00194614-08 Trainingsdoku. SG X-Serie_X4i SW70x (AL2)_EN - 第92页
Communication and Control CAN Bus Structure CAN Bus Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 92 CAN Bus Concept Siplace X2 4.3.3.1 CAN Bus Concept Siplace X2 CAN Bus overall overview X2 The placement machine SIP…
Communication and Control
CAN Bus CAN Bus Structure
91 Student Guide SIPLACE X-Serie and X4I SW70x (AL2)
If bus subscriber A and B want to transmit, they begin to do so after the start-of-frame bit and compare
in each case the bits sent and received. Since"0" dominates on the bus, bus subscriber B recognizes
that the fourth bit differs from the bits sent and therefore withdraws from the bus until the next start-of-
frame. Bus subscriber A does not recognize a difference and therefore continues to transmit. Messages
with high priority therefore have an identifier which begins with several "0"s.
There are two bus states possible during arbitration: dominant and recessive.
Errors on the CAN Bus
4.3.2.3 Errors on the CAN Bus
Error frames
▪ What are error frames?
Error frames are sent by the individual subsystems, if a command does not correspond with the
coding rules or if it has been corrupted i.e. when a CAN telegram has 6 or more consecutive bits with
the same level (high or low).
If a command is recognized by a subscriber, this subscriber immediately informs the other
subscribers and the telegram sender, by issuing an error frame.
Upon receipt of the error frame, all subscribers reject the telegram received and begin to send their
own error frames.
Once the bus is free again, the commend is resent.
▪ If multiple error frames are issued, this indicates that a physical bus error has occurred. If too many
error frames are recognized during operation, a detailed analysis of the CAN signals is required.
CAN Bus Structure
4.3.3 CAN Bus Structure
NOTICE
► In SIPLACE X machines, the machine controller is a box PC. This also contains the COM
unit.
► From approx. 2008 machines will not have separate illumination control as this is realized
in the stationary cameras from version 4 onwards. The NCs are addressed and the sensors
monitored by the CAN node module. The NC is therefore reintegrated into the CAN bus
system.
NOTICE
X series/X4I with SW 702
In these machines the first BoxPC assumes the control function for the entire machine. The
second BoxPC is used as a Vision computer in these cases.
Communication and Control
CAN Bus Structure CAN Bus
Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 92
CAN Bus Concept Siplace X2
4.3.3.1 CAN Bus Concept Siplace X2
CAN Bus overall overview X2
The placement machine SIPLACE X2 uses a bus system with 1 Mbit/s transmission rate.The CAN: Bus
system begin at the Communication board and is split in 2 path. Every path is terminated by a 120 ohm
terminator on the head board at the individual placement head.
NOTICE
When the Twin head is mounted, the switch for the terminator on the head board (C500) must
be OFF.
Communication and Control
CAN Bus CAN Bus Structure
93 Student Guide SIPLACE X-Serie and X4I SW70x (AL2)
CAN Bus Concept SiplaceX3
4.3.3.2 CAN Bus Concept SiplaceX3
CAN Bus overview SIPLACE X3
The placement machine SIPLACE X3 uses a bus system with 1 Mbit/s transmission rate. The bus
system begins at the communication board and is split in 2 paths. Every path is terminated by a 120 ohm
terminator on the head board at the individual placement head.
NOTICE
When the Twin head is mounted, the switch for the terminator on the head board (C500) must
be OFF.