Time Required For Each Processing Included In Scan Time - Mitsubishi Electric melsec q00ujcpu User Manual

(1) How to check scan time
The CPU module measures current, minimum, and maximum values of the scan time.
The scan time can be checked by monitoring the special register (SD520, SD521, and SD524 to SD527).
Accuracy of each stored scan time is
Current value
Minimum value
Maximum value
If the stored values in SD520 and SD521 are 3 and 400 respectively, the scan time is 3.4ms.
Example
10.1.2

Time required for each processing included in scan time

This section describes how to calculate the processing and execution time described in Section 10.1.1.
(1)
I/O refresh time
The I/O refresh time is time required for refreshing I/O data to/from the following modules mounted on
the main base unit and extension base units.
• Input module
• Output module
• Intelligent function module
Calculation method
Use the following expression to calculate the I/O refresh time.
(I/O refresh time) = (number of input points/16)
For N1 and N2, refer to
CPU module
Q00UJCPU, Q00UCPU, Q01UCPU
Q02UCPU
Q03UDCPU, Q04UDHCPU,
Q06UDHCPU, Q10UDHCPU,
Q13UDHCPU, Q20UDHCPU,
Q26UDHCPU, Q03UDECPU,
Q04UDEHCPU, Q06UDEHCPU,
Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU
10 - 2
0.1ms.
SD520 SD521
SD524 SD525
SD526 SD527
Figure 10.2 Scan time storage location
Table10.1.
Table10.1 I/O refresh time
Q3 B, Q3 SB, Q3
N1
1.8 s
1.5 s
1.5 s
Stores the scan time of 1ms or less (unit: s).
Stores the scan time. (unit: ms).
N1 + (number of output points/16)
RB, Q3 DB
N2
1.0 s
1.1 s
1.0 s
N2
Q5 B, Q6 B, Q6 RB
N1 N2
2.6 s 1.9 s
2.4 s 1.9 s
2.3 s 1.8 s