Pre-Defined Layer 2 Transmit Messages - Mitsubishi Electric MELSEC-F FX3U-CAN User Manual

FX -CAN User's Manual
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9.3.1

Pre-defined Layer 2 transmit messages

This subsection describes parameters A to D for the transmit message.
Parameter
Layer 2 message number parameter A
Layer 2 message number parameter B
Layer 2 message number parameter C
Layer 2 message number parameter D
1. Parameter A and B for each Layer 2 message
A message buffer in BFM #100 to #393 is assigned to a Layer 2 transmit message by writing HFFFF in
parameter A, and writing H7FFF, H6FFF or H5FFF in parameter B.
When Layer 2 message number is not used, set HFFFF to both parameter A and B.
Note
The Layer 2 implementation of the FX
(parameter B = H7FFF or H6FFF). If the configuration violates this rule, the first 28 transmit message
configurations remain as they are, and RTR handling is disabled for any further transmit messages as
parameter B is forced to H5FFF.
• When using the auto RTR response
Set H7FFF to parameter B for the Layer 2 message.
The FX -CAN automatically responds to Remote Transmit Requests (RTRs) if the 11/29 bit CAN-ID (i.e.
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set in BFM #100) matches the ID in the RTR message.
The RTR message is not stored to the RTR flag list.
• When using the manual RTR response
Set H6FFF to parameter B for the Layer 2 message.
The FX -CAN will not automatically respond to Remote Transmit Requests, but the RTR ID will be added
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to the RTR flag list.
• When using the disable RTR handling
Set H5FFF to parameter B for the Layer 2 message.
The FX -CAN will discard any incoming RTR telegrams matching the CAN-ID of this Layer 2 message.
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Description
Constant HFFFF
H7FFF (auto RTR response)
H6FFF (manual RTR response)
H5FFF (disable RTR handling)
HFFFF (message disabled)
Transmission type
Cycle time in [10 ms]
-CAN can handle up to 28 transmit slots with RTR handling
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→ For the RTR message reception list, refer to Section 9.4
9 CAN Layer 2 Mode
9.3 Pre-defined Layer 2 Message Configuration
Initial value
HFFFF
HFFFF
H0000
H0000
1
2
3
4
5
6
7
8
9
10
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