Periodic Message Transmission To The Host; How To Link With Devices - Mitsubishi Electric MELSEC iQ-R Series User Manual

C controller/c intelligent function module secs/gem communication software pre-installed model
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Periodic message transmission to the host

Message transmission from the Programmable Controller CPU to the host at fixed intervals does not involve trigger
handshake.
The following shows the flow:
1.
The programmable controller CPU turns ON the sending request trigger relay of a message for which periodic sending is
configured after sending data is stored in the shared memory/device of the programmable controller CPU.
2.
The SECS/GEM communication software sends periodic messages to the host while an ON status of the sending
request trigger relay configured for periodic sending is detected.
If the transmission data is updated by the Programmable Controller CPU during periodic message transmission, subsequently
the updated data will be transmitted.
3.
The programmable controller CPU turns OFF the sending request trigger relay configured for periodic sending to end the
cyclic message sending.
Precautions
When a secondary message was received, turn OFF the reception notification trigger relay.
Otherwise, it causes the reception queue to become full.

How to link with devices

When defining message information and item information, it is possible to use a device as a control register.
It is necessary to configure the device information in advance to link the SECS/GEM communication software pre-installed
model module, programmable controller CPU, and I/O unit.
For the configuration procedure, refer to the following:
Page 78 Device Assignment
7 BASIC FUNCTIONS
58
7.3 Programmable Controller CPU Link Function

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