Mitsubishi Electric MELSEC iQ-R Series User Manual page 40

Job setting 1
Action
Operation action (substitution)
Job setting 2
Action
DB communication action (Multiple
Select)
Operation action (substitution)
Job setting 3
Action
DB communication action (Multiple
Select)
Operation action (substitution)
Reading/writing in access units
When the number of accessed device points is equal to the access unit or less, device values in a same sequence scan are
obtained and applied.
When the number of device points exceeds the access unit, device values may be obtained from multiple sequence scans
and applied, which may cause data inconsistency.
When data inconsistency is a problem
When a sequence program and data must be synchronized and data inconsistency is a problem, set the following:
• Set the number of device points accessed at the same time to the access unit or less.
• Change the access type to high-speed access. (Only for device reading)
• Select "Single Handshake" or "Multiple Handshake" for "Configuration Type" for a trigger condition.
2 SPECIFICATIONS
38
2.2 Access Specifications for a CPU Module
Details
Either of the following conditions is satisfied.
• All device tag components are devices other than bit devices.
• The array sizes of all device tag components are multiples of 16.
Details
All device tag components are devices other than bit devices.
Either of the following conditions is satisfied.
• All device tag components are devices other than bit devices.
• The array sizes of all device tag components are multiples of 16.
Details
All of the following conditions are satisfied.
• All device tag components are bit devices.
• The array sizes of all device tag components are multiples of 16.
• The checkbox of "Clear the unsubstituted assignment data to 0" is selected under "Operation Setting at the No. of
Selected Records Insufficient."
Either of the following conditions is satisfied.
• All device tag components are devices other than bit devices.
• The array sizes of all device tag components are multiples of 16.