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CHAPTER10 CPU MODULE PROCESSING TIME
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10.1 Scan Time
10.1.2 Time required for each processing included in scan time
1) Overhead time when local devices in the interrupt program are enabled
When SM777 (Enable/disable local device in interrupt program) is turned on, the time given in Table10.6 and
Table10.7 will be added to the overhead time given in Table10.3 and Table10.4.
Each n, N1, N2, and N3 in the table indicates the following:
• n: Number of local device points (unit: K words)
• N1: Number of devices that specified a local device
• N2: Number of word device points that specified a local device
•
N3: Number of bit device points that specified a local device
Table10.6 When a local device file in the standard RAM is used
CPU module
Additional time to the pre-start overhead time
for interrupt programs
(Table10.3)
Additional time to the program-end overhead
time for interrupt programs
(Table10.4)
Q00UCPU, Q01UCPU
(13.2 N1) + (0.22 (N2 + (N3 16))) + 210 s (8 N1) + (0.23 (N2 + (N3 16))) + 30 s
Q02UCPU
(13.2 N1) + (0.22 (N2 + (N3 16))) + 210 s (8 N1) + (0.22 (N2 + (N3 16))) + 30 s
Q03UDCPU, Q03UDECPU
(8 N1) + (0.22 (N2 + (N3 16))) + 80 s (8 N1) + (0.22 (N2 + (N3 16))) + 20 s
Q04UDHCPU, Q06UDHCPU,
Q10UDHCPU, Q13UDHCPU,
Q20UDHCPU, Q26UDHCPU,
Q04UDEHCPU, Q06UDEHCPU,
Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU
(8 N1) + (0.10 (N2 + (N3 16))) + 80 s (8 N1) + (0.10 (N2 + (N3 16))) + 20 s
Table10.7 When a local device file in a SRAM card is used
CPU module
Additional time to the pre-start overhead time
for interrupt programs
(Table 10.3)
Additional time to the program-end overhead
time for interrupt programs
(Table 10.4)
Q02UCPU
(16 N1) + (0.43 (N2 + (N3 16))) + 260 s (16 N1) + (0.43 (N2 + (N3 16))) + 60 s
Q03UDCPU, Q03UDECPU
(12 N1) + (0.43 (N2 + (N3 16))) + 100 s (12 N1) + (0.43 (N2 + (N3 16))) + 20 s
Q04UDHCPU, Q06UDHCPU,
Q10UDHCPU, Q13UDHCPU,
Q20UDHCPU, Q26UDHCPU,
Q04UDEHCPU, Q06UDEHCPU,
Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU
(12 N1) + (0.40 (N2 + (N3 16))) + 100 s (12 N1) + (0.40 (N2 + (N3 16))) + 20 s