LMS 100NP Programmable Instruction Manual Download Page 10

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Section 3 PROGRAMMER

INDEX

Function overview

B.1

Getting started

B.2

Program run mode

B.3

Display functions

B.4

Example program

B.5

Function map

B.6

Function list

B.7

Memory allocation table B.8

Memory full indicator

B.9

Programming example

B.10

Program edit example

B.11

3.0 FUNCTION OVERVIEW

The Programmer function in Level P enables the instrument to control applications
needing

Setpoint

changes over time. Examples of this are

Ramp

changes where a gradual

Rate

of change can be set, or

Step

changes which are instantaneous. These can be

separated by

Soak

periods during which the process is held at a constant value. Each

individual time interval of the program or

Segment

, together with it’s associated moving

setpoint value can be stored as a unique

Program

and for example be represented by the

diagram below.

Setpoint

Soak

Step

Ramp

Time (Segments)

In addition to those settings that determine the segment profile, it is also necessary to set

program start

values, together with the preferred

ramp rate time units

for each individual

program.

At the end of a sequence, a Program can be arranged to repeat (

Loop

), either a specified

number of

Cycles

, or continuously. Only one

Loop

can be included in a

Program

. When the

program is running, the

Display

indicates progress through the sequence of segments, and

can additionally be interrogated for further segment information.

It is also possible to CALL an already existing program as a sub program that can be
inserted as a segment of another program.

To speed up

Program

configuration, several

Edit

functions have been provided so that

individual

Segments

and

Programs

may be

Deleted

Inserted

, and an entire

Program

may be

Copied

and then

Pasted

into another that it will replace.

For safety reasons, three modes of recovery from a power failure are available. These either
automatically

Re-start

the Program from the beginning,

Continue

it from where it stopped, or

Hold

it waiting for a user re-start.

Either one or both of the two auxiliary outputs can be configured as

Event

outputs.

Engaging the

Holdback

feature will temporarily halt Setpoint ramping to allow the process

temperature to catch up should it deviate by more than a pre-set amount during a

Ramp

segment.

To afford maximum programming flexibility, memory is allocated dynamically, and not pre-
allocated. This allows the user the freedom to configure a small number of long programs
or a larger number of shorter ones, up to the permitted maximum of 126 Segments per
program, and a limit of 31 Programs. Should these limits be exceeded, or the Programmer
memory become fully used, the display will read

ProG FULL

. Programs can be planned

using the

Memory Allocation Table

which details the memory requirements of individual

segment types. During configuration a check can be kept on memory usage by
interrogating the

USEd

feature of the display to give an instant reading of ‘percentage

memory used’.

Finally, once a program has been configured, it can be run from the

run off/on/hold

controls in Level P, and in addition a quick access