Hardware reference guide

Network Configurations
35013379 02 October 2007 47
Quantum Network Interface Techniques
Overview Quantum communication and networking modules use a variety of different
techniques to interface to the Quantum controller over the local backplane.
Direct CPU
Driver
This technique allows the CPU to control high speed data transfers to and from the
communication and networking modules, maximizing throughput and performance.
This technique is used extensively by the Remote I/O network and Hot Standby
system to ensure highly deterministic synchronization of the CPU and I/O scans.
Option Module
Interface
This technique allows the communication and networking modules to control data
transfers to and from the CPU, maximizing the flexibility of the communications
interface.
This technique is used extensively by the Modbus Plus and Ethernet peer-to-peer
network modules. The number of option module interfaces supported by each CPU
model is described in the following table.
CPU Interface
Support
The following table shows the summary of Quantum CPU option module interface
support in standalone configurations.
Note: Only one Remote I/O Head Interface is supported for each Quantum CPU.
Quantum Controller Model Number Available Option Module Interfaces
Supported Per CPU
140CPU53414(A) 6
140CPU53414(B) 6
140CPU43412(A) 6
140CPU42402 6
140CPU21304 2
140CPU11303 2
140CPU11302 2
Note: Refer to Quantum Modbus and Modbus Plus Communications, p. 50 for
details of available services on 140NOM2XX00 Modbus Plus Network modules.
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com