INTRODUCTION
SNAP PAC S-Series User’s Guide
2
These independent Ethernet ports have separate IP addresses that can be used with PAC Project
™
Professional software to set up redundant network links to safeguard the availability and reliability of
an I/O system, or to segment a control system’s network from the enterprise LAN.
Supported protocols over Ethernet include EtherNet/IP
™
, Modbus
®
/TCP, SMTP, SNMP, FTP, and
OptoMMP.
•
Using EtherNet/IP, SNAP PAC S-series controllers can share data with Allen-Bradley
®
Logix PLCs
and other PLC systems based on the EtherNet/IP protocol.
•
Using Modbus/TCP, S-series PACs can share data with Ethernet-based Modbus hardware and
software.
•
SMTP (Simple Mail Transfer Protocol) is used for email, and SNMP (Simple Network
Management Protocol) lets the network monitor the PAC just as it would monitor network
computer hardware.
•
FTP can be used to manipulate files and data in the PAC’s file system.
•
OptoMMP is an open, documented protocol used by all Opto 22 Ethernet-based controllers and
brains.
Wired+Wireless
™
Communication
SNAP-PAC-S1-W
and
SNAP-PAC-S2-W
controllers add wireless capability to communications. In
addition to the two wired network interfaces, these models have a wireless network interface as
well, so each PAC has a total of three separate IP addresses—two wired and one wireless.
Wired+Wireless PACs can be used wirelessly or on a wired network, or both at once.
For flexibility in designing your wireless network, wireless communication
includes support for 802.11a, b, and g standards. Wired+Wireless PACs can be
used with a variety of wireless switches and other infrastructure hardware. For the
best security, the 802.11i WPA2/AES standard is supported, while older WPA and
WEP security standards are included for backwards compatibility.
Just like a laptop computer with a wireless connection, all functionality
remains the same whether the Wired+Wireless PAC is used
wirelessly or as part of a wired network. Supported protocols
remain the same. Control programs run the same on both
networks without reprogramming.
A Wired+Wireless S-series PAC can communicate with both wired
and wireless SNAP PAC I/O units. (See “I/O Units Supported” on
page 3 for details.) If desired, the PAC can segment a wireless
network from a wired one.
