YOKOGAWA STARDOM FCN-RTU User Manual

<2. Basic Design and Function Design>
12
TI 34P02K35-02E
Jun. 6, 2018-00
2.2.2 Checking FCN-500, FCN-RTU Control Application Size
Estimate the size of an FCN500 or FCN-RTU control application from the
requirement specification and ensure that there is no problem.
SEE ALSO
For details on how to estimate the size of an application, see Section 4.5.2, “Calculation of Control
Application Capacity" of TI "FCN-500 Technical Guide," Section 4.5.2, “Calculation of Control
Application Capacity" of TI "FCN-RTU Technical Guide."
Estimate the control application size by estimating the ADLST size and retain data
size as described in TI “STARDOM Technical Guide.”
To investigate the utilization of application resources, calculate the respective
utilization rates of ADLST capacity of retain data capacity, and take the larger of
the two values as the system-wide utilization rate.
The checking items described in this section is based on calculated values, which
should be verified by checking the actual control application size during function
test.
SEE ALSO
For details, see Section 5.5.2, “Checking Application Size.”
• For projects using NPAS POUs
Projects using NPAS POUs usually exceed the ADLST size limit (if ever it is
exceeded) before exceeding the retain data size limit.
Therefore, first estimate the ADLST size, and if it is within the 4MB upper limit,
you can assume that there is no application size problem.
You can also use the ADLST utilization as an indicator of the utilization of the
control application.
• For projects not using NPAS POUs
For projects not using NPAS POUs, the ADLST size and retain data size
depend on how many variables are specified with OPC property and RETAIN
property during engineering.
In this case, estimate both ADLST size and retain data size and if both values
are within their respective upper limits, it can be assumed that there will be no
application size problem.
Furthermore, use the larger of the ADLST and retain data utilization rates as
an indicator of the utilization rate of the control application.

YOKOGAWA STARDOM FCN-RTU Specifications

General

Brand	YOKOGAWA
Model	STARDOM FCN-RTU
Category	Controller
Language	English