OPTO 22 SNAP PAC R SERIES, Руководство пользователя

Страница: 19 / 82

CHAPTER 2: INSTALLATION
SNAP PAC R-Series Controller User’s Guide 11
Choose your configuration tool based on what you need to do:
Whichever tool you use for configuring I/O, be aware of the impact if you later change configuration. For
example, if you configure I/O in PAC Manager, download the configuration file to I/O units, and then later add
a point in PAC Control, remember that your configuration file doesn’t contain that point.
USING PPP OVER A MODEM
Use the rest of this chapter only if you have SNAP PAC R-series controllers installed at remote locations or in
other places where an Ethernet network is not available, and you are using modems to communicate
between the controller and a PC. The modems use the point-to-point protocol (PPP) to communicate. You
can set up communication so that the controller can dial in to a PC, so that PCs can dial into the controller, or
both.
NOTE: You can communicate with a SNAP PAC R-series controller using a modem and PPP at the same time you are
communicating with the controller over an Ethernet network.
Here’s how to set up PPP:
1. Use PAC Manager to assign an IP address to the SNAP PAC R-series controller, following the instructions in
the
PAC Manager User’s Guide.
2. Follow steps in the next section to configure PPP.
3. Attach the modem to the system, following the steps below.
4. Set up Windows dial-up networking on the PC.
Use PAC Control for I/O configuration if… Use PAC Manager for I/O configuration if…
• You have only one I/O unit or I/O unit configurations are
different.
• The strategy will run on I/O units that are controlling
themselves using the loopback IP address (127.0.0.1).
• You are using a wired Ethernet network for communications.
• The strategy handles all logic; you are not also configuring
events and reactions on I/O units.
• You have multiple I/O units whose configurations are exactly
the same or similar.
• You are using a wireless LAN, a modem connection (PPP), or
SNMP.
• You are using event messages or email.
• You are configuring events and reactions on the I/O unit in
addition to strategy logic.
• You are using OPC to communicate with I/O units.
• You are not using PAC Control.
PC dials in to
controller
SNAP PAC R-series
controller
Modem
Modem
PC with dial-up
networking
Modem