model 2704 controller installation and operation handbook - Soliton

Getting Started 2704 Controller
3.12. PARAMETER AVAILABILITY AND ALTERABILITY
A parameter which appears on a page is described as available. Parameters are not available
if they are not appropriate for a particular configuration or instrument status. For example,
relative cool gain does not appear in a heat only controller, and integral time does not appear
in an On/Off controller.
A parameter described as alterable is preceded by the ! symbol which indicates that its value
can be changed. A parameter which is not alterable may be viewed (subject to availability),
but may be changed by an instrument algorithm.
A parameter is alterable only if the following conditions are satisfied:-
• The parameter is READ/WRITE
• The parameter does not conflict with the status of the instrument. For example, the
proportional band will not be alterable if autotune is active
• The instrument keys must be enabled. Keys can be disabled by a logic input, turned off
in configuration level or via digital communications. A logic input can be configured to
disable front panel keys; this will not remove remote control of the user interface via
digital communications.
The Navigation Diagram which follows shows all pages which are available at Level 3. For a
particular configuration not all pages are displayed on the controller. For example:-
the programmer pages do not appear if a programmer is not configured; the Loop 2 and 3 set
up pages do not appear for a single loop controller.
Any one or all of the pages shown in the navigation diagram can also be displayed at Level 1
& 2. This, however, will have been pre-set in Configuration Level (see 2704 Engineering
Manual Part No HA026933).
3-18 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00