Mitsubishi Electric MELSEC iQ-R Series User Manual page 91

PLC Response Monitoring Timer and Secondary Monitoring Timer
■Handshake for each transaction
The PLC Response Monitoring Timer monitors the time from "(2) Reception notification trigger relay ON" to "(6) Sending
request detection". The Secondary Monitoring Timer is not used for a handshake for each transaction.
Programmable
controller CPU
(3) Receive
notification
detection
(4) Reception
processing
(5) Transmission
request
relay off
■Handshake for each message
The PLC Response Monitoring Timer monitors the time from "(2) Reception notification trigger relay ON" to "(4) Reception
notification trigger relay OFF". Furthermore, the Secondary Monitoring Timer monitors the time from "(2) Reception
notification trigger relay ON" to "(6) Sending request trigger relay ON".
Programmable
controller CPU
(3) Receive
notification
detection
(4) Receive notification
relay off
(5) Reception
processing
(6) Transmission
request
relay on
Shared memory/
Device
(2) Receive notification
relay on
Shared memory/
Device
(2) Receive notification
relay on
(8) Transmission request
relay off
SECS/GEM communication
software
(1) Primary message
(6) Transmission request
detection
(7) Secondary message
SECS/GEM communication
software
(1) Primary message
(7) Transmission request
detection
(9) Secondary message
7 BASIC FUNCTIONS
Host
7
Host
89
7.7 Option Setting