MCTI40N1AB0751G ALSTOM 梯形逻辑控制 通信接口模块

MCTI40N1AB0751G ALSTOM 梯形逻辑控制 通信接口模块

辅助继电器是用软件实现的，它们不能接收外部的输入信号，也不能直接驱动外部负载，是一种内部的状态标志，相当于继电器控制系统中的中间继电器。

PLC 内有很多辅助继电器，它们都不能接收外部的输入信号，也不能直接驱动外部负载，在 PLC 内部只起传递信号的作用，不与 PLC 外部发生联系，是一种内部的状态标志，作用相当于继电器控制系统中的中间继电器。 它的常开、常闭触点在 PLC 内部编程时可无限次使用，该触点不能驱动外部负载，其线圈由 PLC 内的各种软元件的触点驱动，可使程序的逻辑结构更加清晰。

辅助继电器分类

1. 通用辅助继电器

FX系列PLC的通用辅助继电器没有断电保功能。在FX系列PLC中，除了输入继电器和输出继电器的元件号采用八进制外，其他编程元件的元件号均采用十进制。

如果在PLC运行时电源突然中断，输出继电器和通用辅助继电器将全部变为OFF。若电源再次接通，除了因外部输入信号而变为ON的以外，其余的仍将保持为OFF状态。

2. 电池后备/锁存辅助继电器

某些控制系统要求记忆电源中断瞬时的状态，重新通电后再现其状态，电池后备/锁存辅助继电器可以用于这种场合。在电源中断时用锂电池保持RAM中的映像寄存器的内容，或将它们保存在EEPROM中。它们只是在PLC重新通电后的第一个扫描周期保持断电瞬时的状态。为了利用它们的断电记忆功能，可以采用有记忆功能的电路。

MCTI40N1AB0751G ALSTOM 梯形逻辑控制 通信接口模块

Auxiliary relays are implemented by software, they cannot receive external input signals, nor can they directly drive external loads, and are an internal status marker, equivalent to the intermediate relay in the relay control system.

PLC has a lot of auxiliary relays, they can not receive external input signals, can not directly drive the external load, in the PLC only plays the role of transmitting signals, not with the PLC external contact, is an internal status sign, the role is equivalent to the relay control system in the intermediate relay. Its normally open and normally closed contacts can be used unlimited times in the PLC internal programming, the contact can not drive the external load, and its coil is driven by the contacts of various soft components in the PLC, which can make the logical structure of the program more clear.

Auxiliary relay classification

1. General auxiliary relay

FX series PLC general purpose auxiliary relay has no power failure protection function. In the FX series PLC, except for the input and output relays, the component numbers of other programming components are in decimal.

If the power supply is suddenly interrupted while the PLC is running, the output relay and the general auxiliary relay will all be turned OFF. If the power supply is switched ON again, the rest will remain OFF except for those turned on by external input signals.

2. Battery backup/latch auxiliary relay

Battery backup/latch-assist relays can be used in some control systems that require memory of the instantaneous state of power interruption and reproduction of the state after re-powering. Use a lithium battery to preserve the contents of the image registers in RAM or save them in EEPROM during power outages. They only remain in the transient state of power failure for the first scan cycle after the PLC is re-energized. In order to take advantage of their power off memory function, a circuit with memory function can be used.

MCTI40N1AB0751G ALSTOM 梯形逻辑控制 通信接口模块

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