ABB Johnson Controls AYK550-UH, Руководство пользователя

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A
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550-UH User’s Manual 1-207
Embedded fieldbus
N2 protocol technical data
Overview
The N2 Fieldbus connection to the A
YK
550 drives is based on an industry standard
RS-485 physical interface. The N2 Fieldbus protocol is a master-slave type, serial
communication protocol, used by the Johnson Controls Metasys® system. In the
Metasys architecture the N2 Fieldbus connects object interfaces and remote
controllers to Network Control Units (NCUs).
The N2 Fieldbus can also be used to connect A
YK
550 drives to the Metasys
Companion product line.
This section describes the use of the N2 Fieldbus with the A
YK
550 drives’
connection and does not describe the protocol in detail.
Supported features
In the N2 Fieldbus protocol the A
YK
550 drive appears as a “virtual object”.
A virtual object is made up of:
• Analog Inputs
• Binary Inputs
• Analog Outputs
• Binary Outputs
• Internal values for Floating point, Integer, and Byte values.
The A
<.
550 drive does not support N2 Fieldbus communication “internal values”.
All of the Analog and Binary I/O objects are listed below, starting with N2 analog
input objects below.
Analog Input – The analog input objects support the following features:
• Analog Input actual value in engineering units
• Low Alarm limit
• Low Warning limit
• High Warning limit
• High Alarm limit
• Differential value for the hysteresis of the Alarms and Warnings
A
<.
550
Analog Inputs
Binary Inputs
Internal values, Float, Integer, Byte
Analog Outputs
Binary Outputs
Virtual Object
Metasys
Note: Metasys inputs are drive outputs and
drive inputs are Metasys outputs