CHAPTER 1: OVERVIEW
SNAP PAC S-Series User’s Guide
9
SNAP-PAC-S2 Connections to Serial-based I/O Units
The following diagram shows a SNAP-PAC-S2 controller connected to multiple Opto 22 serial-based I/O units
over two RS-485 serial networks, a remote a SNAP Ethernet-based I/O unit over a modem using the
Point-to-Point Protocol (PPP), and a serial-based industrial scale.
Sensors and actuators,
location #3
Sensors and actuators,
location #4
Sensors and actuators,
location #5
Sensors and actuators,
location #1
Sensors and actuators,
location #2
PC running PAC
Display Professional
PC running PAC
Control Professional
Scale
RS-485 serial networks
SNAP-PAC-S2 controller controls all
I/O units and processes data from
the scale.
I/O units are connected via a 2-wire RS-485 serial network and are controlled by the SNAP PAC S-series
controller. Each I/O unit is connected to its own group of sensors and actuators.
Ethernet switch
Modem
Modem
PPP connection
PPP connection
to SNAP-PAC-R1
