- Emerson Remote Terminal Unit Instruction Manual

2-18 / Installation & Operation CI-ControlWave Express
2.3.4.4 Dedicated Non-isolated Digital Outputs
Process I/O Board Terminal Block connector TB3 provides interface to 2 dedicated non-
isolated Digital Outputs (DOs) and two selectable DI/Os. Digital Outputs have a 30V
operating range and are driven by Open Drain MOSFETs that provide 400 mA (Max.) at
30Vdc. The maximum output frequency is 20 Hz. Transorbs (30Vdc) provide surge
suppression between each signal and ground.
2.3.4.4.1 Dedicated Digital Output Configurations
Process I/O Board Terminal Block connector TB3 supports two non-configurable externally
powered DOs. Open drain MOSFETs associated with each DO can sink 400mA. Field
wiring assignments are provided in Figure 2-9.
2.3.4.5 Selectable Non-isolated Digital Inputs/Outputs
TB3 supports 2 user-selectable Digital Inputs/Outputs. These DI/Os may be unused or
individually user wired as desired, i.e., both DI, both DO, one DI and/or one DO. Their
operation depends on how they are wired, i.e., DI or DO. DI/Os are rated identically to the
DIs and DOs.
2.3.4.5.1 Selectable Digital Input/Output Configurations
Process I/O Board Terminal Block connector TB3 supports two user selectable DI/DOs.
When wired for DI operation, each DI provides a 200uA or 2.2mA source current from
3.3Vdc. Switch SW1-3 must be set to establish the DI source current for DI 5 & 6 (SW1-3
ON = 2.2mA, OFF = 200uA). When wired for DO operation, the Open Drain MOSFET
associated with each DO can sink 400mA @ 30Vdc. Field wiring assignments are provided
in Figure 2-9.
2.3.4.6 Non-isolated Analog Inputs
Process I/O Board Terminal Block connector TB6 provides interface to three single-ended
Analog Inputs. Three field terminals are assigned for each Analog Input, i.e., Field Power,
AI# and DGND). AI field power applied to each Analog Input (controlled via Jumper JP4)
can be supplied by the system power (bulk input supply) or an external 24V power source.
Each AI can be individually configured for 4-20mA or 1-5 operation (via Jumpers JP5 for
AI1, JP6 for AI2 and JP7 for AI3). Note: When AI Field Power Jumper JP4 is set in
position 1 to 2, an external 24Vdc power source such as the ControlWave Loop
Power Supply (see PIP-ControlWaveLS) will be required to power the Analog
Inputs. When JP4 is set in position 2 to 3, the three Analog Inputs are powered by
the system, i.e., the bulk input power applied to across TB1-3 (Power In+) and
TB1-4 (GND) on the CPU/System Controller Board.
AIs are supplied with a two hertz low pass filter and surge suppression (via 30Vdc Tran-
sorbs). The Analog Inputs are self-calibrating.
2.3.4.6.1 Analog Input Configurations
AI circuits are supported by Configuration Jumpers that accommodate configuration of
each of the three Analog Inputs (see Table 2-7). Analog Input can be individually configured
for 1-5V or 4-20mA operation. Field wiring assignments are provided in Figure 2-9.
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