master/Slave Connection Set.

There are two main categories of objects, DeviceNet

Objects and Application Objects. DeviceNet objects handle

what is necessary for networking and communications.

Application Objects have access to the SD6 controller's

parameters and data.

Addressing

All data is referenced based upon a four-part definition:

Node (MAC ID) + Class + Instance + Attribute.

Table 4. Four Components to an Address, with

Ranges

Node Address (MAC ID) [0 to 63]

Class ID [1 to 255]

Instance ID [0 to 255]

Attribute ID [1 to 255]

Data Types

The descriptions of attributes in the following sections

includes the data type for each. Table 5 lists and describes

these data types.

DeviceNet Communications

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Watlow Series SD6 PID Controller with DeviceNet Addendum Manuel d'utilisateur Page 3