CHAPTER 3: SYSTEM ARCHITECTURE
SNAP PAC Brains User’s Guide
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Choosing Communication Methods
How do you need to communicate with SNAP PAC brains to match the tasks your application
requires? Check the following table for help in choosing communication methods and finding out
where to look for more information on them.
This task
Can be done using these methods
Comments and references
Recommended
Alternate
Configure I/O units.
PAC Control (I/O
points only) or PAC
Manager (I/O points
and other functions)
OptoMMP Commu-
nication Toolkit or
OptoMMP protocol
If you are using PAC Control, configure the system in
PAC Control. See the
PAC Control User’s Guide
.
For the Communication Toolkit or OptoMMP protocol,
see
OptoMMP Protocol Guide
.
Monitor and control pro-
cesses; acquire data.
PAC Control flow-
chart logic
PAC Manager
Inspect window or
OptoMMP Commu-
nication Toolkit or
OptoMMP protocol
See
PAC Control User’s Guide
&
Command Reference
.
CAUTION! Events and reactions set up using alternate
methods are faster than flowchart logic, but be careful if
you use them. They can conflict with PAC Control logic,
because both write to the brain’s memory map. For Com-
munication Toolkit or OptoMMP protocol, see
OptoMMP
Protocol Guide
.
Give technicians an Opto 22
HMI with alarming and trend-
ing.
PAC Display
See
PAC Display User’s Guide.
Communicate with Mod-
bus/TCP hardware or soft-
ware.
Modbus/TCP
See
Modbus/TCP Protocol Guide
.
Exchange I/O point data with
third-party software such as
HMIs and databases.
OptoOPCServer for
OPC; OptoDataLink
for databases
Purchase OptoOPCServer or OptoDataLink separately
or as part of PAC Project Professional. See
OptoOPC-
Server User’s Guide
and
OptoDataLink User’s Guide
.
Send email or page someone.
Send SNMP trap.
Monitor devices through an
enterprise management sys-
tem.
PAC Control (and
PAC Manager for
configuration)
OptoMMP Commu-
nication Toolkit or
OptoMMP protocol
If you are using PAC Control, configure email using PAC
Manager. See the
PAC Manager User’s Guide
.
For Communication Toolkit or OptoMMP, see
OptoMMP
Protocol Guide
.
Write your own software
application to communicate
with the system.
C++ or Active X:
OptoMMP Communi-
cation Toolkit and
brain’s memory map.
Opto 22’s OptoMMP
protocol and brain’s
memory map.
See
OptoMMP Protocol Guide.
