Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 91)

Publication 1760-UM001D-EN-P - September 2005
Draw a Circuit Diagram with Pico 4-31
Timing Relays, Single Pulse
The relay switches a contact for a time equal to the delay time set,
regardless of the length of the trigger signal.
Signal Diagram:
The reset coil has priority over the trigger coil and resets the relay
contact before the time has elapsed. If the time is set to zero, the
contact is set for the duration of one program scan.
The cycle time varies according to the length of the circuit diagram.
Typical applications include:
• Adjusting switching signals to a defined pulse length
• Shortening pulses to the duration of a cycle (one-shot)
Timing Relays, Flashing
The relay closes and opens the relay contact alternately with the
flashing frequency.
EXAMPLE
t t
Output
Reset
Trigger
On
On
On
= flash
Flash Frequency
1
2 Set Time
×
-------------------------------- =
Set Time: 0.2s, Flash Frequency
1
0.4s
---------- 2.5 Hz = =