Introduction; Procedure To Readdress Can Product Control Nodes - Raven SCS 4600 Operator's Manual

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INTRODUCTION

Controller Area Network, or CAN, is a high-integrity serial data communications bus for real-time control

applications. CAN messaging within the agriculture industry operates at a data rate of 250 kilobits per

second. The CAN protocol also has excellent error detection and error confinement capabilities, making

it very suitable and reliable for agriculture applications.

CAN applications allow for additional products to easily be added to a control system at any time. The

SCS 4600 allows for up to three products in the control system (two additional via the CAN bus). The

products may be any combination of liquid, granular, chemical injection, or spinner control applications.

Two CAN terminators are required as means of terminating the CAN bus lines to provide optimal signal

integrity. The terminators should be located at each end of the CAN bus. CAN power, obtained from

switched power, runs throughout the bus to act as a shield.

To add products to the system, simply remove the terminator from the end of the CAN bus, tie into the

CAN bus using a "T" extension cable (Raven P/N 115-0171-326 [6'], 115-0171-362 [12'], 115-0171-363

[24'], or 115-0171-364 [6"]), provide high current power (if applicable) and logic power to the control node

using the control node cable, connect to the appropriate sensors and valves (if applicable), and replace

the terminator on the end of the CAN bus. Power to the CAN node(s) should be obtained from a switched

power source capable of handling the required current for the given node(s). The required current can be

approximated from the fuse rating of the fuse within the power leads. Relay, Raven P/N 415-1001-009

can provide up to 40 Amps and should be wired as seen in the following diagrams. The node(s) will

automatically be recognized upon reboot of the console.

Although the control algorithm, or "brains", is located within the CAN node, all of the same troubleshoot-

ing techniques as used in a traditional hard-wired system still apply. CAN allows for modularization of the

control system, but the behavior of the system remains the same. Flow and speed sensors, as well as the

control valve and boom valves are used in the same fashion.

The following diagrams show individual control modules that can be added to a CAN system. For con-

necting multiple CAN modules, connect the modules in series and place a terminator at the end of the

CAN bus.

From CAN submenu of DATA MENU, select "PRESS ENTER TO READDRESS PROD NODES" and

press ENTER. Console will display "REBOOT NODES IN SEQNC, PRESS ENTER WHEN DONE." At

this point, CAN product control nodes should be rebooted, or repowered, in the order they are to be

addressed. For instance, to assign Product Control Node 1, reboot the desired node first, Product Con-

trol Node 1 should be rebooted second, etc. To reboot a control node, either disconnect the power

connector to the node or pull the fuse on the logic power wire (typically the 5 Amp fuse), wait a few

seconds, then reconnect. When finished rebooting all product control nodes, press ENTER on the con-

sole to resume operation.

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