Cyclic Data Assurance - Mitsubishi Electric MELSEC iQ-R Series User Manual

Cyclic data assurance

This function assures the cyclic data integrity in units of 32 bits or station-based units.
The methods for assuring the cyclic data are as follows:
: Available, : Not available
Method
32-bit data assurance
More than 32-bit data Station-based block data
assurance assurance
Interlock program
32-bit data assurance
This method assures link device data in 32-bit units.
However, conditions for data assurance vary depending on network modules. To assure 32-bit data, refer to the manual of a
network module. (Manual of a module used)
■Access by a user program
When accessing devices with a user program, the 32-bit data can be assured by satisfying the following conditions:
• Access size is 4 byte (32 bits).
• The start device of a target device or the start address of buffer memory is 0 or a multiple of 2. (when a target device is a bit
device, the start device will be 0 or a multiple of 20H.)
16 NETWORK MODULE ACCESS FUNCTION
162
16.1 Cyclic Transmission
Description
To assure data in 32-bit units. Data is
automatically assured by satisfying
assignment conditions of link
devices.
To assure data in station-based units.
Data is assured by enabling the
station-based block data assurance
in the parameter setting.
To assure data of more than 32 bits.
Data is assured by creating interlocks
on programs.
Availability of assurance
Link refresh Direct access
 
 
 
Buffer memory
access


