Function of each device
z The counters can be divided into the following sorts according the their usage and
purpose：
[Used for interior count] Common use / power failure retentive use
16 bits counter：Used for plus count，count bound: 1~32,767
32 bits counter：Used for add / minus count，count bound: -2,147,483,648~+2，
147,483,647
These counters are used for PLC’s interior signals, usually their response speed is below
10Hz.
[Used for high-speed count] For power failure retentive use
32 bits counter: For plus / minus count, count bound: -2,147,483,648~+2,147,483,6487
(Single phase plus count，single phase plus/minus count，AB phase
count) allocate to the special input points.
High-speed counter can count with the frequency below 200kHz，independent with the
PLC’s scan cycle.
【Counter（C）】
z Data register is the soft unit used by data register to save data. XC series PLC’s data
registers are all 16 bits (The high bit is the sign bit), Combine two registers can carry on
32 bits data disposal (The high bit is the sign bit).
Just the same with other soft units, data registers can also be divided to be two types: for
common use and power failure retentive use.
【Data register（D）】
z In the diverse value used by PLC, K means decimal integer，H means Hex. Value. They
are used to be the set value and current value for the timer and counter, or applied
instructions’ operands.
【Constant（K）、(H)】
【Pointer（P）（I）】
z Pointers are used for branch and interrupt. The pointer (P) used by branch is the jump
aim used for condition jump or subroutine jump. Pointer used for interrupt is used for the
assigned input interrupt, time interrupt.
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