Emerson Fisher FLOBOSS 407, Instruction Manual

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FloBoss 407 Instruction Manual
3-4 Rev 5/00
3.2.2 Analog Input Source Module
The Analog Input Source (AI Source) module monitors current loop or voltage output devices. The
module provides a regulated 10-volt source for powering a device, usually a low power transmitter, and
uses a scaling resistor for converting loop current to input voltage.
3.2.3 Analog Output Source Module
The Analog Output Source (AO Source) module provides both a current and a voltage output for
powering analog devices. These outputs are isolated from each other and can be used simultaneously.
A scaling resistor is provided for setting the minimum loop resistance of the current loop to 0 ohms
(installed) or 220 ohms (removed).
3.2.4 Discrete Input Source and Isolated Modules
The Discrete Input Source (DI Source) and Discrete Input Isolated (DI Isolated) modules monitor the
status of relays, solid-state switches, or other two-state devices. Each module can accommodate one
discrete input.
Both types of modules provide an LED that lights when the input is active and use a scaling resistor for
scaling the input range. Functions supported by both modules are: discrete latched input, discrete
status input, and time-duration input.
The source module provides a source voltage for dry relay contacts or for an open-collector solid-state
switch. The isolated module accepts an external voltage from a powered two-state device and provides
electrical isolation from the ROC power supplies.
3.2.5 Discrete Output Source and Isolated Modules
The Discrete Output Source (DO Source) and Discrete Output Isolated (DO Isolated) modules provide
two-state outputs to energize relays and power small electrical loads. Each module provides one
discrete output.
Both types of modules use an LED to show the status of the output and are fused for protection against
excessive current. Functions supported by both modules are: sustained discrete output, momentary
discrete output, slow pulse-train output, and time-duration discrete output.
The source module supplies switched current-limited power to small loads. The isolated module acts as
a solid-state normally-open switch for activating externally powered devices. The solid-state switch is
optically isolated from the power supplies in the ROC/FloBoss.