CHAPTER 3: SYSTEM ARCHITECTURE
SNAP PAC Brains User’s Guide
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SNAP PAC Brain as an Independent I/O Processor
As the following diagram illustrates, you can communicate with an independent SNAP PAC brain
using Modbus/TCP, the OptoOPCServer (available separately), SNMP, SMTP, or applications you
develop using the free OptoMMP Communication Toolkit or our OptoMMP protocol.
Networking
From a physical standpoint, SNAP PAC brains can be networked in several ways:
•
Connected directly to a PC or controller using a standard Ethernet cable
•
Attached to an existing TCP/IP Ethernet network
•
As part of an independent network built with standard Ethernet hardware
The networking method you use depends on several things, including whether you need control or
data acquisition, the number of PCs and I/O units you are using, the speed and volume of
communication, security requirements, and the availability of an Ethernet network.
As an option in any network, you can install multiple brains in a daisy-chain configuration. See
for more information.
Custom application using
ActiveX or C++
Any OPC client software,
through OptoOPCServer
(purchase separately)
Third-party HMI
• Wonderware
• Intellution
• Iconics
Modbus/TCP hardware
and software
OptoMMP protocol
Modbus/TCP
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