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Buffer Memory Details: Layer 2 Message Mode
● Transmission: Layer 2 message n parameter C "transmission type"
The transmission type defines under which conditions a transmit message is sent.
"Transmission type"
Tab. 3-32: Description of the setting values for "transmission type"
The request via RTR frames works for a maximum of 28 transmit messages.
Additionally the transmission can be triggered if the corresponding flag in Un\G8350–Un\G8352
is set to ON. (Refer to section 3.6.3)
● Transmission: Layer 2 message n parameter D "cycle time"
The parameter "cycle time" is valid only if the parameter "transmission event" is set to 2 or 3 (time
triggered).
The cycle time sets the interval for message transmission in units of ms. A value of 0 will be forcibly
set to 1 (1 ms).
– "Transmission type" = 2 will trigger the transmission every interval.
– "Transmission type" = 3 will trigger the transmission only if the data was changed since the
last transmission.
MELSEC-L Series – CANopen€ Module ME3CAN1-L
Description/transmission trigger event
value
0
When Yn1 is set to ON, the Layer 2 message is always transmitted.
When Yn1 is set to ON, the Layer 2 message is transmitted.
1
However, if data has not been changed, it is not transmitted.
Time triggered
Data refresh by Yn1
2
Time set by parameter D "cycle time"
Time triggered
Data refresh by Yn1
3
Time set by parameter D "cycle time"
Message is not sent if data did not change
4
On request or PLC/User trigger only
Detailed Description of the Module
3 – 35
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