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MELSEC-Q
8 DATA COMMUNICATION USING THE PRE-DEFINED PROTOCOL
For details, refer to the following manual.
Operating Manual (Pre-defined protocol support function)
POINT
A protocol used in the pre-defined protocol function is a means for communicating
with an external device.
It comprises of the following information:
• Packet element (packet format)
• Packet data
• Communication type (Send only, Receive only, or Send and receive)
(2) Numbers of protocols and packets that can be registered
The following are the maximum numbers of protocols and packets that can be
registered.
• Protocols: Up to 128
• Packets: Up to 256
Once a protocol is registered, a packet determined for each protocol is registered
to the packet data area.
Because of this, the available number of protocols is 127 or less when:
1) The number of registered packets reached the maximum (256).
2) The usage rate of the packet data area reached 100%.
The usage rate of the packet data area can be confirmed in GX Configurator-SC
(Pre-defined protocol support function).
Note that the usage rate of the packet data area varies by protocol.
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