CHAPTER 3: SYSTEM INFORMATION
SNAP PAC R-Series Controller User’s Guide
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Most SNAP PAC R-series controllers run PAC Control flowcharts that automatically manipulate the memory
map, so you probably won’t need to understand it in detail. If you do need to refer to it, however, the complete
list of memory map addresses is in the
, (form 1465).
The Control Side of the Controller
The control side of the controller is like a traditional Opto 22 industrial controller. In the control side, the
controller runs PAC Control flowcharts. These flowcharts provide the logic that controls processes through the
system. Commands within the flowchart read from and write to the memory map in the I/O side of the
controller in order to monitor and control the I/O points.
Controlling the System
The flowcharts that run in the control side of the controller are created in PAC Control, a software application
included with the SNAP PAC R-series controller. You create these flowcharts as part of a
control strategy
and
download the strategy to the controller, and the controller runs it independently. For information on using
PAC Control, see the
(form 1700) and the
(form 1701).
You use PAC Control on a PC connected to the network, so you can create your control strategy and download
it to the controller. Also included with the SNAP PAC R-series controller is PAC Display, a full-featured
human-machine interface (HMI). PAC Display uses the same tag database as PAC Control, so points and
variables are already defined. Operators, technicians, and engineers running PAC Display on a Microsoft
Windows-based PC on the Ethernet network can see the information they need, as well as plot trends and
respond to alarms.
For applications that require more than one I/O unit, the SNAP PAC R-series controller can control multiple I/O
units through the flowcharts on its control side. These I/O units can be located where needed on the Ethernet
network for distributed control.
