Objects - IDEC MICRO/I HG4G-CJT22 F-B Series User Manual

7 BACnet Communication

7.8 Objects

The MICRO/I holds objects registered with WindO/I-NV4 in internal memory. Part of the properties of the object can
be allocated to the device address, and the value of the device address can be written and read. BACnet devices can
read and write the properties of objects on the MICRO/I using services.
Properties of objects on the MICRO/I and values of device addresses allocated to properties are continually
synchronized.
For how to register objects using WindO/I-NV4, refer to "7.6 BACnet/IP Settings Procedure" on page 3-105. The
maximum number of objects that can be registered is 256.
The following diagram shows two concepts.
(1) The BACnet device reads the analog input value of the Analog Input object.
(2) The BACnet device writes the analog output value of the Analog Output object.
∙ Data Sharing
Read Property
∙ Data Sharing
Read Property
Multiple
(1)
BACnet client
(2)
∙ Data Sharing
Write Property
∙ Data Sharing
Write Property
Multiple
For details on properties held by objects, refer to "BACnet Building Automation Data Communication
Protocol", a book published by the Institute of Electrical Installation Engineers of Japan.
3-124
MICRO/I
BACnet objects
Analog
Input object
Present_Value:
Mutually
10.0
reflected
Analog
Output object
Present_Value:
20.0
XXXX object
YYYY object
MICRO/I starts running
Initial values of properties
(Set with WindO/I-NV4)
WindO/I-NV4 User's Manual
Analog I/O module
Device addresses
(1)
D0000: 1000
Coefficient: 0.01
(2)
D0004: 1000
Coefficient: 0.02
Physical I/Os
External
analog input:
(1) 10 V
CH0: 10 V
External
analog output:
(2)
20 mA
CH2: 20 mA