Fuji Electric LONWORKS OPC-LNW, Инструкция по эксплуатации

Страница: 54 / 84

12
Chapter 7 Object Details
7.1 Overview
The interface card supports two objects--a node object and Variable Speed Motor Drive object (VSD object).
This chapter provides detailed information on these objects.
7.2 Node Object
7.2.1 Node object overview
The node object processes the system events in LONWORKS network communication for the interface
card. (Usually any intervention of users or integrators is not required.)
Figure 7-1 illustrates the relationship between a node object and network variables (NVs).
Node Object #0
nv2
nvoStatus
SNVT_obj_status
nv1
nviRequest
SNVT_obj_request
nv8
nvoFileDirectory
SNVT_adress
Figure 7-1 Overview Structure of Node Object
7.2.2 List of node object network variables (NVs)
Table 7-1 lists node object network variables supported on the interface card.
Table 7-1 Node Object Network Variables
Index Variable name Variable type Description
nv1 nviRequest SNVT_obj_request This variable is used to request a particular mode for an
object.
Requests supported:
- RQ_NORMAL(0)
- RQ_ENABLED(7)
- RQ_DISABLED(1)
- RQ_UPDATE_STATUS(2)
- RQ_REPORT_MASK(5)
- RQ_CLEAR_ALARM(10)
nv2 nvoStatus SNVT_obj_status This variable is used to report the status of an object.
Statuses supported:
- object_id
- invalid_id
- invalid_request
- disabled
- in_alarm
- report_mask
nv8 nvoFileDirectory SNVT_address This variable is used to provide the starting address of
the directory that contains the configuration file.