1.5.5 Device function specification
Auxiliary relay (M)
There are many auxiliary relays in PLC, they can be divided into general, power off keep and special three
categories, the address code of auxiliary relay is according to decimal code. Specific configurations are as
follows:
General auxiliary relay
The general-purpose auxiliary relay is similar to the intermediate relay in the electrical control circuit, and can
be used as an intermediate state storage and signal conversion. The auxiliary relay can only be driven by the
contacts of various soft devices in the PLC. The auxiliary relay has countless normally open and normally
closed contacts that can be used indefinitely, but it cannot directly drive an external load.
Power off keep auxiliary relay
In the PLC running state, the power off keep auxiliary relay will save the state before the inverter is
completely powered off. When the inverter is powered again, the power off keep auxiliary relay will continue
to be used in the state before the power failure.
Special auxiliary relay
Special auxiliary relays are auxiliary relays with a certain function. Do not use undefined special auxiliary
relays. For detailed description, see 1.5.4.
Timer T
The timer is equivalent to the time relay in the electrical control circuit and can be used for delay control in the
program. The address number is a decimal code. The built-in PLC function has only one type of timer, the
timing mode is upward timing, which is accumulated once in 100ms, and the range is 0~6553.5s. There are
eight points, namely T0~T7, and their address numbers are decimal coded.
In addition to its own numbered memory, the timer also occupies a set value register and a current value
register. The current set value register stores the timing set value set by the program. The current value of
the current register records the timing. These registers are all hexadecimal memory. The actual timing time is
the set value * time unit. When the current register count value is equal to the set value in the set value
register, the timer output contact will act. The timer can use a decimal constant (K) as the set value, or it can
be set indirectly using the data register (D).
Counter C
The counter is used for counting control in the program. The built-in PLC counter has only one type of 16-bit
up counter, ranging from 0 to 65535. Eight points are C0~C7. 16-bit means that its set value register and
current value register are binary 16-bit registers, and its set value is in the range of 0~65535.
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