Download Model 2704 High performance Controller/programmer User Guide

Programmer Configuration
2704 Controller
4.1. WHAT IS SETPOINT PROGRAMMING ?
In a setpoint programmer you can set up a profile in the controller in which the setpoint varies
in a pre-determined way over a period of time. Temperature is a very common application
where it is required to ‘ramp’ the process value from one level to another over a set period of
time.
The 2704 controller will program up to three separate profiles. These may be temperature,
pressure, light level, humidity, etc., depending on the application, and are referred to as
Profiled Setpoints (PSPs).
The Program is divided into a flexible number of Segments - each being a single time
duration, - and containing details for each profiled setpoint. The total number of segments
available is 100 per program with a maximum of 600 for the Time to Target Programmer
and 480 for the Ramp Rate programmer.
The 2704 programmer may store up to 20 programs as standard, with up to 60 if purchased.
It is often necessary to switch external devices at particular times during the program. Digital
‘event’ outputs can be programmed to operate during those segments.
4.1.1. Synchronous Programmer
In a synchronous programmer all PSPs are run on a common timebase. That is, they all start
at the same time and the time duration of a segment is the same for each PSP. This is shown
in Figure 6.1.
Program
Segment
PV
Segment 1
Time
Profile
Setpoint1
Segment 1
Target
Profile
Setpoint 2
Profile
Setpoint 3
Start (Run) 1h
2h
3h
4h
5h
6h
7h
8h
Time
1
16
Up to 16 Digital Events for the program
Figure 4-1: An Example of a Synchronous Setpoint Program
4-4
User Guide
Part No HA026502
Issue 5.0
Dec-04