Communication Specifications
Original instructions
About us
Introduction
The BMENOC0301/11 Ethernet communications modules provide support for I/O scanning using EtherNet/IP and Modbus TCP.
These specifications describe the I/O communication and the implicit and explicit messaging capacities of the BMENOC0301/11 modules.
NOTE: For throughput considerations, including packets per cycle, refer to the desciption of system throughput considerations Modicon M580 Standalone System Planning Guide for Frequently Used Architectures.
I/O Communication Specifications
These tables present the I/O communications features of the BMENOC0301/11 module.
EtherNet/IP (CIP Implicit Messaging):
Feature
Maximum Capacity
scanner
number of devices
128 (EtherNet/IP devices and local slaves)
message size
input: 505 bytes (excluding header)
output: 509 bytes (excluding header)
adapter
number of instances
16 adapter instances
number of connections
2 connections per instance
message size
511 bytes (including header)
inputs
505 bytes (excluding header)
outputs
509 bytes (excluding header)
Modbus TCP (Modbus I/O Scanner):
Feature
Maximum Capacity
registers
number of devices
128 devices shared with EtherNet/IP
read
125 registers
write
120 registers
message size
read
250 bytes (125 words) (excluding header)
write
240 bytes (120 words) (excluding header)
Combined EtherNet/IP Scanner/Adapter and Modbus Scanner
I/O Data Exchange with the CPU
Feature
Maximum Capacity
Comment
input data size
8 KB, including overhead (4 K words)
8 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 maximum user configurable input data size is approximately 7.55 KB (1 KB = 1,024 Bytes).
output data size
8 KB, including overhead (4 K words)
8 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 maximum user configurable output data size is approximately 7.56 KB (1 KB = 1,024 Bytes).
Explicit Messaging Specifications
These tables present the explicit messaging features of the BMENOC0301/11 module.
NOTE: These tables report the maximum capacity for a single BMENOC0301/11 module. The actual capacity may be reduced based on the selected CPU and the number of modules in your project.j
EtherNet/IP (CIP explicit messaging):
Feature
Maximum Capacity
client
simultaneous requests
16
message size
1024 bytes
server
simultaneous requests
32
message size
1024 bytes
Modbus TCP (Modbus explicit messaging):
Feature
Maximum Capacity
client
simultaneous requests
16
message size
1024 bytes
server
simultaneous requests
64
message size
1024 bytes