- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Introduction / 1-17
• Uses pre-configured web pages for user readings, configuration and maintenance. Web
pages can be modified and new pages configured to work with a modified application
load
• Resides on a BSAP SCADA network
• Provides audit trail and archives
• Allows the user to select engineering units, including English and metric
The primary function of the ControlWave Express is to provide data acquisition, a local
display, communications, output control, input status and self test and diagnostics. Items
below implement and supplement the primary function:
• Data acquisition (see Section 1.5.1)
• Local display (see Section 1.5.2)
• Communications (see Section 1.5.3)
• Control outputs (see Section 1.5.4)
• Status inputs (see Section 1.5.4)
• Self test and diagnostics (see Section 1.5.5)
1.5.1 Data Acquisition
Typical process inputs used by the ControlWave Express are pressure, flow, level,
temperature and frequency input [typically used for positive displacement (PD)], turbine, or
ultrasonic meters. In some cases, inputs may also be derived from external Multivariable
Transmitters using either the BSAP or MODBUS protocols. Alternatively, the inputs may
be obtained via the local I/O Modules using analog transmitters. The ControlWave Express
application program will typically allow any combination of inputs to be selected.
1.5.2 Optional LCD Display
In normal operation, the Display only LCD Display remains ON while the Dual-Button or
25-Button Keypad/Displays turn OFF after the unit has been configured and placed in
service. The operator may activate the Keypad/Display at any time by pressing the
appropriate front panel button (depending on the keyboard type). When activated, the
display scrolls through a list of current values. The list defaults to an appropriate set of
values.
1.5.3 Communications
A ControlWave Express can be configured as a Master or Slave node on either a MODBUS
network or a BSAP network. Up to three serial communication ports are contained on the
ControlWave Express CPU/System Controller Board. Communication ports situated on the
CPU/System Controller Board are designated as follows:
CPU/System Controller Board:
COM1 - Port 1: J4 - 9-Pin Male D-Type Connector - RS-232 (Activated by jumper W18)
J11- 3-Pin Connector – RS-232 (Activated by jumper W18)
COM2 - Port 2: TB3 - 8-Pin Term Block - RS-232 (COM2 supports an External Modem or
Radio option)
COM3 - Port 3: TB4 - 5-Pin Term Block - RS-232/RS-485 (Configuration: RS232/485 via
jumpers W12 through W16 and RS-485 via switch SW3)
Communication Ports COM1, COM2 & COM3 support serial asynchronous operation.
Communication Ports COM1 and COM2 support RS-232 operation while COM3 supports
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