Chapter 18 Device/Label Access Service Processing Setting - Mitsubishi Electric FX5 User Manual
Melsec iq-f series
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- Programming manual (1112 pages) ,
- User manual (958 pages) ,
- Reference manual (44 pages)
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18
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 statement→Internal processing based
on the request→Creating 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.
Communication type
Serial communication
Ethernet communication
: 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.
Device/label access service
processing setting
None
Set the frequency of service process
18 DEVICE/LABEL ACCESS SERVICE PROCESSING SETTING
126
Function
MELSOFT connection
MC protocol communication
MODBUS communication (slave)
N:N Network
MODBUS communication (master)
Non-protocol communication
Inverter communication
Predefined protocol support
MELSOFT connection
SLMP communication
Socket communication
Predefined protocol support
Scan performance
Service process
performance
Extension
Stability
Response
*1
*2
*3
time
Large
Medium
Fast
Medium
High
Medium
Compatibility
Device
Features
splitting
*5
Stability
*4
High
None
Effective when service process is given
precedence.
Medium
None
Effective when scan process is given precedence.
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