Honeywell ControlEdge 900 platform, Hardware Planning And Installation Manual, Page: 96 / 230

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Configurable failsafe behavior between failsafe value and hold last
value.
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Failsafe Value: A user-configurable failsafe value to allow
predictable in the event of communication between the module
and the controller is interrupted or controller exception stop.
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Hold Last value: AO channel hold last value when module is in
failsafe state.
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Minimum settable failsafe value is EU Ex Low.
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AO channel of a module be in failsafe will output 0mA when the
failsafe value is set as EU Ex Low, and open wire or EU Ex Low
error will not be triggered in this case.
Analog Output Module (8 Channels)
The Analog Output module provides eight 0 to 21.0 mA outputs .
Outputs are isolated in groups of four with no isolation between
outputs in a group. All points are isolated from controller logic.
A green blinking status LED on the module indicates when the
module is being scanned. A red status LED when module or channel
diagnostics exist. A user specified failsafe value is supported to allow
predictable operation in the event communication between the
module and the controller is interrupted. Outputs are updated
synchronous with control execution.
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Outputs per module: 8, isolated in 2 groups of 4 outputs (1-4, 5-8)
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Current: 0 to 21.0 mA, selectable options: 0-20 mA and 4-20 mA
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Load resistance: 750 ohms max
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Galvanic Isolation: 500VDC group to group. Groups 1-4, 5-8
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Galvanic Isolation from logic: 500 VDC
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Accuracy: 0.1% full scale at reference conditions
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Modules per rack: 4 max when powered from internal 24V
backplane power
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Minimum current sensing: >0.5mA per output
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Output Verification: Feedback to controller to indicate output
current is flowing.
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D/A Resolution: 13+ bits (1 part in 13332)
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Power Supply Loading: 5V; 225 mA max 24V; 350 mA max
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Terminal Block: 36 Position – Euro style, (Model 900TCK-0001)
A DIP switch on the module selects the use of 24V from Rack PS
(internal) power or external loop power via a separate 24V DC power
source. The as-shipped (default) switch setting is external power.
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