Emerson E2 User Manual download pdf (Page 173)

Lighting Schedules Software Overview • 11-31

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

Figure 11-19 shows 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.

11.10.4.1 The 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

Figure 11-19

- Lighting Schedule Module Cell Diagram

Output

Proof

Light Schedule

Lighting Control Module

Out

Min On/Off

On/Off Delay

Min On/Off

with Delay

DVDV

Desired Value

Proof Fail

Delay

Latch Time

Proof

DVDV

Actual Value

Logic In

Use Alt Sched Comb

LLEV In

Logic In

Occup

Out

Comb Type

Alt Comb

LLev

Interface

Use Alt

Invert Output

Cutin/out SPs

Use Alt LLEV Comb

Out

Events

Active Days

Basic Sched

DVDV

Extern Sched

Use Ext Sched

Light Level LLEV

LLEV Occup

Bypass

Logic In

Sched In

Use Alt

Out

Comb Type

Alt Comb

Schedif

Invert Output

Sunset Today

Offset

Control

Rise/Set Offset

Multi Logic

Combiner

Use Alt Comb

Logic1

Logic2

Logic3

Logic4

Use Alt

Out

Control

Method

Select

Use Alt Control

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