First, the input relay X • X, Y there are numerous normally open, normally closed contact for programming use.
• Y The outer part has only one normally open contact for the drive load.
• You can see that each group is 8
• The number of input and output points is determined according to the actual engineering requirements.
• You can use the extension mode to use, and the extended numbers are compiled in sequence.
X0 – X7
X10-X17
X20-X27
X30-X37 (32 points total)
Second, the output relay Y
Y0 – Y7
Y10 – Y17
Y20 – Y27
Y30 – Y37 of 32
Third, auxiliary relay M
(1) General auxiliary relay
M0 – M499 (total of 500), after the power is turned off, the general relay can not protect the state before power failure.
(2) power down to maintain the auxiliary relay
M500 – M1023 (a total of 524), PLC power and then run, to maintain the working state before the power failure, the use of lithium batteries as a power down to maintain the backup power supply.
(3) special auxiliary relay
M8000 – M8255 (156 points in total), for special purposes, will be described in other chapters.
Auxiliary relays have numerous normally open, normally closed contacts for programming use, can only be used as an intermediate relay, can not be used as an external output load.
Fourth, the state relay S
(1) General status relay S0 – S499
(2) Power-down hold state relay S499-S899
(3) for signal alarm with: S900-S999
The state relay S is an important element for simple programming of the step control, and is not described here further.
Fifth, the timer T
(1) timers
T0 – T199 (200): The clock pulse is 100ms timer, that is, when the set value of K = 1, the delay of 100ms.
The setting range is 0.1 – 3276.7 seconds.
T200 – T245 (46): The timer is a 10ms timer, ie 10mS when the set value is K = 1.
The setting range is 0.01 – 327.67 seconds.
(2) integrated timer
T246 – T249 (4): The clock is a 1ms timer.
Setting range: 0.001 – 32.767 seconds.
T250 – T255 (6 pcs): The clock timer is 100ms.
Setting range: 0.1 – 3267.7 seconds.
The timer is used to calculate the delay time when the loop of the integrated timer is turned on. When the timer expires, the timer operates. If the control circuit is turned off or off before the timer is not active The summing timer can be used to maintain the calculated time. When the control loop is switched on again, the accumulating timer starts from the accumulated value.
The accumulating timer can be reset with the RST command.
Fifth, the counter C
(1) 16bit plus counter
C0 – C99 (100 points): General purpose
C100-C199 (100 points): Power-down type
Setting range: K1 – K32767
(2) 32bit reversible counter
C200 – C219 (20 points): General purpose
C220 – C234 (15 points): Power down hold type.
Setting range: -2147483648 to 2147483647
The count direction of the reversible counter (up or down) is set by the special auxiliary relay M8200 – M8234.
That is, when M8 △ △Δ is turned on, it is decremented when M8 △ △Δ is turned off.
(3) high-speed counter: C235 – C255 (described later in the example)
Data register D
D0 – D199 (200): General data register, that is, all data is cleared when power is cleared.
D200 – D511 (312): Power Down Protection Data Register.
Seven, index register (see site content)

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