Mitsubishi Electric MELSEC-F FX3U-CAN User Manual page 178

FX -CAN User's Manual
3U
2. Parameter C "transmission type" for each Layer 2 message
The transmission type defines the transmit/receive message and transmission trigger event of the message
as follows.
Transmission
Type value
K0
K1
K2
K3
K4
3. Parameter D "cycle time" for each Layer 2 message
This parameter is used when the transmission type (event) is set to K2 or K3.
The cycle time is in units of ms
Note
• The cycle time should be set in consideration of the PLC scan cycle and communications response time,
etc.
• If cycle time is set to K0, cycle time operates as 1 ms.
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Message Type
When BFM #20 bit 0 is set to ON, the Layer 2 message is always transmitted.
When BFM #20 bit 0 is set to ON, the Layer 2 message is transmitted.
However, if data has not been changed, it is not transmitted.
The Layer 2 message transmits with following condition.
• With a cycle time set by parameter D
• BFM #20 bit 0 set to ON
The Layer 2 message transmits with following condition.
However, if data has not been changed, it is not transmitted.
Transmit
• With a cycle time set by parameter D
message
• BFM #20 bit 0 set to ON
The Layer 2 message transmits with following condition.
• Request via RTR frames
Request via RTR frames works for maximum 28 transmit messages.
• Message transmit trigger flags
The Layer 2 message transmits when the corresponding message transmit trigger flag in BFM
#1280 to #1282 is set to ON.
9.3 Pre-defined Layer 2 Message Configuration
Transmission Trigger Event
→ For the message transmit trigger flag, refer to Section 9.5
9 CAN Layer 2 Mode