Bfm #39] Bfm Setting Error Display; Bfm #40 To #48] 64 Bit Ecu Name According To J1939-81 - Mitsubishi Electric MELSEC-F FX3U-J1939 User Manual

FX -J1939 User's Manual
3U
5.16

[BFM #39] BFM Setting Error Display

BFM #29 bit 6 is set to ON if an attempt to write an invalid value into a Buffer Memory is detected.
BFM #39 displays the address of the target BFM of the invalid write attempt. In case an irregular value was
written to more than one BFM, only the address of the first BFM is displayed. When BFM #29 bit 6 is set to
OFF, BFM #39 will be reset to K0.
5.17

[BFM #40 to #48] 64 Bit ECU NAME According to J1939-81

The ECU name is unique for every module in the network and is used for identification. The ECU Name
contains 64 bits. 62 of those bits are defined as shown in the following table.
The remaining 2 bits are reserved by SAE. FX
BFM No.
BFM #40 Industry Group
BFM #41 Vehicle System
BFM #42 Vehicle System Instance
BFM #43 Function
BFM #44 Function Instance
BFM #45 ECU instance
BFM #46 Manufacturer Code
BFM #47 Identity Number (LW)
BFM #48 Identity Number (HW)
*1. FX -J1939 sets the Industry Group to group 5 (Industrial, Process Control, Stationary Equipment) by
3U
default.
*2. FX -J1939 sets the Vehicle System and Function to "not available" as defined in SAE J1939
3U
specification for undefined/unknown Vehicle Systems and Functions.
*3. The Vehicle System Instance, Function Instance and ECU Instance should be set to K0 for the first
object of this kind or if only one object exists in the whole network.
Industry Group
Defines the application field or general environment. Most applications of the FX
"Industrial, Process Control, Stationary Equipment" which equals the default K5.
Vehicle System
In combination with the Industry group, the Vehicle system is used to identify a unit with several functions. In
the case of Industry Group 5, this could be a generator set. The exact function within the generator set unit
will be assigned by the function field. The default value K127 defines the Vehicle System as "Not available" or
"Not yet defined".
Vehicle System Instance
The Vehicle System Instance identifies a certain entity of a Vehicle System in case there is more than one in
the same network.
Function
The Function field defines the particular task of a certain device more specifically. The Default value K255
defines the Function as "Not available" or "Not yet defined".
A device of Industry group K5, Vehicle System K0, Function K129 would identify the generator set controller
(within a generator set system).
Function Instance
The Function Instance identifies a certain entity of a Function in case there is more than one in the same
network.
ECU instance
The ECU Instance identifies a certain entity of an ECU in case there is more than one electronic control unit
with the same function in the same network.
42
Field name Length
3 bit
7 bit
4 bit
8 bit
5 bit
3 bit
11 bit
21 bit
5.16 [BFM #39] BFM Setting Error Display
-J1939 sets the reserved bits automatically to OFF.
3U
Default value
*1
K5
*2
K127 (H7F)
*3
K0
*2
K255 (HFF)
*3
K0
*3
K0
K2047 (H7FF)
H1FFFFF
5 Allocation of Buffer Memories
Remarks
SAE defined
SAE defined
-
SAE defined
-
-
SAE defined
-
-J1939 will be in the
3U