Emerson Autochangeover Controllers AC8 Manual de usuario descargar pdf (Pagina 15)

Revision B.33 2/25/2011

Liebert Monitoring Group – Development

Page 15 of 149

Liebert Environmental Units

Using Unit Control Points

This section is an example of how to utilize Liebert environmental unit Setpoints Set registers. In all cases the

Setpoints View section contains the value that the unit itself is reporting and can be used to confirm that the unit

received the transmitted command.

Example table from this document:

SiteScan Availability

Modbus

BACnet

Instance

(Exec. 6

Modules)

BACnet

Instance

(Exec. B

Modules)

Notes:

Control Points (Set)

Unit On/Off

40349

349

BC01_x

Bit 0 on=unit off Bit 1 on=unit on

Temperature Setpoint

40350

350

BC02_x

Temperature Tolerance

40350

350

BC02_x

Multiply desired value by 1000

Humidity Setpoint

40351

351

BC03_x

Humidity Tolerance

40351

351

BC03_x

Multiply desired value by 1000

Reheat Lockout

40349

349

BC01_x

Bit 2 on=RH off Bit 3 on=RH on

Humidifier Lockout

40349

349

BC01_x

Bit 2 on=HL off Bit 3 on=HL on

The above notes in the document refer to binary bits. Notice that register 40349 is used more than once in the table.

The table below shows the integer number in the value set from BMS column.

Function

Command if

BIT=1

BIT

Number

Value sent from

BMS

Resulting Action

Unit On/Off

―Off‖

BIT 0

Units turns ―Off‖

Unit On/Off

―On‖

BIT 1

Unit turns ―On‖

Reheat Lockout

―Off‖

BIT 2

Reheat Lockout turns ―Off‖

Reheat Lockout

―On‖

BIT 3

Reheat Lockout turns ―On‖

Humidifier Lockout

―Off‖

BIT 4

Humidifier Lockout turns ―Off‖

Humidifier Lockout

―On‖

BIT 5

Humidifier Lockout turns ―On‖

For the setpoint registers, the setpoint and tolerance are in the same register. Writing a zero to the field will result in

no change.

Control Points (Set)

Temperature Setpoint

40350

350

BC02_x

Temperature Tolerance

40350

350

BC02_x

Multiply desired value by 100

Humidity Setpoint

40351

351

BC03_x

Humidity Tolerance

40351

351

BC03_x

Multiply desired value by 100

Some examples of valid values to send:

To make the Temperature Setpoint “70”, send a “70” to the register.

To make the Temperature Tolerance “+/- 2.5 degrees”, send “2500” to the register.

To make the Temperature Tolerance “+/- 2.5 degrees” and Setpoint “70”, send “2570” to the register.

To make the Humidity Setpoint “50%”, send a “50” to the register.

To make the Humidity Tolerance “+/- 5%”, send “5000” to the register.

To make the Humidity Tolerance “+/- 5%” and Setpoint “50%”, send “5050” to the register.

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