Emerson Process Management Bristol ControlWave PAC - Manual (Page 2)

CWPAC October 2012
2 www.EmersonProcess.com/Remote
Communications
The ControlWave PAC supports up to seven communication
ports. The base CPU module has two RS-232 serial ports and
one Ethernet port. Two additional RS-232 or RS-485 serial
ports and two additional Ethernet ports are optional.
Communication Protocols
ControlWave PAC supports BSAP (Bristol Standard
Asynchronous Protocol), Modbus, DF1, CIP, DNP3, and serial
ASCII communication protocols as standard features.
ControlWave PAC also supports the following Modbus
protocols:
 Modbus serial and TCP/IP Open Modbus (Ethernet)
 Master and Slave
 Modbus RTU and ASCII
 Function Codes 1–7, 8, 15, and 16
 Integer and IEEE 4-byte floating point
Inputs and Outputs
Input and output (I/O) modules are designed to maximize
usability while minimizing installation, maintenance, and
system down-time costs. A pull-down door provides front
panel wiring terminal access for technicians. The bezel and
the terminations can be easily removed from the I/O
module to make wiring even easier. In addition, a wide
range of applications is supported by the availability of both
local terminations and remote DIN-rail terminations.
To minimize field wiring and eliminate the need for
marshalling strips, the analog input (AI) and discrete input
(DI) modules are capable of supplying loop power to two-
wire transmitters and dry contacts.
Status indicators offer instant visual notification of I/O
conditions. Each I/O module has a two-color Pass/Fail LED
that displays the online diagnostic status. Discrete I/O
modules provide status LEDs for each point on the module.
AI modules provide two LEDs on each input point to indicate
input under/over range conditions.
The ControlWave PAC supports a wide variety of I/O
modules. Available I/O modules include:
 Analog Input (AI) module with 8 or 16 points
 Analog Output (AO) module with 8 points
 Discrete Input (DI) module with 16 or 32 points
 Discrete Output (DO) module with 16 or 32 points
 Resistance Temperature Detector (RTD) module with 4
points
 Thermocouple (TC) module with 6 points
 UDI Counter module with 6 points
Note: Modules are hot-swappable. All I/O is frozen for 300
milliseconds when any module is replaced.
Remote Termination Modules
The remote termination option for the ControlWave PAC
modules provides a convenient alternative to the standard
direct connect termination. All remote termination modules
are standard DIN-rail mountable, and connect to the I/O
module with pre-wired connector cables. To simplify
installation, all I/O modules use the same cable.
I/O Expansion Rack
The I/O Expansion Rack allows for the addition of I/O
modules to multiple local and remote mounted racks. The
I/O Expansion Rack consists of a 4- or 8-slot ControlWave
chassis. This chassis contains an Ethernet communication
engine dedicated to communications between the main
processor and the I/O Expansion Rack. The communication
engine also supports battery backed RAM to retain output
values during short power outages.
The I/O Expansion Rack is connected to the main
ControlWave via an Ethernet physical link using TCP/IP. The
process control application program resides in the main
ControlWave. The main ControlWave controls both local I/O
as well as the I/O located in the I/O Expansion Rack.
ControlWave Redundant Systems
Redundant systems are ideal for use in critical processes and
harsh applications that require maximum operational
readiness and system availability. The ControlWave PAC
redundant systems are designed to prevent a single point of
failure from shutting down the entire system. Two types of
redundant systems are available for the ControlWave PAC:
the redundant process control and communications system,
and the redundant input/output (I/O) system. For more
information on the ControlWave PAC redundant systems,
refer to Product Data Sheet CWPAC:RDN.
Key Switch
The ControlWave PAC is available with a three-position front
panel key switch. The front panel key switch provides a high
level of manual security by controlling three modes of
operation.
In Run Mode, the ControlWave PAC rejects any attempt to
download or modify the running program, either locally or
over the network.
In Remote Mode, the ControlWave PAC allows downloading
and online program modification through the network
provided the security access requirements have been met.
Local download and online modification of the running
program is prohibited.
In Local Mode, the ControlWave PAC allows download and
online modification through either the network connection
or through a local serial communication port provided the
security access requirements have been met.