2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Using the MSG-SNDE Function with the MP3000 as the Master
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This concludes the setup. Set any other parameters as necessary, then transfer the data to the PLC.
Starting Communications
Use the following procedure to write the data in the hold registers in the MP3000 to the internal relays in
the CPU Unit of the Mitsubishi Q/QnA-series PLC.
1. Start receiving messages on the Mitsubishi Q/QnA-series PLC.
The system will automatically start the message reception operation. No further operation is required.
2. Turn ON the power to the MP3000 to start transmitting messages.
The ladder program example is designed to turn ON the Execute Bit (DB000200) in the message send func-
tion after six seconds has elapsed from when the low-speed scan (or high-speed scan) starts. Thereafter, the
message send function is executed every second by alternating the Execute Bit (DB000200) between OFF
and ON each time the message send function completes execution normally or with an error.
Note: The MP3000 will establish the TCP connection when it starts execution of the MSG-SNDE function.
Set the initial settings and router relay parameters as necessary.
• Initial Settings
These settings apply to the timers when TCP is the selected protocol. In most cases, accept the
default. Set these settings only when necessary, for example, to shorten the time set for the TCP
resend timer.
• Router Relay Parameters
Set these parameters if you are using a subnet mask pattern or default gateway.
SB00003A: Turns ON 5 seconds after start.
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