1. On-delay timer: On-delay timer is the most common and most basic timer in various PLCs. This kind of timer is called SI type timer in SIEMENS PLC.
2. Off-delay timer: This kind of timer has no delay when the input condition 00000 is on, and only delays when the input condition 00000 is OFF. In SIEMENS PLC, it is called SF timer.
3. Hold-on On-delay Timer: This type of timer is used to generate a latch function when the input condition 00000 is ON. Even if the input condition 00000 is turned OFF, the input condition is still ON. When the timer is When the current value is equal to the set value, the timer operates. This kind of timer is called the SS type timer in the SIEMENS PLC.
4. Pulse-type timer: This type of timer is immediately after the input condition 00000 is turned on, but the timer turns off even if the input condition 00000 is ON after the time set by the timer. status. That is, the maintenance time of this timer ON state is determined by the setting value. If the duration of 00000 is ON is less than the timer's set value, the ON state hold time of the timer is the duration when the input condition 00000 is ON. This kind of timer is in the PLC of SIEMENS, it is called SP type timer.
5, expansion type pulse timer: The difference between this type of timer and pulse type timer is that as long as the input condition 00000 appears ON state, no matter how long it lasts, can make the timer to maintain the ON time and timing The settings of the device are the same. This kind of timer is called SI type timer in SIEMENS PLC.
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