Ionet Layer - GE Mark VIe System Manual

Note Root and edge switches are not interchangeable.
Each edge switch connects back to a corresponding root bridge switch through the trunks. There is only one root bridge
switch group in the system. Special configuration files define which switch acts as the root or edge. In addition, the edge
switch ports are specially configured to provide the PDH, UDH, or MDH. Typically, ports 1–10 are PDH, ports 11–22 are
UDH, and 23–24 are MDH (refer to the label on the switch itself for specific port details).
Depending on specific site network requirements, the Cisco 2960S can be supplied as a root bridge switch on jobs with up to
four units. Cisco 3750X switches serve as the root bridge at sites with more than four units.

3.2 IONet Layer

IONet communication is internal between the controller(s) and the I/O modules through an unmanaged IONet switch. IONet
redundancy can be one, two, or three networks, and is equal to the controller redundancy. The following cable color-coding
for RJ-45 hoods is used to reduce the chance for cross connecting:
Note On the UCSx controller from top to bottom, the networks are T, S, R.
• Blue for IONet 3 (T network)
• Black for IONet 2 (S network)
• Red for IONet 1 (R network)
Note Refer to the section
Controller Redundancy
The IONet provides direct communication between controllers and I/O modules. IONet EGD protocol (which is different than
UDH EDG protocol) is used. The I/O modules send their inputs to the controllers and the controllers send their outputs to the
I/O modules each frame, as displayed in the section
• Status of control system input data from the I/O packs to the controller set
• Status of control system output data from the controller set to the I/O packs
• I/O pack configuration data from the ToolboxST application to the controller to the I/O packs
• I/O pack health status data from the packs to the controller
• Field device input data from the I/O pack to the controller
Note The ESWx switch is used for IONet communication.
The sharing of input data between two control sets
• One Mark VIeS Safety controller set and one Mark VIe controller set
• One Mark Stat controller set and one Mark VIe controller set
• Two Mark VIe controller sets
Note A control set is the group of controllers (based on redundancy) with the set of owned I/O modules. From the
ToolboxST System Editor Summary View, a control set displays as a single controller.
80 GEH-6721_Vol_I_BP
for more information.
Rate of Response. Examples of IONet traffic are as follows:
(Shared IONet) on a single IONet is available for the following controllers:
GEH-6721_Vol_I Mark VIe and Mark VIeS Control Systems Volume I
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