A CPU Unit with unit version 1.03 or later and Sysmac Studio version 1.04 or higher are required
to use differential monitoring.
You can use differential monitoring to check or count the number of times an external input signal turns
ON or OFF or a input in the user program changes to TRUE or FALSE. This is useful during system
commissioning and for troubleshooting operation failures during production.
The specifications of differential monitoring are given in the following table.
The variables and the changes that you can monitor with differential monitoring are called differential
monitoring conditions. The specifications for the differential monitoring conditions are described below.
Number of Variables
You can specify a maximum of eight variables. This means differential monitoring can detect the
numbers of times conditions are met for eight variables in parallel.
Specified Variables
The data types of the variables that you can specify for differential monitoring are given below.
• BOOL
• Elements of BOOL arrays
• BOOL members of structures or unions
Application
Specifications of Differential Monitoring
Item Specification
Differential monitoring
condition
Number of variables 8 max.
Specified variables • BOOL
• Element of BOOL array
• BOOL member of structure or union
Condition expres-
sion
• Change to TRUE
• Change to FALSE
Conditional match
evaluation
Timing Once every primary period
Match count The number of times the specified variable matches the
condition is counted.
Starting and stopping Start condition Command from Sysmac Studio
Stop condition • Command from Sysmac Studio
• Occurrence of a major fault level Controller error
• User program download
• Clear All Memory operation
• Disconnecting online connection to Sysmac Studio
Operating modes • RUN mode
• PROGRAM mode
Differential Monitoring Conditions
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