INTRODUCTION
SNAP PAC S-Series User’s Guide
2
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.
Serial Communication
SNAP PAC S-series controllers provide RS-232 and RS-485 communication as follows:
•
The
SNAP-PAC-S1
,
SNAP-PAC-S1-FM
, and
SNAP-PAC-S1-W
have two RS-232 serial ports that support
general-purpose communication with serial devices; you can send and receive data from one or two
serial devices connected directly to the controller. By default, Port 0 is set to be connected to a modem
using Point-to-Point Protocol (PPP) for creating TCP/IP networks over serial or PSTN (Public Switched
Telephone Network) lines. To connect Port 0 to serial devices, change the port configuration in PAC
Manager.
The S1 PACs also have one pluggable two-wire RS-485 port that can be used for SNAP PAC SB-series serial
brains and legacy Opto 22
mistic
™
I/O units, including the serial B3000 brain and remote
mistic
bricks. The
SNAP-PAC-S1-FM is Factory Mutual approved.
•
The
SNAP-PAC-S2
and
SNAP-PAC-S2-W
have four serial ports that can each be configured using PAC
Manager as either RS-232 or RS-485 (2-wire or 4-wire). These ports can be used for either I/O or
general-purpose serial communication. Configured as RS-232, the ports support remote serial device
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