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16 DEVICE/LABEL ACCESS SERVICE PROCESSING SETTING
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16 DEVICE/LABEL ACCESS SERVICE
PROCESSING SETTING
This is a function to optionally designate the frequency of execution of the service process that is carried out by the END
process in the parameter.
Improvement of communication response with peripheral equipment and extension of scan time by the service process can
be controlled by service process setting function. With this, building an optimal service process environment on the system is
possible.
About device/label access service processing
Device/label access service processing is a response process for the request statement from peripheral equipment that
occurs asynchronously with the scan process. (A process of "Interpretation of Request statementInternal processing based
on the requestCreating response statement" for 1 request statement)
The execution timing of the service process is during the END process.
When every request statement from all connected peripheral equipment is executed in each END process,
depending on the number of request statements arriving during 1 scan, the impact on scan time (delay,
scattering) may be big. Therefore, by setting the frequency (number of ports) of device/label access service
processing to be executed in 1 END processing and regulating the frequency of device/label access service
processing according to the system built, ensuring balance between scan time and response time to the
peripheral equipment can be achieved.
Compatibility of service process setting
The compatibility of service process setting is described below.
: Compatible, : Not compatible
Operation details of service process
The operation details of service process are described below.
The following table shows the methods for service process with their respective features.
Communication type Function Compatibility
Serial communication MELSOFT connection
MC protocol communication
MODBUS communication (slave)
N:N Network
MODBUS communication (master)
Non-protocol communication
Inverter communication
Predefined protocol support
Ethernet communication MELSOFT connection
SLMP communication
Socket communication
Predefined protocol support
Device/label access service
processing setting
Scan performance Service process
performance
Device
splitting
*5
Features
Extension
*1
Stability
*2
Response
time
*3
Stability
*4
None Large Medium Fast High None Effective when service process is given
precedence.
Set the frequency of service process Medium High Medium Medium None Effective when scan process is given precedence.