OPERATION
27
5. Press the “ENTER” key to store the new data.
The display blanks temporarily as the control
stores the information. If the entry is out of
range for the selected function, the control
may change the entry to a value in range.
6. The next function to be interrogated or modi-
fied may be specified. If no additional functions
need to be selected, the control can be
returned to displaying the current count value
by pressing the “COUNT” key.
CHANGING THE PRESET VALUES
To change the value of Preset 1, Preset 2 or Pre-
set 3, follow these steps:
1. Press the “PRESET 1,” “PRESET 2,” or “PRE-
SET 3” key. The display will show the current
value for that preset. If the value displayed is
the same as the desired value, proceed to step
4.
2. Key in the new preset value. Upon pressing
the first key, the current preset value disap-
pears and the digit which was pressed
appears. Each successive digit displays as it is
pressed.
3. Press the “ENTER” key. The display blanks for
a moment and then redisplays the new preset.
This confirms that the new value has been
entered.
4. Press the “COUNT” key. The display returns to
showing the current count value.
5. If other presets must be entered, return to step
1.
PREVENTING PRESET MODIFICATION
To avoid accidental change to the preset values, it
is recommended that the ability to change the Pre-
sets is inhibited whenever possible.
Function code 41, Preset Lock, allows any combi-
nation of Presets to be inhibited (see Figure 21).
Any Presets selected in Function code 41 cannot
be changed when the Program Inhibit Input is
energized (see “Inhibiting Programming Modifica-
tions” below).
DISABLING THE FRONT PANEL RESET KEY
Select the Momentary Reset mode (enter “1” in
function 82) and install a jumper from the reset
input (terminal #17) to DC Common. This disables
the Front Panel Reset key and prevents the opera-
tor from accidentally resetting the counter.
The jumper may be replaced by a normally closed
contact. In this case the counter is reset externally
by opening and closing this contact.
If power is interrupted, the counter is not reset
when power is reapplied.
INHIBITING PROGRAMMING MODIFICATIONS
The function codes and their values may be
accessed and modified whenever the control has
power applied, including times when the process
being controlled is running.
,
,
,
,
WARNING
CHANGING FUNCTION CODE VALUES
WHILE THE PROCESS IS OPERATING
MAY BE HAZARDOUS TO THE OPERA-
TOR AND/OR THE MACHINERY. USE
EXTREME CAUTION. WHENEVER POS-
SIBLE, STOP THE PROCESS BEFORE
ATTEMPTING TO MODIFY FUNCTION
CODE VALUES.
To avoid accidental change to the function code
values, it is recommended that the ability to
change them be removed by installing a jumper
between the PROGRAM INHIBIT terminal and DC
Common on the rear of the control. When
installed, all of the functions may be interrogated
but not modified.
