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ProAct P-Series FL Position Controller
Manual 26659
70
Woodward
Chapter 7.
CAN Details
Overview
The ProAct P-Series FL Actuator supports CAN communications in the SAE
J1939 Higher Layer Protocol format. Further detailed information regarding the
J1939 Standards Collection can be purchased at
www.sae.org
. Information
about CAN is included in ISO 11898. Specific information regarding ProAct P-
Series FL behavior is detailed below.
All ProAct P-Series FL J1939 messages use the CAN 2.0B 29-bit Extended Data
Frame Format.
The ProAct P-Series FL has one transmitted (data) message and one receive
message for commands. A Legacy mode is provided to allow for backward
compatibility for most ProAct ISC and ProAct Digital Plus messages. The legacy
mode does not provide the heartbeat message. Details on each message are
provided below.
Harness Coding
The ProAct P-Series FL has 4 possible source addresses that are set through
harness coding to the configured Discrete Inputs (CAN ID High and CAN ID
Low). If Legacy mode is configured, the Source Addresses are 19, 20, 21, and
22, otherwise they are set to the user-configured value. The source address is
determined on power-up when the discrete inputs are initially read.
Unit
Can
ID
Can
ID
Source
Source
Address
Number
High
Low
Address
(Legacy
mode)
1
Off
Off
configurable 0x13
(19)
2
Off
On
configurable 0x14
(20)
3
On
Off
configurable 0x15
(21)
4
On
On
configurable 0x16
(22)
Table 7-1. Source Address by Harness Code
CAN Bit Timing
Bit timing is 250 kbps by default, but configurable as 125 k, 250 k, 500 k, and 1 M
bits/s.
CAN Messages Overview
The following information will be sent via CAN:
Actual Valve Position
Desired Valve Position
Internal Electronics Temperature*
Diagnostics (Alarms and Shutdowns)
These are all provided in one data message (2 messages in Legacy mode).