User manual

Publication 1760-UM001A-EN-P
Drawing a Circuit Diagram with Pico 4-21
Minimum time setting with 1760-L12xxx: 40 ms and 1760-L18AWA: 80 ms. A
time value less than the maximum scan time of the Pico controllers may cause
uncontrolled switching states.
Timing Relays, On-Delay, Without and With Random Switching
The relay switches a contact after the setpoint delay has elapsed.
With random switching, the relay contact switches randomly at
any time up to the specified time value (shown shaded in figure).
Figure 4.4 Timing Diagram
The trigger input starts the time (t). If the trigger input is disabled after the time
has elapsed, timer is reset and the output is turned off (A). If the trigger coil drops
out before the time has elapsed, the contact is not turned on (B). The reset coil has
priority over the trigger coil and always resets the timer and turns the output off
(C). If the preset is set to zero, the output follows immediately after the trigger
signal.
Typ ic al ap pli ca tio n s
• Switching conveyor belts on or off after a delay
• Detecting gaps in the switching of sensors in the event of a fault
• Automatic window shutter control with random switching times
Time units and setpoint time parameters Resolution
S 00.00 Seconds 10 x milliseconds, 00.00 to 99.99 10 ms
M:S 00:00 Minutes: seconds, 00:00 to 99:59 1 s
H:M 00:00 Hours: minutes, 00:00 to 99:59 1 min.
Parameter set displayed via the PARAMETER menu option
+ Access enabled - Access disabled
X?X
ttt
ABC
Output
Reset
Trigger
On
On
On