Emerson E2 operation manual Functions of the Lighting Schedule Application, Control Method Select

setpoints, and overrides the schedule as the real-time light- ing conditions warrant. As a result, the light level sensor and schedule both work to provide adequate light when

needed AND saving energy by keeping lights OFF when they are not necessary.

11.10.2 Functions of the Lighting Schedule Application

Use Alt Comb

DV

Lighting Control Module

Multi Logic

Offset

Combiner

DV

Sunset Today

Control

Use Alt

Rise/Set Offset

Out

Logic1

Logic2

Logic3

Logic4

Light Level LLEV

AV

Control

LLev

Method

Logic In

DV

AV

Interface

DV

Select

LLEV In

Out

DV

Logic In

Schedif

DV

DV

DV

Logic In

Out

DV

Use Alt Control

Min On/Off

LLEV Occup

Occup

DV

DV

Sched In

DV

Use Alt

with Delay

DV

Use Alt LLEV Comb

DV

Invert Output

DV

In

Out DV

Output

DV

Use Alt

DV

Invert Output

Comb Type

Min On/Off

Alt Comb

Cutin/out SPs

On/Off Delay

Comb Type

Alt Comb

Basic Sched

Light Schedule

DV

DV

Extern Sched

Out

DV

Proof

Events

DV

Desired Value

Proof Fail

DV

DV

Proof

Active Days

DV

Use Ext Sched

Actual Value

Use Alt Sched Comb

DV

Delay

Bypass

DV

Latch Time

Proof

DV

Figure 11-19- Lighting Schedule Module Cell Diagram

Figure 11-19shows a flowchart diagram of the Light- ing Schedule application and the eight cells that work together to control the lights. A description of each cell and the functions they perform are given below.

11.10.3 Control Method Select

Control Select determines whether the Multi-Logic Combiner is used or the Light Level Interface and Sched- ule Interface are used for Lighting Control. When Use Alt Control is set to Yes, the Light Level Interface and Sched- ule Interface combination strategies are disabled and are not visible. When Use Alt Control is set to No, the Multi- Logic Combiner matrix is disabled and not visible.

11.10.4 Standard Control

Standard control comprises Light Level Interface and Schedule Interface strategies.

11.10.4.1The Light Level Interface Cell

(LLEV INTERFACE)

The Light Level Interface cell of the Lighting Schedule application translates the value of the light level sensor into an ON or OFF command by comparing the analog

light level to a set of Cut In/Cut Out setpoints.

From an OFF state, when the light level falls below the Cut In setpoint, the result of the light level comparison will be an ON state. When the light level rises above the cut-out setpoint, the state will transition from ON to OFF.

The ON/OFF state determined by the light level can be logically combined with LOGIC IN, a digital input from an input point or another application in E2. The result of this comparison will be the final ON/OFF light state com- mand that is sent from the Light Level Interface cell to the Schedule Interface cell (explained below).

Logical Combination Strategies

There are several different strategies for combining the light level ON/OFF state with the value of the LOGIC IN input:

•Logic Only - The cell will read only the LOGIC IN input and ignore the light level sensor reading.

•LLEV Only - The cell will read only the light level sensor and ignore the value of the LOGIC IN input.

•Both ON/Both OFF - From an output=OFF

Lighting Schedules Software Overview • 11-31