MTS Series 793 - Manual (Page 168)

Note:
A Series 793 Controller equipped with a CAN bus controller card is considered another CAN device
(node) on the CAN network, and capable of sending and receiving CAN messages.
CAN inputs and outputs
The MTS test applications that run on a Series 793 Controller use CAN input and output resources to share
signals, commands, and other information with other devices on a CAN network. Each input and output must
be assigned to a CAN message.
• CAN input and output resources are created using the Station Builder application. Use CAN input/output
resources like any other resources in your station configuration.
• Configure CAN inputs and as data fields using the CAN Bus Editor in the Station Setup window of the
Station Manager application.
• You can also define inputs and outputs in a CANdb (.dbc) file that the Station Builder application can use
to create inputs and outputs.
Important:
Most settings for inputs/outputs defined in a CANdb file are not editable in the Station Manager
application.
CAN messages
Each CAN input and output must be assigned to a CAN input or output message. Once assigned, CAN inputs
and outputs appear as fields in the CAN message. CAN messages may contain multiple input or output fields
along with other data fields.
Each message requires a unique CAN message ID that determines which CAN devices will receive and/or
transmit the message. Message IDs and other CAN information can be entered as either decimal numbers
or hexidecimal format. Incoming messages can be filtered based on message ID.
• Outputs/Actions—The CAN device will read the signal value based on the data format that you define
for the output field.
• Inputs—The MTS controller will read the incoming signal value from the CAN device based on the data
format that you define for the input field.
CAN bus message throughput
The rate at which messages can be sent (maximum messages/sec) on the CAN bus must be determined
experimentally and depends on a number of factors including:
• The CAN bus communication baud-rate HWI setting
• FlexTest controller processor usage
• The message size(s)
• The number of devices on the CAN bus
About the CAN Bus Editor
Before you can use the Station Manager CAN Bus Editor tool, you must use the Station Builder application
to create CAN inputs and outputs and assign CAN bus ports to the station. You can then use the CAN Bus
Editor to create and edit CAN messages where you can assign CAN inputs and outputs. CAN inputs and
outputs that are assigned to a CAN message appear as fields in the CAN message.
168 MTS Series 793 Control Software
Station Manager Application