Safety Output Module Operation

Only the owner-controller makes an output connection with the safety module and sends output data to the safety module.
IMPORTANT:
Immediate Output instruction is not supported in safety applications.
The controller sends data to an output module at the output RPI, and the output module sends data to the controller at the input RPI. For example, the output module sends an indication of the point data quality.
IMPORTANT:
The RPI for an output safety module is the Safety Task period. Safety output data is sent at the completion of the Safety Task scan.
The output modules reside in an I/O system that is accessible to a Logix 5000 controller over an EtherNet/IP network.
An EtherNet/IP adapter is the first component in an I/O system and connects the system to the EtherNet/IP network. Output modules receive output data from a controller. The output module also sends data to the controller.

Controller to Output Module Data Transmission

The output RPI is the same as the controller safety task period.
These events occur when the controller sends data to an output module.
  1. Data is sent in one of the following ways:
    • If the controller is directly connected to the EtherNet/IP network, it sends data to the network.
      In this case, skip to step 3.
    • If the controller is connected to the EtherNet/IP network via a communication module, the controller transmits the data to the backplane.
      In this case, proceed to step 2.
  2. The EtherNet/IP communication module transmits the data to the EtherNet/IP network.
  3. The PointMax EtherNet/IP adapter in the PointMax I/O system receives the data from the network and transmits it to the backplane.
  4. The digital output module receives the data from the backplane and behaves as dictated by its configuration.

Output Module to Controller Data Transmission

The output module sends readback data and status to the controller at input RPI.
The following events occur when an output module sends data to the controller at input RPI.
  1. The module sends the data to the backplane.
  2. The PointMax EtherNet/IP adapter in the PointMax I/O system sends the data over the EtherNet/IP network.
  3. One of the following occurs:
    • If the controller is directly connected to the EtherNet/IP network, it receives the input data from the network without need for a communication module.
    • If the controller is connected to the EtherNet/IP network through another communication module, the module transmits the data to its backplane and the controller receives it.
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