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CHAPTER10 CPU MODULE PROCESSING TIME
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10.1 Scan Time
10.1.3 Factors that increase the scan time
(a) When local devices in a subroutine program are enabled
When SM776 (Enable/disable local device at CALL) is turned on, the processing time shown in Table10.18 or
Table10.19 is required for each subroutine call.
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
Table10.18 Processing time (when a local device file in the standard RAM is used)
CPU module
Processing time when a
subroutine program in the same
file is called
Processing time when a subroutine program
in a different file is called
Q00UCPU, Q01UCPU
0.00 s (24 N1) + (0.73 (N2 + (N3 16))) + 280 s
Q02UCPU
0.00 s (24 N1) + (0.44 (N2 + (N3 16))) + 280 s
Q03UDCPU, Q03UDECPU
0.00 s (16 N1) + (0.44 (N2 + (N3 6))) + 100 s
Q04UDHCPU, Q06UDHCPU,
Q10UDHCPU, Q13UDHCPU,
Q20UDHCPU, Q26UDHCPU,
Q04UDEHCPU, Q06UDEHCPU,
Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU
0.00 s (16 N1) + (0.20 (N2 + (N3 16))) + 100 s
Table10.19 Processing time (when a local device file in a SRAM card is used)
CPU module
Processing time when a
subroutine program in the same
file is called
Processing time when a subroutine program
in a different file is called
Q02UCPU
0.00 s (32 N1) + (0.86 (N2 + (N3 16))) + 320 s
Q03UDCPU, Q03UDECPU
0.00 s (24 N1) + (0.86 (N2 + (N3 16))) + 120 s
Q04UDHCPU, Q06UDHCPU,
Q10UDHCPU, Q13UDHCPU,
Q20UDHCPU, Q26UDHCPU,
Q04UDEHCPU, Q06UDEHCPU,
Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU
0.00 s (24 N1) + (0.80 (N2 + (N3 16))) + 120 s