Communications Using The Predefined Protocol; Setting Protocols; Writing Protocols; Applicable Connections - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

1.3

Communications Using the Predefined Protocol

Data can be exchanged between the external device (such as measuring instrument and bar code reader) and the CPU
module following the protocol of the device.
Data that varies according to communication session can be handled by incorporating a device or buffer memory into the
communication packet.
Sets the protocol required for communication with the external device using the engineering tool.
The protocol can be set by selecting from the predefined protocol library, or it can be created and edited.
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Setting protocols

Protocols can be set easily using the predefined
protocol support function of GX Works3.
GX Works3
External device
The number of protocols and packets that can be registered is as follow.
• Protocols: 128 maximum
• Packets: 256 maximum
• Packet data area size: 12288 bytes maximum
When the number of packets reaches the upper limit, protocols cannot be added even if the number of
protocols has not reached the upper limit. If the packet data area size reaches the upper limit, protocols and
packets cannot be added even if the number of protocols and packets has not reached the upper limit.

Applicable connections

The connections No.1 to 16 of the P1 connector can be used for the communications using the predefined protocol.
Communications using the predefined protocol cannot be used with the P2 connector.
1 FUNCTIONS
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1.3 Communications Using the Predefined Protocol
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Writing protocols

Write the set protocols in the Ethernet-equipped module.
Ethernet-equipped module
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Executing protocols
Execute protocols by dedicated instructions.
Multiple protocols can be executed by one dedicated instruction.
Sending
External device
Receiving
Data can be communicated
with protocols appropriate
to each external device.