CHAPTER 1: OVERVIEW
SNAP PAC S-Series User’s Guide
3
communication, and any one of the ports can be configured as a PPP modem connection. Configured as
RS-485, the serial ports connect to SNAP PAC serial brains and to
mistic
I/O units.
If you have a substantial number of serial I/O units, the PAC S2 is the controller to use. For the default
configuration settings of these ports, see
“Assigning Serial Ports on SNAP-PAC-S2 Controllers” on page 29
.
For additional serial interfaces, you can add one or more SNAP serial communication modules on attached
SNAP Ethernet-based I/O units.
I/O Unit Compatibility
The combination of Ethernet (both wired and wireless) and serial network interfaces gives SNAP PAC S-series
controllers the ability to control current and many legacy Opto 22 I/O units. All S1s have one RS-485 port, and
S2s can be configured with up to four.
The following table lists I/O units supported by S-series controllers:
This connectivity with legacy serial-based I/O systems, combined with PAC Control Professional software’s
ability to import control programs (or
strategies
) written in OptoControl™ software, provides a migration path
to integrate older Opto 22 I/O systems into modern control hardware running on Ethernet networks.
For detailed information on updating control strategies and integrating legacy control hardware into modern
systems, see the
FactoryFloor to PAC Project Migration Technical Note
(form 1692).
Redundant Controllers
Two identical SNAP PAC S-series controllers can be used in a redundant system, where one controller actively
runs the control program and the other is ready to take over if the first one should fail. Besides two identical
PACs, a redundant system requires PAC Project Professional R9.0 or newer (see
below)
and the SNAP PAC Redundancy Option Kit.
The PAC Control Professional strategy developed for a redundant system makes use of special redundancy
features, such as checkpoint blocks and persistent/redundant variables. The developer has complete flexibility
in programming, tagging specific data for redundancy and placing checkpoint blocks at precise points in the
logic where synchronization is to occur.
See
for a diagram of a redundant system. Also see the
SNAP PAC Redundancy Option Kit Data Sheet
SNAP PAC System Redundancy User’s Guide
(form 1831).
S-Series Controller
On a Wireless LAN
On a Wired Ethernet Network
On a Serial Network
SNAP-PAC-S1
SNAP-PAC-S1-FM
SNAP-PAC-S2
---none---
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-EB1
SNAP-PAC-EB1-FM
SNAP-PAC-EB2
SNAP-PAC-EB2-FM
SNAP-UP1-ADS**
SNAP-B3000-ENET**
SNAP-ENET-D64**
SNAP-ENET-S64**
SNAP-ENET-RTC**
SNAP-PAC-SB1*
SNAP-PAC-SB2*
B3000**
B3000-B**
SNAP-BRS**
B100**
B200**
G4D16R**
G4D32RS**
G4A8R**
SNAP-PAC-S1-W
SNAP-PAC-S2-W
SNAP-PAC-R1-W
SNAP-PAC-R2-W
SNAP-PAC-EB1-W
SNAP-PAC-EB2-W
* For information about data transfer speed when using a controller to communicate with a serial brain, see
** Legacy I/O processors; not recommended for new development
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