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There are three timer pulses: 1ms, 10ms, and 100ms. For example, 10ms means accumulate
10ms pulses.
Accumulation/not accumulation
The timer has two modes: accumulation timer means even the timer drive coil is OFF, the
timer will still keep the current value; while the not accumulation timer means when the
accumulation value reaches the set value, the output acts, the accumulation value reset to 0.
According to different application purposes, the counters contain different types:
For internal counting (for general using/power off retentive usage)
16 bits counter: for increment count, the count range is 1~32,767
32 bits counter: for increment count, the count range is 1~2,147,483,647
These counters are for PLC internal signal. The response speed is one scan cycle or longer.
For High Speed Counting (Power-off retentive)
32 bits counter: the count range is -2,147,483,648~ +2,147,483,647
(Single phase increment count, AB phase count). For special input terminals.
The high speed counterwill not be affected by PLC scanning period. For increment mode, it
can count max 80KHz pulses; for AB phase mode, it can count max 50KHz pulses.
Address assignment principle
In basic units, assign the timer address in decimal form.
Function of Data Registers
Data Registers are used to store data, the sign is D and HD.
Address assignment principle
The data registers in XD/XL series PLC are16 bits (the highest bit is sign bit), combine two
data registers together is for32 bits (the highest bit is sign bit) data processing.
Using notes
Same to other soft components, data registers also have common type and power-off retentive
type.
Function of FlashROM registers
FlashROM registers are used to store data, the sign is FD.
Address assignment principle
In basic units, FlashROM registers address is in form of decimal;
Using notes
Even the battery powered off, this area can remember the data. So this area can store
important parameters. FlashROM can be writen for about 1,000,000 times, and it takes
timewhen writing. Frequently writing can cause permanent damage for FD.
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