Mitsubishi Electric MELSEC iQ-R Series User Manual page 108

About forced offline during emergencies
When the offline relay was switched ON, any unsent messages in the sending queue are discarded.
When there is an emergency offline transition after an offline report message was sent, the format specified "OFFLINE"
function is used.
Ex.
When multiple messages that have accumulated in the sending queue are discarded, an offline report only is sent, and there
is a transition to offline
Setting: Configure the S6F101 format mode to "OFFLINE"
Programmable
controller CPU
MessageÒ transmission request
MessageÓ transmission request
MessageÔ transmission request
S6F101 transmission request
Off-line relay trigger ON
S6F102 receive notification
[Online] relay is OFF
Same sequence applies for disconnection.
In the example above, the S6F101 "Trigger Hold Time" is configured to a value less than the offline "Trigger Hold Time". This
is the setting to send S6F101 first when the S6F101 sending request trigger and offline trigger were switched ON
simultaneously.
S6F101 is not sent until a secondary message of message  is received or a T3 timeout occurs. This function sends offline
reports by priority for queued messages  and .
It does not prioritize and send just by a sending request of S6F101. Switching ON the offline trigger relay prioritizes and sends
S6F101.
Messages and  are discarded. However, the offline spool is configured to enabled, and messages subject to spooling are
spooled.
When message  resulted in a T3 timeout, the operation differs by the retry setting. When the retry function is disabled or
"Retry cancel" has been selected for offline transition, S6F101 is sent immediately. When "Retry priority" has been selected
for offline transition, S6F101 is not sent until the retries are complete.
7 BASIC FUNCTIONS
106
7.7 Option Setting
SECS/GEM communication
software
Primary messageÒ transmission
Secondary messageÒreception
S6F101 transmission
S6F102 reception
Host