GE Industrial Solutions OKCV3000CN DeviceNet - Manual (Page 10)

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support of Explicit Messages. The DGFC supports Parameter object.
This allows the card and the drive to be fully configured. A PC configurator could be connected either when
it is connected to a PLC or there is the LocalBus.
The table below sums up the main features of each mode:
Explicit Messages LocalBus Predefined Mode Predefined Mode as
SBI
DeviceNet is used to... read and write drive
and DGFC parameters
to exchange IVAR and
FVAR among DGFC to read and write fixed
parts of FWA to read and write
synchronous and
asynchronous drive
parameters
DGFC is master or
slave?
slave only slave and master
simultaneously slave only slave only
Type of master (1 PC DGFC PLC PLC
Can DGFC execute a
Bricks program? Indifferent Both master and slave
must execute program must execute a
program
no
Compatibility with
other modes all modes all except Predefined
Mode as SBI all except Predefined
Mode as SBI only Explicit Messages
Number of master
supported
simultaneously by
DGFC
up to 3, according to
DeviceNet resources up to 3, according to
DeviceNet resources only one only one
Dedicated Bricks none CFIX, RFIX and WFIX RFIX and WFIX none
Length and number of
frames
not applicable up to 4 words/packet
during I/O, many packets up to 10 words in
reading and 10 in
writing, one frame up to 10 words in
reading and lOin
writing, one frame
TNetlO
(*) this section describes only the common master. Any DeviceNet node can support any mode, so for example, there
can be a PC card that supports the predefined mode
1.6. WHAT YOU CAN DO
If you want to use the DGFC only as DeviceNet interface (you don’t want to use Win+Drive and/or Bricks
programming) you can read only the next 3 chapters. In all the other cases you can skip only chapter 3.
1.1. HARDWARE CONFIGURATION
If you want to use the DGFC for a DeviceNet network, the DGFC needs an optional card called DNET. Remem-
ber that the DGF card is a technology card with its own commuhication protocol.
Eli
INTRODUCTION
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