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MELSEC-
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7 USING FRAMES WHEN EXCHANGING DATA
7.4.2 Devices and statuses that can be designated
The devices and statuses that can be monitored by the R2 to detect the timing for
transmitting the data (hereinafter transmission trigger) at the device and status change
are described below.
The targets of the transmission trigger that can designate transmission at the change
of the device or status are shown.
(1) Transmission trigger by monitoring RX/RY/RW
The R2 monitors the following user-designated data in the master module on the
CC-Link, and starts the data transmission process when the user-designated
transmission conditions are established.
1) When RX, RY changes (rising edge/falling edge).
2) When the RW value changes from 0 to a value other than 0.
(2) Transmission trigger by monitoring status
The R2 monitors the following status in the master module on the CC-Link or the
programmable controller CPU mounted on the master module, and starts the
data transmission process when the user-designated transmission conditions are
established.
1) When the CC-Link data link status (linked, stopped) changes.
2) When the programmable controller CPU operation status
(running/stopped) changes.
3) When the programmable controller CPU status (normal/error) changes.
(R2 makes a judgment with the normal/error access from the R2 to the
programmable controller CPU.)