Invensys Triconex 3700A
All Analog Input Modules have three independent input channels. Each input channel receives variable voltage signals from each point, converts them to digital values, and transmits the values to the three Main Processors on demand. To ensure correct data for every scan, one value is selected using a mid-value selection algorithm. Sensing of each input point is performed in a manner that prevents a single failure on one channel from affecting another channel.
The 3700A, 3703E, and 3704E, 3720, and 3721 Analog Input Modules
provide a six percent over range measurement capability. The 3703E provides open-input detection, which can be configured as upscale or downscale in TriStation 1131.
If an open input (< 0 VDC) goes out of range downscale, the Main Processors receive the integer value –32,767. If an open input (> 5VDC or 10 VDC) goes out of range upscale, the Main Processors receive the integer value +32,767.
The 3720 and 3721 can be configured in TriStation 1131 for either Standard (12 bit) resolution or High (14 bit) resolution. In High resolution, the 3721 can be configured in TriStation 1131 for Unipolar (0 to 5 VDC) or Bipolar (-5 to +5 VDC) inputs.
Each Analog Input Module sustains complete, ongoing diagnostics for each channel. Failure of any diagnostic on any channel activates the Fault indicator for the module, which in turn activates the chassis alarm signal. The Fault 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 some multiple faults.
Analog Input Modules include the hot-spare feature which allows online replacement of a faulty module. Like all I/O modules, Analog Input 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.
3700A Analog Input Specifications
| Feature |
Specification |
| Color code |
Yellow |
| Number of input signals |
32 differential, DC-coupled |
| Input update rate |
55 ms |
| Resolution |
12 bits |
| Accuracy |
< 0.15% of FSR, from 0° to 60° C |
| Input resistance (load) |
30 MΩ (DC), minimum |
|
Input resistance @ power off
Common mode rejection (typical)
|
30 kΩ (DC), typical
-80 dB (DC - 100 Hz)
|
| Common mode range (See Warning) |
-12V to +12V peak |
| Channel-to-channel isolation |
200 kΩ, typical |
|
Normal mode rejection
|
-3 dB @ 8 Hz
-17 dB @ 60 Hz
-23 dB @ 120 Hz
|
| Input voltage range |
0 to 5V |
|
Input over-range measurement
(only for 3700A)
|
+6%, 0 to 5.3 VDC
|
| Logic power |
< 10 watts |
| Input over-range protection |
150 VDC continuous, 115 VAC continuous |
| Input current range |
0 to 20 mA with 250 Ω shunt resistor |
| Module status indicators |
Pass, Fault, Active |
|
Input diagnostic fault coverage1
Minimum input change
Input change sample period
Minimum period of mis-compares
|
2% of full scale
1 scan or 200 ms, whichever is greater
40 samples
|
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.
Global supplier of quality automation and control components.
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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