Lenze DDS System bus CAN for PLC - Manual (Page 49)

System bus (CAN) for Lenze PLC devices
"CAN" system bus interface configuration
3−15
l
PLC−Systembus EN 2.0
3.13.3 Bus load by the PLC
Via C0361 you can receive a percentage display of the extent to which the system bus is loaded by
the telegrams of the PLC.
·
Only valid telegrams are considered.
·
Each transmit and receive channel is evaluated separately.
Code LCD Possible settings Information
Lenze Selection
C0361 Load IN/OUT g 0 {1 %} 100 System bus − bus load
·
Trouble−free operation demands
that the total bus load (all
connected devices) does not
exceed 80 %.
1 Load OUT All sent
2 Load IN All received
3 Load OUT1 Sent on CAN_OUT1
4 Load OUT2 Sent on CAN_OUT2
5 Load OUT3 Sent on CAN_OUT3
6 Load POUT1 Sent on parameter data channel 1
7 Load POUT2 Sent on parameter data channel 2
8 Load IN1 Received from CAN_IN1
9 Load IN2 Received from CAN_IN2
10 Load IN3 Received from CAN_IN3
11 Load PIN1 Received from parameter data
channel 1
12 Load PIN2 Received from parameter data
channel 2
Limits of the data transmission
Data transmission is limited by the number of telegrams per time unit and by the data transmission
speed.
·
For a data exchange within a drive system only consisting of Lenze controllers/PLCs, these
limits can be determined by adding code C0361/1 of all devices involved.
·
Example: Three controllers are connected to each other via the system bus:
Value of C0361/1 on controller 1: 23.5 % bus load
Value of C0361/1 on controller 2: 12.6 % bus load
Value of C0361/1 on controller 3: 16.0 % bus load
52.1 % total bus load
Tip!
·
The bus load of all devices involved should not exceed 80 %.
·
If other devices, like for example decentralised inputs and outputs are connected, these
telegrams are to be considered also.
·
A bus overload for instance can be effected by an event−controlled transmission of continually
changing signals.
– Remedy: Accordingly alter the setting of the cycle time for CAN2_OUT or CAN3_OUT, so
that the total of all bus loads does not exceed the value of 80 %. ( ^ 3−6)