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4-16 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
4
Example:
In the following example, a delay timer (with address) TMRID is used to control the length of time
that coil DWELL is on. When the normally open (momentary) contact DO_DWL is on, coil
DWELL is energized. The contact of coil DWELL keeps coil DWELL energized (when contact
DO_DWL is released), and also starts the timer TMRID. When TMRID reaches its preset value of
one-half second, coil REL energizes, interrupting the latched-on condition of coil DWELL. The
contact DWELL interrupts power flow to TMRID, resetting its current value and de-energizing coil
REL. The circuit is then ready for another momentary activation of contact DO_DWL.
|
| DO_DWL REL DWELL
|——| |——+——|/|—————————————————————————————————————————————————————————————( )—
| |
| DWELL |
|——| |——+
| _____
| DWELL | | REL
|——| |———| TMR |———————————————————————————————————————————————————————————( )—
| | 0.1s|
| | |
| CONST —|PV |
| +00005 |_____|
|
| TRMID