Flowserve 3400IQ Digital Positioner - Manual (Page 90)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
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Virtual Field Device (VFD) List Objects
Two objects identify the VFDs in the device:
OD Index VFD_REF VFD_TAG
273 1 ‘MIB’
274 2 ‘Resource’
Function Block Scheduling The SMIB contains a schedule, called the function block schedule, that
indicates when that device’s function blocks are to be executed.
System Management schedules the start of each function block relative to the macro cycle of the
device. The macro cycle represents one complete cycle of the function block schedule in a device.
The macro cycles of all devices on the link are synchronized so that function block executions and
their corresponding data transfers are synchronized in time.
Using the configurator software, the device’s function block schedule can be pre-configured.
Function Block Scheduling Objects
Four scheduling objects are defined in the Logix 3400IQ digital positioner. Table 8.27 lists the func-
tion block scheduling objects with their object directory index and default values.
Table 8.27 Function Block Scheduling Objects
Object Description OD Index Default Value
VERSION_OF_SCHEDULE The version number of the
function block schedule.
275 0
FB Schedule Entry #1 Default setting is the AO
block
276 START_TIME_OFFSET
- 0 FB_OBJECT_INDEX - 257
VFD_REF - 1
FB Schedule Entry #2 Default setting in the PID
block
277 START_TIME_OFFSET - 16000
FB_OBJECT_INDEX - 310
VFD_REF - 1
FB Schedule Entry #3 278 0xFFFFFFFF
FB Schedule Entry #4 Available 279 0
8.19 Network Management
Description
Network management provides for the management of a device’s communication system by an
external network manager application.
Network management operates on special objects in the Network Management Information Base
(NMIB) which is part of the Management Virtual Field Device (VFD).
Network Management Features
Network Management provides the following features:
Loading a Virtual Communication Relationship (VCR), which may be a list or a single entry. See VCR
list objects.
Loading/changing the communication stack configuration
Loading the Link Active Schedule (LAS)
Performance monitoring
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