A, input relay x
X, y, there are countless normally open and normally closed contacts for programming use.
Y section only for driven load using a normally open contact.
You can see that each group is 8
Input/output points determined in accordance with practical needs.
Host + extended mode can be used to use number followed by addendum to the extension.
Second, the relay output y
Third, the auxiliary relay m
(1) General auxiliary relays
M0–M499 (total of 500), after the restart after power off, GM relays cannot be protected before powering down the State.
(2) the power to maintain auxiliary relays
M500–M1023 (total 524), PLC running again after a power failure, can working state before remain off, using lithium-ion batteries PLC power maintained backup power.
(3) special auxiliary relays
M8000–M8255 (156 points), special-purpose, will be covered in other chapters.
Auxiliary relays have many a normally open, normally closed contacts for use in programming, can only be used as an intermediate relay, cannot be used as an external load.
Four, state relay s
(1) General purpose relays S0–S499
(2) the power to keep state relays S499-S899
(3) for the signal alarm: S900-S999
State relay s is the important component of simple programming step control, there is no further introduction.
Wu, and timer t
T0–T199 (200): clock pulses for 100ms timer, when set value when K=1, delay of 100ms.
Setting range for 0.1–3276.7 seconds.
T200–T245 (46): the clock is 10ms timer, when set value when K=1, delay of 10mS.
Setting range for 0.01–327.67 seconds.
(2) integrating the timer
T246–T249 (4): clock pulses for integrating 1ms timer.
Setting range: 0.001–32.767 seconds.
T250–T255 (6): clock pulses for the accumulation of 100ms timer.
Setting range: 0.1–3267.7 seconds.
Integrating the meaning of timers: when controls volume timer circuit is switched on, the timer start time, when the set time timer actions, if not before the action timer control circuit is disconnected or power failure, totalizing timer can keep has computing time, and control circuit is switched on again, integrating the timer from the totalizer value is counted.
Integrating timers can use RST command to reset.
Five, counters, c
(1) 16bit counter
C0–C99 (100 points): universal
C100-C199 (100 points): maintain
Set value range: K1–K32767
(2) 32bit CNTR
C200–C219 (20 points): universal
C220–C234 (15 points): maintain.
Setting range:-2147483648 to +2147483647
Reversible counting direction of the counter (with count or count reduction) set up by special auxiliary relays M8200–M8234.
M8 through reducing the count, M8 off plus count.
(3) high speed counter: C235–C255 (introduced in the later examples)
VI data register d
D0–D199 (200): General-purpose data registers, namely, power down all of the data is cleared.
D200–D511 (312): power-off protection data registers.
Seven, B line