2.6 Communications with a Mitsubishi PLC (A-compatible 1E Frame protocol)
Using Automatic Reception with the MP3000 as a Slave
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6. Create a ladder program for communications.
Use the OPEN instruction to establish a connection with the remote device.
Use the BUFSND instruction to write the contents of the registers specified by the parameters listed
below to the MP3000 hold registers (M registers).
If necessary, add close processing by programming a CLOSE or similar instruction.
Note: Contact Mitsubishi Electric Corporation for further information on ladder programming.
This concludes the setup. Set any other parameters as necessary, then transfer the data to the PLC.
Starting Communications
1. Turn ON the power to the MP3000 to start receiving messages.
The system will automatically start the message reception operation. No further operation is required.
2. Use an OPEN instruction in the MELSEC Q/A-series PLC to establish a connection with the
MP3000, then use a BUFSND instruction to send messages.
When the Mitsubishi Q/A-series PLC starts sending messages, communications with the MP3000 will start.
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.
In this example, the start address of the device containing the data to send using the
BUFSND instruction is set to D00200.
D00200 (send data length):100 words
D00201 to D00300 (send data): Data to be written into MW00000 to MW00099
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