JP2010061458A5

JP2010061458A5 -

Info

Publication number: JP2010061458A5
Application number: JP2008227280A
Authority: JP
Filing date: 2008-09-04
Publication date: 2011-07-07
Anticipated expiration: 2028-09-04

Claims

In a machine controller system in which one master controller and one or more slave controllers are connected via a communication network,
The slave controller is
A slave scan cycle generation circuit for generating a slave scan cycle;
A synchronization permission unit for synchronizing the slave scan period with the master scan period of the master controller;
With
The synchronization permission unit temporarily lengthens a slave scan period generated by the slave scan period generation circuit when synchronizing the slave scan period with the master scan period when the slave controller is initialized. To machine controller system.

In the master controller, the master scan cycle is synchronized with a communication cycle in which the master controller and the slave controller communicate,
The slave controller is
A slave reference cycle generation circuit that generates a slave reference cycle is provided.
The slave scan cycle generation circuit generates the slave scan cycle by counting the slave reference cycle,
Each time the slave controller receives a synchronization frame in the communication cycle, the synchronization permission unit maintains the synchronization state of the slave scan cycle to the master scan cycle even after synchronization at the time of initialization of the slave controller. The machine controller system according to claim 1 , wherein the slave reference period generation circuit is reset .

The slave controller synchronizes the slave scan period with the master scan period only when the slave scan period is an integral multiple or a fraction of an integral multiple of the master scan period. The machine controller system according to claim 2.

The synchronization permission unit includes a synchronization permission signal as an input and an initial flag as an output when synchronizing the slave scan period with the master scan period,
The reset signal for resetting the slave reference cycle generation circuit is output every time the synchronization frame is received after the synchronization permission signal is written to the synchronization permission unit, and the initial flag is the synchronization flag. After the permission signal is written in the synchronization permission unit, it is output only when the synchronization frame is first received,
The slave reference period generation circuit does not output a slave reference period signal while the initial flag is input,
The slave scan cycle generation circuit is reset only when the reset signal is input while the initial flag is input, and does not output the slave scan cycle signal while the initial flag is input The machine controller system according to claim 2 , wherein the machine controller system is a machine controller system.

  In a synchronization method of a machine controller system in which one master controller and one or more slave controllers are connected via a communication network and communicate with each other at a constant communication cycle,
  The master controller sends a master scan period to the slave controller;
  The slave controller returns the result of determining whether synchronization is possible or not to the master controller,
  When the master controller returns that the slave controller can be synchronized, a synchronization start request and a scan counter value obtained by counting the master scan period in the communication period are transmitted to the slave controller,
  The slave controller performs synchronization processing when receiving the synchronization start request and the scan counter value, and transmits the synchronization completion to the master controller when the synchronization processing is completed. Synchronization method.

The determination of whether or not synchronization is possible is made by determining that the communication cycle is an integer multiple of the master scan cycle or a fraction of an integer, the slave scan cycle is an integer multiple of the communication cycle or a fraction of an integer, and the slave scan cycle is a master scan. 6. The machine controller system synchronization method according to claim 5, wherein the synchronization is determined to be possible when both of an integral multiple of a period or a integral fraction of 1 are satisfied.

The synchronization process monitors the scan counter value transmitted from the master controller and detects the master scan start timing, and then resets the slave reference period for each communication period. Without outputting a periodic signal
7. The machine controller system synchronization method according to claim 5, wherein the slave scan period is reset only by an initial reset signal and no slave scan period signal is output at that time.

The detection of the master scan start timing is performed by determining whether or not the scan counter value is equal to a preset value. A method of synchronizing the machine controller system described.