输入状态。ControlLogix系统中的数字输入模块不可用
由控制员调查。相反，模块生成（“多播”）数据
要么是在状态改变时，要么是周期性的。更新的频率
取决于配置期间选择的选项以及
输入模块所在的网络。因此，输入模块是一个
输入数据的生产者，而控制器是数据的消费者。
控制器还可以生成数据供其他控制器使用。这个
生产和消费的数据可由多个控制器通过网络访问
ControlBus背板和ControlNet网络。这些数据
交换符合生产者/消费者模式。
本手册提供了生产商/消费者模型的示例
适用于ControlLogix和PLC-5C控制器。
请注意，PLC-5术语与
ControlLogix。PLC-5C“发送预定消息”功能正常
相当于ControlLogix的“生产标签”PLC5“预定接收
message“在功能上等同于ControlLogix“consumed tag”
In traditional I/O systems, controllers poll input modules to obtain theirinput status. Digital input modules in the ControlLogix system are not
polled by a controller. Instead, the modules produce (“multicast”) their data
either upon a change of state or periodically. The frequency of update
depends upon the options chosen during configuration and where on the
network the input module resides. The input module, therefore, is a
producer of input data and the controller is a consumer of the data.
The controller can also produce data for other controllers to consume. The
produced and consumed data is accessible by multiple controllers over the
ControlBus backplane and over the ControlNet network. This data
exchange conforms to the producer/consumer model.
This manual provides examples of the producer/consumer model as it
applies to ControlLogix and PLC-5C controllers.
Note that PLC-5 terminology differs slightly from that used by
ControlLogix. A PLC-5C “send scheduled message” is functionally
equivalent to a ControlLogix “produced tag.” A PLC5 “receive scheduled
message” is functionally equivalent to a ControlLogix “consumed tag.”
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