Mitsubishi Electric MELSEC IQ-R series Reference Manual page 460

■Causes of transmission time (T1) delay
When a command that takes two scans to send is executed, the transmission time is twice the value obtained by the formula
above .
When the access request is issued to the same station from multiple external devices simultaneously, refer to the precautions
for data communication. (Page 23 When accessing CPU module)
Data transmission to the CPU module other than connected station (host station) on MELSECNET/H may be
delayed considerably depending on conditions. The transmission delay time can be shortened by limiting
communication between an external device and the CPU module to the station with C24/E71 mounted, and
communicating with programmable controllers on other stations by data link (LB, LW).
APPENDICES APPENDIX
458
Appendix 2 Processing Time