Emerson Autochangeover Controllers AC8 Manual de usuario descargar pdf (Pagina 7)

Revision B.33 2/25/2011

Liebert Monitoring Group – Development

Page 7 of 149

Open Communications

Default Mapping for Modbus & BACnet Objects

This model represents the standard configuration for a Liebert Sitelink-12 module. Consecutive register /

object mapping is utilized, regardless of the SiteLink-12 population. All ports that do not have a Liebert

IGM attached will be assigned “null values” (or zero’s) for their corresponding registers. The default

“slave ID” or “Device ID” follows the CMNet address of the unit. The address can be visually checked by

looking at the address dip-switch or rotary switch settings. However, the address can be changed in

software to suit specific needs.

Please note that the SiteLink hardware places a limit on the quantity of Modbus registers available.

Therefore, it is possible there will be more data points available using BACnet than using Modbus.

How to use this table:

The unit or model specific reference sheets assume that the desired unit is attached to port 1 of the

SiteLink module. If the desired unit is attached to a different port, the table below indicates the starting

For example: The register for “temperature” for a L00 type unit attached to port 1 is identified as

40001. If an additional L00 type unit were attached to port 2, the “temperature” value would be located in

Modbus Notes:

Modbus Registers start at 40001.

All registers are unsigned integers.

BACnet Notes:

BACnet Objects start at 1.

All “Status” and “Alarm” objects are “AI’s” (analog inputs).

The “Control” objects are “AO’s” (analog outputs)

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Emerson Autochangeover Controllers AC8 Manual de usuario Pagina 7