Micromod MOD: 30ML Operation and Template Setup - Manual (Page 40)

MOD 30ML Multiloop Controller
OPERATION
3-8
3.7 UP / DOWN KEY OPERATION
3.7.1 Ramping
The Up ( ∆) and Down (∇) keys are used to ramp variables such as local set-point and
control output up or down. The ramping function also applies to tuning and setup. Various
ramp rates can be obtained by using the
∆/∇ keys alone and in combination with the ‘A'
and ‘R/L' keys. The available ramping options are as follows:
Increment Least
Significant Digit
Press and release the ∆ or ∇ key.
Ramp Least
Significant Digit Press and Hold an ∆ or ∇ key (ramp rate is about two
changes per second).
Increase Ramp
Rate Press the ‘A' key while [FST] is flashing. Each depression of
the [FST] key moves the ramping digit one place to the left.
Decrease Ramp
Rate Press the ‘R/L' key while [SLO] is flashing. Each depression
of the [SLO] key moves the ramping digit one place to the
right.
Exit Ramping
Function Press the TAG key to exit prior to time out of the flashing
[FST] and [SLO] displays.
3.7.2 Data Entry
There are two modes by which the new value or state becomes active in a loop;
Immediate Entry and Procedural Entry:
Immediate Entry
[
∇ / ∆]
The new value of the variable being changed is immediately
implemented in the loop displayed on the front panel. The
immediate entry mode is indicated by a slash mark between the
arrow icons [
∇ / ∆]. Examples of immediate entry variables are
local set-point and control output when the loop is in manual.
State changes are not allowed in the immediate entry mode.
Procedural Entry
[
∇ ∆]
The new value of the variable or state being changed is not
implemented in the loop until an entry procedure is performed.
After obtaining the required value using the up or down keys, the
new value is entered by pressing the R/L key while an [ENT]
display is flashing next to the key. The procedural entry mode is
indicated by the absence of a slash mark between the arrow icons
[
∇ ∆]. Examples of procedural entry variables are gain and reset;
examples of state changes are direct to reverse control action and
suppressing an enabled alarm.
In the procedural entry mode, the flashing entry prompt [ENT]
times out 10 seconds after use of the arrow keys stops. Thus
there is a timed window during which a new value can be entered.
If the R/L key is not pressed in time, the new data value is aborted
and the variable or state returns to its previous value.