- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Introduction / 1-15
1.3.3.2 Process I/O Board Connectors
Process I/O Boards are equipped with up to six (6) I/O interface connectors that function as
follows (see Table 1-5):
Table 1-5 - Process I/O Board Connector Summary
Ref. # Pins Function Notes
P1 20-Pin Bd. Power and I/O Bus Intf. to CPU/System Controller Bd.
TB2 6-Pin Digital Input (DI1 – DI4) Interface see Section1.3.3.3.1
TB3 8-pin Digital Output (DO1 & DO2) & DI/O
(DI5/DO3 & DI6/DO4) Interface
see Section 1.3.3.3.2 for DO
see Section 1.3.3.3.3 for DI/O
TB4 8-pin High Speed Counter Input Interface see Section 1.3.3.3.6
TB6 9-pin Analog Input Interface see Section 1.3.3.3.4
TB7 4-pin Analog Output Interface see Section 1.3.3.3.5
1.3.3.3 Process I/O Board Field I/Os
Field I/O Wiring is supported by card edge Terminal Block Connectors as follows:
Non-isolated Digital Input (DI) Connector (Section 1.3.3.3.1)
Non-isolated Digital Output (DO) & Digital I/O Connector (Sections 1.3.3.3.2 & 1.3.3.3.3)
Non-isolated Analog Input Connector (Section 1.3.3.3.4)
Non-isolated Analog Output Connector (Section 1.3.3.3.5)
Non-isolated High Speed Counter Input Connector (Section 1.3.3.3.6)
1.3.3.3.1 Dedicated Non-isolated Digital Inputs (also see Section 2.3.4.3)
Terminal Block TB2 provides interface to 4 dedicated non isolated Digital Inputs DIs). All
Digital Inputs support dry contact inputs that are pulled internally to 3.3 Vdc when the
field input is open. Source current for DI#1 through DI#4 is switch selectable for 60uA or
2mA from the 3.3V supply (SW1-3 ON = 2mA, OFF = 60uA). Note: SW1-3 also sets DI5 &
DI6 and both HSCs (for 200uA or 2.2mA operation). 15 millisecond input filtering protects
against contact bounce.
1.3.3.3.2 Dedicated Non-isolated Digital Outputs (also see Section 2.3.4.4)
Terminal Block 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 FETs that sink 400 mA (Max.) at 30Vdc. The maximum output frequency is 20
Hz. Transorbs (30Vdc) provide surge suppression between each signal and ground.
Selectable DI/Os are discussed in section 1.3.3.3.3.
1.3.3.3.3 Selectable Non-isolated Digital Inputs/Outputs (also see Section 2.3.4.5)
Terminal Block TB3 also 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. These DI/Os are
rated identically to the DIs and DOs discussed in Sections 1.3.3.3.1 and 1.3.3.3.2.
1.3.3.3.4 Non-isolated Analog Inputs (also see Section 2.3.4.6)
Terminal Block 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
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