Watlow Series SD6 Limit With Devicenet - Manual (Page 2)

Wa t l o w S e r i e s S D 6 L i m i t w i t h D e v i c e N e t ■ 2 ■
Group 2 Only Server
A slave (server) device that is UCMM incapable and must
use the Predefined Master/Slave Connection Set to estab-
lish communications (at a minimum, the Predefined
Master/Slave Explicit Messaging Connection must be sup-
ported). A Group 2 Only device can transmit and receive
only those identifiers defined by the Predefined
Master/Slave Connection Set.
Master/Slave Connections
The SD6 supports the Predefined Master/Slave Connection
Set. The general model calls for the utilization of an
Explicit Messaging Connection to manually create and con-
figure Connection Objects within each connection end-
point. This chapter uses the general model as a basis for
the definition of a set of connections that facilitate commu-
nications typically seen in a master-slave relationship.
These Connections are referred to collectively as the
Predefined Master/Slave Connection Set.
The master is the device that gathers and distributes I/O
data for the process controller. Slaves are the devices from
which the master gathers I/O data and to which the mas-
ter distributes I/O data. The master “owns” the slaves
whose MAC IDs appear in its scan list. To determine with
what slaves it will communicate, the master examines its
scan list and sends commands accordingly. Except for the
Duplicate MAC ID Check, a slave cannot initiate any com-
munication before being told by the master to do so.
Electronic Data Sheet (EDS)
The EDS allows a configuration tool to automate the device
configuration process. The EDS specification provides an
open standard for device configuration and compatibility
among all DeviceNet products. (Refer to the DeviceNet
Specification). You can obtain a copy of the EDS at
www.watlow.com and search on keywords SD EDS, request
a copy by sending an e-mail to [email protected]
or by calling an Application Engineer at +1 (507) 494-5656
between 7 a.m. and 5 p.m. Central Standard Time (CST).
DeviceNet Objects
The following sections describe the standard DeviceNet
objects and the SD6-specific application objects.
Identity Object
Class Code: 01hex
The Identity object provides identification information for
the device. This includes the device manufacturer, product
name, product type, serial number and DeviceNet Rev.
Table 3. Identity Object Revision History
Revision Description
01 Initial Release