J1939 Node Configuration

Configure J1939 node with address and network management attributes

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Libraries:
Simulink Real-Time / J1939 Communication
Vehicle Network Toolbox / J1939 Communication

Description

The J1939 Node Configuration block is where you define a node and associate it with a specific network configuration. Its Message information is read from the database for that configuration, unless you are creating and configuring a custom node.

To use this block, you must have a license for both Vehicle Network Toolbox™ and Simulink^® software.

The J1939 communication blocks support the use of Simulink accelerator and rapid accelerator modes. You can speed up the execution of Simulink models by using these modes. For more information on these modes, see Acceleration.

The J1939 communication blocks also support code generation that have limited deployment capabilities. Code generation requires a C++ compiler that is compatible with the code generation target. For the current list of supported compilers, see Supported and Compatible Compilers.

Examples

Basic J1939 Communication Over CAN

Apply J1939 blocks for basic communication over CAN protocol.

• Open Live Script

Ports

Output

Address — Returns the effective address of the node

int8

This optional output port exists when you select the Output current node address check box in the dialog box.

AC Status — Indicates the success (1) or failure (0) of the node’s address claim

0 | 1

This optional output port exists when you select the Output address claim status check box in the dialog box.

Parameters

Config name — ID of the J1939 network configuration to associate with this node

ConfigX (default) | character vector

To access the corresponding J1939 database, use this ID.

Node name — name of this J1939 node

NodeX (default) | character vector

The available list shows none if no J1939 network configuration is found or no node is defined in the associated database. If you are creating a custom node, the node name must be unique within its J1939 network configuration.

Message — Nine network attributes as defined by the database file consistent with the J1939 protocol

vector array

Unless you are defining a custom node, these parameters are read-only:

• Allow arbitrary address — Allow/disallow the node to switch to an arbitrary address if the station address is not available. If this option is off and the node loses its address claim, the node goes silent.

  Node Address — Station address, decimal, 8-bit.

• Industry Group — Decimal, 3-bit.

• Vehicle System — Decimal, 7-bit.

• Vehicle System Instance — Identifies one particular occurrence of a given vehicle system in a given network. If only one instance of a certain vehicle system exists in a network, then this field must be set to 0 to define it as the first instance. Decimal, 4-bit.

• Function ID — Decimal, 8-bit.

• Function Instance — Identifies the particular occurrence of a given function in a vehicle system and given network. If only one instance of a certain function exists in a network, then this field must be set to 0 to define it as the first instance. Decimal, 5-bit.

• ECU Instance — This 3-bit field is used when multiple electronic control units (ECU) are involved in performing a single function. If only one ECU is used for a particular controller application (CA), then this field must be set to 0 to define it as the first instance.

• Manufacturer Code — Decimal, 11-bit.

• Identity Number — Decimal, 21-bit.

Sample time — Simulation refresh rate

0.01 (default) | double

Specify the sampling time of the block during simulation. This value defines the frequency at which the J1939 Node Configuration updates its optional output ports. If the block is inside a triggered subsystem or inherits a sample time, specify a value of -1. You can also specify a MATLAB^® variable for sample time. The default value is 0.01 simulation seconds. For information about simulation sample timing, see What Is Sample Time?.

Output current node address — Enable or disable the Address port display

off (default) | on

Enable or disable the Address output port to show the effective address. The effective address is different from the predefined station address. If Allow arbitrary address is selected, a name conflict occurs, and the current node has lower priority. The output signal is a double value from 0 to 253. This port is disabled by default.

Output address claim status — Enable or disable the address claim AC Status display

off (default) | on

Enable or disable the address claim AC Status output port to show the success of an address claim. The output value is binary, 1 for success or 0 for failure. This port is disabled by default.

Version History

Introduced in R2015b