Invensys Triconex 3805E
Analog Output Modules receive output signals from the Main Processors on each of three channels. Each set of data is voted, and a healthy channel is selected to drive the outputs. The module monitors its own current outputs (as input voltages) and maintains an internal voltage reference that provides self-calibration and module health information.
Each channel on the analog output module has two independent current loopback circuits per point that are readable by the other channels. The information from these circuits is used as part of the hardware voting process. The first circuit verifies the accuracy and presence of the analog signal for each point, independent of the load presence or channel selection. The second circuit verifies the actual current flow for each point from the selected channel. If a current flow is detected from any point on a non-selected channel, that channel is immediately shutdown. The Load alarm status indicator is annunciated if the module cannot drive current from any point—for example, open load.
Analog Output Modules provide for the connection of redundant field loop power sources with individual indicators on the module called Pwr1 and Pwr2. Field loop power supplies for analog outputs must be provided externally. Connection of the field loop power supplies is made on the termination panel. A Status indicator activates if an open loop is detected on one or more output points. The Pwr1 and Pwr2 indicators are On if loop power is present.
Each module sustains complete and ongoing diagnostics for each channel. Failure of any diagnostic test on any channel activates the module Fault status indicator and the chassis alarm signal. The Fault status indicator points to a channel fault, not a module failure. The module is guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.
Analog Output Modules include the hot-spare feature which allows online replacement of a faulty module. Like all I/O modules, Analog Output Modules require a separate field termination assembly with a cable interface to the Tricon controller backplane. Each module is mechanically keyed to prevent improper installation in a configured chassis.
3805E Analog Output Specifications
| Feature |
Specification |
| Color code |
Pea green |
| Number of output points |
8, output, commoned return, DC-coupled |
| Resolution |
12 bits |
| Output current range |
4–20 mA (+6% over-range) |
| Output over-range capability |
2–21.2 mA |
| Output accuracy |
< 0.25% (in range of 4–20 mA) of
FSR (0–21.2 mA), from 0° to 60° C
|
|
External loop power (reverse voltage protected)
|
+42.5 VDC maximum
+24 VDC nominal
|
| Output loop power requirement: load |
Required |
| Output loop power requirement: 250 Ω load |
> 20V (1 A minimum) |
| Output loop power requirement: 500 Ω load |
> 25V (1 A minimum) |
| Output loop power requirement: 750 Ω load |
> 30V (1 A minimum) |
| Output loop power requirement: 1000 Ωload |
> 35V (1 A minimum) |
| Output over-range protection |
+42.5 VDC continuous, 0 VDC continuous |
| Switch time on channel failure |
10 ms (typical), 20 ms (maximum) |
| Status indicator: Module status |
Pass, Fault, Active, Load |
| Status indicator: Loop power status1 |
Pwr1, Pwr2 |
|
Output diagnostic fault coverage:
Minimum input change
Output change sample period
Minimum period of mis-compares
|
Not applicable
Not applicable
Not applicable
|
| Logic power |
< 15 watts |
100% brand new and original,All the goods will be tested before shipment.
For the in stock items, we will send the order out within 5-7 days after receive the payment.
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Topteng offers a 12-month warranty from the date of delivery.
In the event of non-conforming product ( if damaged or incorrect product is received ),
Any nonconformity must be reported within 7 days of receipt of goods.
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