Mitsubishi Electric MELIPC MI5000 Series User Manual page 49

Access to guaranteed linked devices
This section shows the method for accessing link devices for which block data assurance per station is enabled.
Before and after normal access to linked devices, read/write data is assured manipulating the start and end of assurance of
read/write data.
(1)
RX, RWr
Ò
Ó
Ô
(1) Master station
(2) Slave station
(3) Cyclic transmission
No. Operation

Start the assurance of read/write data.
• CCPU_StartLinkDeviceAssurance

Read/write the link device.
• CCPU_ReadLinkDevice
• CCPU_WriteLinkDevice

Assurance of read/write data is ended.
• CCPU_EndLinkDeviceAssurance
■Function list
Function name
CCPU_StartLinkDeviceAssurance
CCPU_EndLinkDeviceAssurance
CCPU_ReadLinkDevice
CCPU_WriteLinkDevice
For details on the C Controller module dedicated functions, refer to the following manual.
MELIPC MI5000 Series Programming Manual (VxWorks)
Precautions
After starting data assurance of link devices, always end it. Otherwise, the updating of the input status for own station link
devices and the output status of link devices from own station to other stations does not restart.
RY, RWw
(3)
Status
Update stops of the link device input status for own station (RX, RWr) and the output status (RY,
RWw) from own station to other stations.
■Read data
Update is stopped of the link device input status for own station (RX, RWr), so the read data is
assured.
■Write data
Update of the link device input status from own station (RY, RWw) to other stations is stopped, so the
read data is not sent to slave stations.
Restart refresh of link device input status for own station (RX, RWr) and for output status (RY, RWw)
for own station to other stations. (The own station output status written in Step  undergoes data
assurance and is sent to other stations. )
Description
Starts data assurance for access to a link device of CC-Link IE Field Network.
Ends data assurance for access to a link device of CC-Link IE Field Network.
Reads data from link devices of CC-Link IE Field Network.
Writes data to link devices of CC-Link IE Field Network.
(2)
RX, RWr RY, RWw
6 CC-Link IE Field Network FUNCTION
47
6.1 Cyclic Transmission
6