Timer Input Parameters; Timer Range; Timer Input Filtering; Timer Input Operation - Omega Engineering PTC900 User Manual

6.1 MODULE 1 - T
Module 1 is the programming module for the Timer Input Parameters. In the
Display Mode, the TMR annunciator indicates the Timer display is currently
being shown. An EXCHANGE PARAMETER LISTS feature, which includes
the Timer Start and Timer Stop Values, is explained in Module 2.

TIMER RANGE

23 TIMER RANGE SELECTIONS
(
= SEC;
RANGE MAXIMUM DISPLAY
SELECTION DISPLAY RESOLUTION
SECONDS
1 SEC
0.1 SEC
0.01 SEC
0.001 SEC
MINUTES
1 MIN
0.1 MIN
0.01 MIN
0.001 MIN
HOURS
1 HR
0.1 HR
0.01 HR
0.001 HR

TIMER INPUT OPERATION

This parameter determines how the Timer Input Signals affect the
"Run/Stop" status of the Timer. The timing diagrams below reflect a Sinking
input setup (active low). A Sourcing input setup (active high) is available
through plug jumper selection (see Section 2.0). In this case, the logic levels of
the timing diagrams would be inverted.
The Timer can also be stopped using a Timer Stop Value or a Setpoint. This
type of Stop condition is cleared when a Timer Reset occurs, or another start
edge is applied.
For and operation, Input B provides a level active Timer
Inhibit function. This function is also available through a User Input (see
Module 2). Timing diagrams are shown below for "
modes. The " " through "
timer display value is also reset at "Time Start" edges. In the "
" " modes, the timer display value remains held and only updates when
a Timer Start (Input A) or Timer Stop (Input B) edge occurs.
*
,
Level Active (Gated) Operation
Time Time Time Time
Start Stop Start Stop
INPUT A
INPUT B - Timer Inhibit (Level Active)
* - Timer is reset at Time Start edge.
I
IMER NPUT
PARAMETER MENU
)
= MIN; = HR; = DAY
RANGE MAXIMUM DISPLAY
SELECTION DISPLAY RESOLUTION
MINUTES/SECONDS
1 SEC
0.1 SEC
0.01 SEC
0.001 SEC
HOURS/MINUTES
1 MIN
0.1 MIN
0.01 MIN
0.001 MIN
HOURS/MINUTES/SECONDS
1 SEC
0.1 SEC
DAYS/HOURS/MINUTES
1 MIN
" through "
" modes are identical except the
" and
*
,
Edge Triggered Operation -1 Input
Time Time
Time Time
Stop Stop
Start Start
INPUT A
INPUT B - Timer Inhibit (Level Active)
P
ARAMETERS
,
Edge Triggered Operation - 2 Input
Time Time
Start Start
INPUT A
Time Time
Stop Stop
INPUT B
* - Timer is reset at Time Start edge.

TIMER INPUT FILTERING

Provides a 50 msec debounce for the Timer Inputs (A and B). Select
using relays or switch contacts as a signal source.
Timing direction can be reversed through a User Input. (See Module 2.)
TIMER START VALUE
The Timer returns to this value whenever a Timer Reset occurs. The value is
entered in the same display format as the Timer Range selected. Non-zero
values are normally used for "timing down" applications, but they can also
provide an "offset" value when timing up.
"
The Timer stops when this value is reached, regardless of the signal levels on
the Timer Inputs. Selecting
Value can be set or changed. The Stop Value is entered in the same display
format as the Timer Range selected. This Stop condition is cleared when a
Timer Reset occurs. Select
12
( )
*
,
Edge Triggered Operation - 2 Input,
with Display Hold
Time Start,
Display Update
INPUT A
Time Stop,
Display Update
INPUT B
TIMING DIRECTION
to
TIMER STOP VALUE
will display the sub-menu where the Stop
if a Stop Value is not being used.
to
*
Time Start, Display
Update
Display Update
when