Communication Specifications
Original instructions
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Introduction
The following specifications describe both the I/O communication and the explicit messaging capacities of the BMX NOC 0401.
I/O Communication Specifications
The Ethernet communication module presents the following I/O communication features:
Communication type
Feature
Capacity
EtherNet/IP (CIP Implicit Messaging)
Scanner
  Maximum number of devices
128 devices (125 devices as scanner + 3 devices as adapter) shared with Modbus TCP
  Maximum message size
512 bytes
Adapter
  Maximum number of instances
3 adapter instances
  Maximum number of connections
2 connections per instance
  Maximum message size
511 bytes including header
    Inputs
505 bytes excluding header
    Outputs
509 bytes excluding header
Modbus TCP (Modbus Scanner)
Maximum number of registers
  Read
125 registers
  Write
120 registers
Maximum number of devices
128 devices shared with EtherNet/IP
Maximum message size
  Read
250 bytes (125 words) excluding header
  Write
240 bytes (120 words) excluding header
Explicit Messaging Specifications
The Ethernet communication module presents the following explicit messaging features:
Communication type
Feature
Capacity
EtherNet/IP (CIP Explicit Messaging)
Client
  Maximum number of simultaneous connections
16 connections
  Maximum number of concurrent requests
16 requests, shared with Modbus TCP
Server
  Maximum number of simultaneous connections
32 connections
  Maximum messaging size
1023 bytes
Modbus TCP (Modbus Scanner)
Client
  Maximum number of simultaneous connections
16 connections
  Maximum number of concurrent requests
16 requests, shared with EtherNet/IP
Server
  Maximum number of simultaneous requests
128 requests
  Maximum number of simultaneous connections
32 connections
Maximum message size
  Read
250 bytes (125 words) excluding header
  Write
240 bytes (120 words) excluding header