Function of each device
3-1. Every Soft Unit of Programmable Controller
In the programmable controller, there are many relays、timers and counters，they all have
countless “a” contacts（Normally open contacts）and “b” contacts（Normally closed contacts），
Connect these contacts and coils to constitute sequencial control circuit. The following, we’ll
briefly introduce each soft unit:
z In each basic unit，assign the ID of input relay, output relay in the format of
X000~X007，X010~X017…,Y000~Y007，Y010~Y017… this octal format. The ID of
extension is connected behind basic unit.
z The ID of expansion obeys the principle of channel 1 starts from X100/Y100, channel 2
starts from X200/Y200… 7 expansions could be connected totally.
z Use digital filter in the special input filter of input relay, so you can use the program to
change the sieve value. So in the high-speed receive application, you can assign this type
of relay’s ID No.
z Auxiliary relay is the relay inside the programmable controller，this type of output relay
is different from input/output relay，it can’t gain exterior input，it also can’t drive exterior
load，it can only be used in the program。
z The relay used for retentive can still save its ON/OFF status in the case of PLC power
cut.
z Relay used as step ladder chart.
z When not used as working procedure No.，it’s the same with auxiliary relay and can be
used as common contact/coil to carry on programming. Besides, it can also be signal
alarm to diagnose exterior trouble.
z Timer could carry on plus operation to 1ms，10ms，100ms etc. time pulse in PLC, When
reach certain set value, output contact act.
z T100~T199 are timers with the unit of 100ms clock pulse，their current values are the
accumulate values. So, even though timer coil’s drive input is cut, they will still hold the
current value, go on accumulating the action.
【Auxiliary relay（M）】
【Timer（T）】
【Status（S）】
【Input（X）and output（Y）relay】
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