Layer 2 Rtr Flags - Mitsubishi Electric MELSEC-F FX3U-CAN User Manual

FX -CAN User's Manual
3U
9.4

Layer 2 RTR Flags

If the FX -CAN is set to Layer 2 communication mode, an incoming RTR message is indicated in the BFM if
3U
the following conditions are satisfied:
• Matching the "CAN-ID n
• The Layer 2 message "n
• The Layer 2 message "n
*1. Where "n" is one of the Layer 2 messages 1 to 42.
The bits in the "RTR message reception list" are updated independently from BFM #20 bit 0.
A bit is set if a valid RTR message has been received. The bit can be evaluated by PLC program and
required changes to the response message data can be made (BFM #20 bit 0 must be set in order to refresh
the internal data buffer and trigger the transmission). The flag is automatically reset when a message is
transmitted from the Layer 2 message.
RTR message reception list
BFM No.
BFM #1270
BFM #1271
BFM #1272
*1
" of one of the Layer 2 messages
*1
" is configured as a transmit Layer 2 message
*1
" is set to "no auto RTR response" (H6FFF)
Bit No.
Bit 0 RTR message for Layer 2 message 1 received
Bit 15 RTR message for Layer 2 message 16 received
Bit 0 RTR message for Layer 2 message 17 received
Bit 15 RTR message for Layer 2 message 32 received
Bit 0 RTR message for Layer 2 message 33 received
Bit 9 RTR message for Layer 2 message 42 received
Bit 10
Unused
Bit 15
Description
9 CAN Layer 2 Mode
9.4 Layer 2 RTR Flags
Read/Write
R
R
R
R
R
R
R
R
R
R
175
1
2
3
4
5
6
7
8
9
10