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Communication Specifications
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Original instructions
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Communication Specifications
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Original instructions
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Communication Type
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Feature
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Capacity
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EtherNet/IP (CIP Implicit Messaging)
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scanner
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maximum number of devices
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128 devices (125 devices as scanner + 3 devices as adapter) shared with Modbus TCP
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maximum message size
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511 bytes
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adapter
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maximum number of instances
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3 adapter instances
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maximum number of connections
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2 connections per instance
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maximum message size
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511 bytes including header
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inputs
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505 bytes excluding header
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outputs
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509 bytes excluding header
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Modbus TCP (Modbus Scanner)
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maximum number of registers
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read
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125 registers
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write
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120 registers
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maximum number of devices
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128 devices shared with EtherNet/IP
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maximum message size
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read
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250 bytes (125 words) excluding header
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write
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240 bytes (120 words) excluding header
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I/O Data Exchange with the CPU
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Feature
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Capacity
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Comments
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maximum total input data size
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4 kb
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4 kb of data includes user configurable data and overhead. The overhead includes module diagnostic data, data object headers, and the number of headers depending on the user configuration. As a result, the user configurable data size is less than 4kb, but more than 3.5 kb.
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maximum total output data size
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4 kb
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4 kb of data includes user configurable data and overhead. The overhead includes module control data, data object headers, and the number of headers depending on the user configuration. As a result, the user configurable data size is less than 4kb, but more than 3.5 kb.
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Communication Type
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Feature
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Capacity
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|---|---|---|---|
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EtherNet/IP (CIP Explicit Messaging)
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client
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maximum number of simultaneous connections
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16 connections
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maximum number of concurrent requests
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16 requests, shared with Modbus TCP
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server
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maximum number of simultaneous connections
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32 connections
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maximum messaging size
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1023 bytes
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Modbus TCP (Modbus Explicit Messaging)
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client
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maximum number of simultaneous connections
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16 connections
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maximum number of concurrent requests
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16 requests, shared with EtherNet/IP
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server
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maximum number of requests that can be transferred to the CPU per scan
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12 connections
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maximum number of simultaneous connections
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32 connections
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maximum message size
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read
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250 bytes (125 words) excluding header
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write
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240 bytes (120 words) excluding header
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