- Emerson Remote Terminal Unit Instruction Manual

1-16 / Introduction CI-ControlWave Express
power is applied to the field device (controlled via jumper JP4) and can be supplied by the
system battery or an external power source. Each AI channel can be individually configured
for 4 to 20mA or 1-5V operation (via JP5 for AI1, JP6 for AI2 and JP7 for AI3).
AIs are supplied with a two hertz low pass filter and surge suppression (via 30Vdc
Transorbs).
1.3.3.3.5 Non-isolated Analog Output (also see Section 2.3.4.7)
Terminal Block TB7 provides interface to 1 Analog Output. The AO channel can be
configured for an internal or external power source via jumper JP3. External power can
range from +11 to + 30 Vdc.
Analog Output circuitry consists of a 12-bit resolution Digital to Analog Converter, a V to I
circuit and a V to V circuit. 4 to 20mA or 1-5V operation is jumper configured via JP1. An
ultra low power 16-bit RISC Microcontroller (MSP) reads the state of SW1-4 and selects the
appropriate calibration data for the AO channel.
1.3.3.3.6 Non-isolated High Speed Counter Inputs (also see Sections 2.3.4.8)
Terminal Block TB4 provides the interface to two internally-sourced single-ended High
Speed Counter or Digital Inputs (HSCI) with selectable high (10 kHz)/ or low (300 Hz)
frequencies (SW1-1 for HSC1 & SW1-2 for HSC2). All Input circuits have surge suppression
and signal conditioning. HSCs can be interfaced via Dry Contacts or Open Collector field
circuits. Note: High Speed Counter Inputs can also be configured for DI operation
via ControlWave Designer.
High Speed Counter/Digital inputs are sourced from 3.3Vdc and are switch selectable for a
source current of 200uA or 2.2mA (SW1-3 ON = 2.2mA, OFF = 200uA). Note: SW1-3 sets all
DIs and all HSCs. Each HSC circuit has a maximum input frequency of 10 kHz.
1.4 FIELD WIRING
ControlWave Express remote terminal units support connection to external field devices
through field wiring terminals on the CPU/System Controller Board and the Process I/O
Board. Connections to the following types of external devices may be made:
• RTD (CPU Bd.) • Pulse Inputs* (CPU Bd.)
• Analog Inputs (AIs) (I/O Bd.) • Analog Outputs (AOs) (I/O Bd.)
• Digital Inputs (DIs) (I/O Bd.) • Battery/Power Supply/Solar Panel (CPU Bd.)
• Digital Outputs (DOs) (I/O Bd.) • Communications (RS-232 and RS-485) (CPU Bd.)
• Relays (HSCs*) (I/O Bd.)
* Pulse Inputs and HSC Inputs can also be configured for use as Digital Inputs.
1.5 FUNCTIONS
ControlWave Express RTUs are shipped without a base application program. Using
ControlWave Designer, the user can readily modify this application and then add or
subtract functions, etc. An overview of a typical application is provided below.
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