Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 475

(d) Overhead time when local devices in the interrupt program are enabled
When SM777 (Enable/disable local device in interrupt program) turns on, the time given in the following tables
will be added to the overhead time given in Page 471, Appendix 3.2 (3) (a). 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
CPU module
Q00UCPU, Q01UCPU
Q02UCPU
Q03UD(E)CPU
Q03UDVCPU
Q04UD(E)HCPU, Q06UD(E)HCPU,
Q10UD(E)HCPU, Q13UD(E)HCPU,
Q20UD(E)HCPU, Q26UD(E)HCPU,
Q50UDEHCPU, Q100UDEHCPU
Q04UDVCPU, Q04UDPVCPU,
Q06UDVCPU, Q06UDPVCPU,
Q13UDVCPU, Q13UDPVCPU,
Q26UDVCPU, Q26UDPVCPU
CPU module
Q03UDVCPU, Q04UDVCPU,
Q04UDPVCPU, Q06UDVCPU,
Q06UDPVCPU, Q13UDVCPU,
Q13UDPVCPU, Q26UDVCPU,
Q26UDPVCPU
CPU module
Q02UCPU
Q03UD(E)CPU
Q04UD(E)HCPU, Q06UD(E)HCPU,
Q10UD(E)HCPU, Q13UD(E)HCPU,
Q20UD(E)HCPU, Q26UD(E)HCPU,
Q50UDEHCPU, Q100UDEHCPU
When a local device file in the standard RAM is used
Additional time to the pre-start overhead time
(Page 471,
for interrupt programs
Appendix 3.2 (3) (a))

× ×
(13.2 N1) + (0.22 (N2 + (N3

× ×
(13.2 N1) + (0.22 (N2 + (N3

× ×
(8 N1) + (0.22 (N2 + (N3

× ×
(4.1 N1) + (0.165 (N2 + (N3

× ×
(8 N1) + (0.10 (N2 + (N3

× ×
(4.0 N1) + (0.085 (N2 + (N3
When a local device file in the standard RAM is used
(with an extended SRAM cassette)
Additional time to the pre-start overhead time
(Page 471,
for interrupt programs
Appendix 3.2 (3) (a))

× ×
(4.2 N1) + (0.220 (N2 + (N3
When a local device file in the SRAM card is used
Additional time to the pre-start overhead time
(Page 471,
for interrupt programs
Appendix 3.2 (3) (a))

× ×
(16 N1) + (0.43 (N2 + (N3

× ×
(12 N1) + (0.43 (N2 + (N3

× ×
(12 N1) + (0.40 (N2 + (N3
Additional time to the program-end overhead
time for interrupt programs
Appendix 3.2 (3) (b))
µs ×
16))) + 210 (8 N1) + (0.23
µs ×
16))) + 210 (8 N1) + (0.22
µs ×
16))) + 80 (8 N1) + (0.22
µs ×
16))) + 22.0 (4.1 N1) + (0.165
µs ×
16))) + 80 (8 N1) + (0.10
µs ×
16))) + 22.0 (4.0 N1) + (0.085
Additional time to the program-end overhead
time for interrupt programs
Appendix 3.2 (3) (b))
µs ×
16))) + 22.0 (4.2 N1) + (0.220
Additional time to the program-end overhead
time for interrupt programs
Appendix 3.2 (3) (b))
µs ×
16))) + 260 (16 N1) + (0.43
µs ×
16))) + 100 (12 N1) + (0.43
µs ×
16))) + 100 (12 N1) + (0.40
APPENDICES
(Page 472,

× µs
(N2 + (N3 16))) + 30

× µs
(N2 + (N3 16))) + 30

× µs
(N2 + (N3 16))) + 20

× µs
(N2 + (N3 16))) + 5.7

× µs
(N2 + (N3 16))) + 20

× µs
(N2 + (N3 16))) + 5.7
(Page 472,

× µs
(N2 + (N3 16))) + 5.7
(Page 472,

× µs
(N2 + (N3 16))) + 60

× µs
(N2 + (N3 16))) + 20

× µs
(N2 + (N3 16))) + 20
473
A